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<?xml version="1.0"?>
<doc>
    <assembly>
        <name>DotNetZip</name>
    </assembly>
    <members>
        <member name="P:Ionic.BZip2.BitWriter.RemainingBits">
            <summary>
              Delivers the remaining bits, left-aligned, in a byte.
            </summary>
            <remarks>
              <para>
                This is valid only if NumRemainingBits is less than 8;
                in other words it is valid only after a call to Flush().
              </para>
            </remarks>
        </member>
        <member name="M:Ionic.BZip2.BitWriter.Reset">
            <summary>
              Reset the BitWriter.
            </summary>
            <remarks>
              <para>
                This is useful when the BitWriter writes into a MemoryStream, and
                is used by a BZip2Compressor, which itself is re-used for multiple
                distinct data blocks.
              </para>
            </remarks>
        </member>
        <member name="M:Ionic.BZip2.BitWriter.WriteBits(System.Int32,System.UInt32)">
            <summary>
              Write some number of bits from the given value, into the output.
            </summary>
            <remarks>
              <para>
                The nbits value should be a max of 25, for safety. For performance
                reasons, this method does not check!
              </para>
            </remarks>
        </member>
        <member name="M:Ionic.BZip2.BitWriter.WriteByte(System.Byte)">
            <summary>
              Write a full 8-bit byte into the output.
            </summary>
        </member>
        <member name="M:Ionic.BZip2.BitWriter.WriteInt(System.UInt32)">
            <summary>
              Write four 8-bit bytes into the output.
            </summary>
        </member>
        <member name="M:Ionic.BZip2.BitWriter.Flush">
            <summary>
              Write all available byte-aligned bytes.
            </summary>
            <remarks>
              <para>
                This method writes no new output, but flushes any accumulated
                bits. At completion, the accumulator may contain up to 7
                bits.
              </para>
              <para>
                This is necessary when re-assembling output from N independent
                compressors, one for each of N blocks. The output of any
                particular compressor will in general have some fragment of a byte
                remaining. This fragment needs to be accumulated into the
                parent BZip2OutputStream.
              </para>
            </remarks>
        </member>
        <member name="M:Ionic.BZip2.BitWriter.FinishAndPad">
            <summary>
              Writes all available bytes, and emits padding for the final byte as
              necessary. This must be the last method invoked on an instance of
              BitWriter.
            </summary>
        </member>
        <member name="F:Ionic.BZip2.BZip2Compressor.increments">
            Knuth's increments seem to work better than Incerpi-Sedgewick here. Possibly because the number of elems to sort is usually small, typically &lt;= 20. </member> <member name="M:Ionic.BZip2.BZip2Compressor.#ctor(Ionic.BZip2.BitWriter)"> <summary> BZip2Compressor writes its compressed data out via a BitWriter. This is necessary because BZip2 does byte shredding. </summary> </member> <member name="P:Ionic.BZip2.BZip2Compressor.UncompressedBytes"> <summary> The number of uncompressed bytes being held in the buffer. </summary> <remarks> <para> I am thinking this may be useful in a Stream that uses this compressor class. In the Close() method on the stream it could check this value to see if anything has been written at all. You may think the stream could easily track the number of bytes it wrote, which would eliminate the need for this. But, there is the case where the stream writes a complete block, and it is full, and then writes no more. In that case the stream may want to check. </para> </remarks> </member> <member name="M:Ionic.BZip2.BZip2Compressor.Fill(System.Byte[],System.Int32,System.Int32)"> <summary> Accept new bytes into the compressor data buffer </summary> <remarks> <para> This method does the first-level (cheap) run-length encoding, and stores the encoded data into the rle block. </para> </remarks> </member> <member name="M:Ionic.BZip2.BZip2Compressor.write0(System.Byte)"> <summary> Process one input byte into the block. </summary> <remarks> <para> To "process" the byte means to do the run-length encoding. There are 3 possible return values: 0 - the byte was not written, in other words, not encoded into the block. This happens when the byte b would require the start of a new run, and the block has no more room for new runs. 1 - the byte was written, and the block is not full. 2 - the byte was written, and the block is full. </para> </remarks> <returns>0 if the byte was not written, non-zero if written.</returns> </member> <member name="M:Ionic.BZip2.BZip2Compressor.AddRunToOutputBlock(System.Boolean)"> <summary> Append one run to the output block. </summary> <remarks> <para> This compressor does run-length-encoding before BWT and etc. This method simply appends a run to the output block. The append always succeeds. The return value indicates whether the block is full: false (not full) implies that at least one additional run could be processed. </para> </remarks> <returns>true if the block is now full; otherwise false.</returns> </member> <member name="M:Ionic.BZip2.BZip2Compressor.CompressAndWrite"> <summary> Compress the data that has been placed (Run-length-encoded) into the block. The compressed data goes into the CompressedBytes array. </summary> <remarks> <para> Side effects: 1. fills the CompressedBytes array. 2. sets the AvailableBytesOut property. </para> </remarks> </member> <member name="M:Ionic.BZip2.BZip2Compressor.mainSimpleSort(Ionic.BZip2.BZip2Compressor.CompressionState,System.Int32,System.Int32,System.Int32)"> This is the most hammered method of this class. <p> This is the version using unrolled loops. </p> </member> <member name="M:Ionic.BZip2.BZip2Compressor.mainQSort3(Ionic.BZip2.BZip2Compressor.CompressionState,System.Int32,System.Int32,System.Int32)"> Method "mainQSort3", file "blocksort.c", BZip2 1.0.2 </member> <member name="F:Ionic.BZip2.BZip2Compressor.CompressionState.quadrant"> Array instance identical to sfmap, both are used only temporarily and independently, so we do not need to allocate additional memory. </member> <member name="T:Ionic.BZip2.BZip2InputStream"> <summary> A read-only decorator stream that performs BZip2 decompression on Read. </summary> </member> <member name="T:Ionic.BZip2.BZip2InputStream.CState"> <summary> Compressor State </summary> </member> <member name="M:Ionic.BZip2.BZip2InputStream.#ctor(System.IO.Stream)"> <summary> Create a BZip2InputStream, wrapping it around the given input Stream. </summary> <remarks> <para> The input stream will be closed when the BZip2InputStream is closed. </para> </remarks> <param name='input'>The stream from which to read compressed data</param> </member> <member name="M:Ionic.BZip2.BZip2InputStream.#ctor(System.IO.Stream,System.Boolean)"> <summary> Create a BZip2InputStream with the given stream, and specifying whether to leave the wrapped stream open when the BZip2InputStream is closed. </summary> <param name='input'>The stream from which to read compressed data</param> <param name='leaveOpen'> Whether to leave the input stream open, when the BZip2InputStream closes. </param> <example> This example reads a bzip2-compressed file, decompresses it, and writes the decompressed data into a newly created file. <code> var fname = "logfile.log.bz2"; using (var fs = File.OpenRead(fname)) { using (var decompressor = new Ionic.BZip2.BZip2InputStream(fs)) { var outFname = fname + ".decompressed"; using (var output = File.Create(outFname)) { byte[] buffer = new byte[2048]; int n; while ((n = decompressor.Read(buffer, 0, buffer.Length)) > 0) { output.Write(buffer, 0, n); } } } } </code> </example> </member> <member name="M:Ionic.BZip2.BZip2InputStream.Read(System.Byte[],System.Int32,System.Int32)"> <summary> Read data from the stream. </summary> <remarks> <para> To decompress a BZip2 data stream, create a <c>BZip2InputStream</c>, providing a stream that reads compressed data. Then call Read() on that <c>BZip2InputStream</c>, and the data read will be decompressed as you read. </para> <para> A <c>BZip2InputStream</c> can be used only for <c>Read()</c>, not for <c>Write()</c>. </para> </remarks> <param name="buffer">The buffer into which the read data should be placed.</param> <param name="offset">the offset within that data array to put the first byte read.</param> <param name="count">the number of bytes to read.</param> <returns>the number of bytes actually read</returns> </member> <member name="M:Ionic.BZip2.BZip2InputStream.ReadByte"> <summary> Read a single byte from the stream. </summary> <returns>the byte read from the stream, or -1 if EOF</returns> </member> <member name="P:Ionic.BZip2.BZip2InputStream.CanRead"> <summary> Indicates whether the stream can be read. </summary> <remarks> The return value depends on whether the captive stream supports reading. </remarks> </member> <member name="P:Ionic.BZip2.BZip2InputStream.CanSeek"> <summary> Indicates whether the stream supports Seek operations. </summary> <remarks> Always returns false. </remarks> </member> <member name="P:Ionic.BZip2.BZip2InputStream.CanWrite"> <summary> Indicates whether the stream can be written. </summary> <remarks> The return value depends on whether the captive stream supports writing. </remarks> </member> <member name="M:Ionic.BZip2.BZip2InputStream.Flush"> <summary> Flush the stream. </summary> </member> <member name="P:Ionic.BZip2.BZip2InputStream.Length"> <summary> Reading this property always throws a <see cref="T:System.NotImplementedException"/>. </summary> </member> <member name="P:Ionic.BZip2.BZip2InputStream.Position"> <summary> The position of the stream pointer. </summary> <remarks> Setting this property always throws a <see cref="T:System.NotImplementedException"/>. Reading will return the total number of uncompressed bytes read in. </remarks> </member> <member name="M:Ionic.BZip2.BZip2InputStream.Seek(System.Int64,System.IO.SeekOrigin)"> <summary> Calling this method always throws a <see cref="T:System.NotImplementedException"/>. </summary> <param name="offset">this is irrelevant, since it will always throw!</param> <param name="origin">this is irrelevant, since it will always throw!</param> <returns>irrelevant!</returns> </member> <member name="M:Ionic.BZip2.BZip2InputStream.SetLength(System.Int64)"> <summary> Calling this method always throws a <see cref="T:System.NotImplementedException"/>. </summary> <param name="value">this is irrelevant, since it will always throw!</param> </member> <member name="M:Ionic.BZip2.BZip2InputStream.Write(System.Byte[],System.Int32,System.Int32)"> <summary> Calling this method always throws a <see cref="T:System.NotImplementedException"/>. </summary> <param name='buffer'>this parameter is never used</param> <param name='offset'>this parameter is never used</param> <param name='count'>this parameter is never used</param> </member> <member name="M:Ionic.BZip2.BZip2InputStream.Dispose(System.Boolean)"> <summary> Dispose the stream. </summary> <param name="disposing"> indicates whether the Dispose method was invoked by user code. </param> </member> <member name="M:Ionic.BZip2.BZip2InputStream.Close"> <summary> Close the stream. </summary> </member> <member name="M:Ionic.BZip2.BZip2InputStream.GetBits(System.Int32)"> <summary> Read n bits from input, right justifying the result. </summary> <remarks> <para> For example, if you read 1 bit, the result is either 0 or 1. </para> </remarks> <param name ="n"> The number of bits to read, always between 1 and 32. </param> </member> <member name="M:Ionic.BZip2.BZip2InputStream.hbCreateDecodeTables(System.Int32[],System.Int32[],System.Int32[],System.Char[],System.Int32,System.Int32,System.Int32)"> Called by createHuffmanDecodingTables() exclusively. </member> <member name="M:Ionic.BZip2.BZip2InputStream.createHuffmanDecodingTables(System.Int32,System.Int32)"> Called by recvDecodingTables() exclusively. </member> <member name="F:Ionic.BZip2.BZip2InputStream.DecompressionState.unzftab"> Freq table collected to save a pass over the data during decompression. </member> <member name="M:Ionic.BZip2.BZip2InputStream.DecompressionState.initTT(System.Int32)"> Initializes the tt array. This method is called when the required length of the array is known. I don't initialize it at construction time to avoid unneccessary
             memory allocation when compressing small files.
        </member>
        <member name="T:Ionic.BZip2.BZip2OutputStream">
            <summary>
              A write-only decorator stream that compresses data as it is
              written using the BZip2 algorithm.
            </summary>
        </member>
        <member name="M:Ionic.BZip2.BZip2OutputStream.#ctor(System.IO.Stream)">
             <summary>
               Constructs a new <c>BZip2OutputStream</c>, that sends its
               compressed output to the given output stream.
             </summary>
            
             <param name='output'>
               The destination stream, to which compressed output will be sent.
             </param>
            
             <example>
            
               This example reads a file, then compresses it with bzip2 file,
               and writes the compressed data into a newly created file.
            
               <code>
               var fname = "logfile.log";
               using (var fs = File.OpenRead(fname))
               {
                   var outFname = fname + ".bz2";
                   using (var output = File.Create(outFname))
                   {
                       using (var compressor = new Ionic.BZip2.BZip2OutputStream(output))
                       {
                           byte[] buffer = new byte[2048];
                           int n;
                           while ((n = fs.Read(buffer, 0, buffer.Length)) > 0)
                           {
                               compressor.Write(buffer, 0, n);
                           }
                       }
                   }
               }
               </code>
             </example>
        </member>
        <member name="M:Ionic.BZip2.BZip2OutputStream.#ctor(System.IO.Stream,System.Int32)">
            <summary>
              Constructs a new <c>BZip2OutputStream</c> with specified blocksize.
            </summary>
            <param name = "output">the destination stream.</param>
            <param name = "blockSize">
              The blockSize in units of 100000 bytes.
              The valid range is 1..9.
            </param>
        </member>
        <member name="M:Ionic.BZip2.BZip2OutputStream.#ctor(System.IO.Stream,System.Boolean)">
            <summary>
              Constructs a new <c>BZip2OutputStream</c>.
            </summary>
              <param name = "output">the destination stream.</param>
            <param name = "leaveOpen">
              whether to leave the captive stream open upon closing this stream.
            </param>
        </member>
        <member name="M:Ionic.BZip2.BZip2OutputStream.#ctor(System.IO.Stream,System.Int32,System.Boolean)">
             <summary>
               Constructs a new <c>BZip2OutputStream</c> with specified blocksize,
               and explicitly specifies whether to leave the wrapped stream open.
             </summary>
            
             <param name = "output">the destination stream.</param>
             <param name = "blockSize">
               The blockSize in units of 100000 bytes.
               The valid range is 1..9.
             </param>
             <param name = "leaveOpen">
               whether to leave the captive stream open upon closing this stream.
             </param>
        </member>
        <member name="M:Ionic.BZip2.BZip2OutputStream.Close">
            <summary>
              Close the stream.
            </summary>
            <remarks>
              <para>
                This may or may not close the underlying stream.  Check the
                constructors that accept a bool value.
              </para>
            </remarks>
        </member>
        <member name="M:Ionic.BZip2.BZip2OutputStream.Flush">
            <summary>
              Flush the stream.
            </summary>
        </member>
        <member name="P:Ionic.BZip2.BZip2OutputStream.BlockSize">
            <summary>
              The blocksize parameter specified at construction time.
            </summary>
        </member>
        <member name="M:Ionic.BZip2.BZip2OutputStream.Write(System.Byte[],System.Int32,System.Int32)">
             <summary>
               Write data to the stream.
             </summary>
             <remarks>
            
             <para>
               Use the <c>BZip2OutputStream</c> to compress data while writing:
               create a <c>BZip2OutputStream</c> with a writable output stream.
               Then call <c>Write()</c> on that <c>BZip2OutputStream</c>, providing
               uncompressed data as input.  The data sent to the output stream will
               be the compressed form of the input data.
             </para>
            
             <para>
               A <c>BZip2OutputStream</c> can be used only for <c>Write()</c> not for <c>Read()</c>.
             </para>
            
             </remarks>
            
             <param name="buffer">The buffer holding data to write to the stream.</param>
             <param name="offset">the offset within that data array to find the first byte to write.</param>
             <param name="count">the number of bytes to write.</param>
        </member>
        <member name="P:Ionic.BZip2.BZip2OutputStream.CanRead">
            <summary>
            Indicates whether the stream can be read.
            </summary>
            <remarks>
            The return value is always false.
            </remarks>
        </member>
        <member name="P:Ionic.BZip2.BZip2OutputStream.CanSeek">
            <summary>
            Indicates whether the stream supports Seek operations.
            </summary>
            <remarks>
            Always returns false.
            </remarks>
        </member>
        <member name="P:Ionic.BZip2.BZip2OutputStream.CanWrite">
            <summary>
            Indicates whether the stream can be written.
            </summary>
            <remarks>
            The return value should always be true, unless and until the
            object is disposed and closed.
            </remarks>
        </member>
        <member name="P:Ionic.BZip2.BZip2OutputStream.Length">
            <summary>
            Reading this property always throws a <see cref="T:System.NotImplementedException"/>.
            </summary>
        </member>
        <member name="P:Ionic.BZip2.BZip2OutputStream.Position">
             <summary>
             The position of the stream pointer.
             </summary>
            
             <remarks>
               Setting this property always throws a <see
               cref="T:System.NotImplementedException"/>. Reading will return the
               total number of uncompressed bytes written through.
             </remarks>
        </member>
        <member name="M:Ionic.BZip2.BZip2OutputStream.Seek(System.Int64,System.IO.SeekOrigin)">
            <summary>
            Calling this method always throws a <see cref="T:System.NotImplementedException"/>.
            </summary>
            <param name="offset">this is irrelevant, since it will always throw!</param>
            <param name="origin">this is irrelevant, since it will always throw!</param>
            <returns>irrelevant!</returns>
        </member>
        <member name="M:Ionic.BZip2.BZip2OutputStream.SetLength(System.Int64)">
            <summary>
            Calling this method always throws a <see cref="T:System.NotImplementedException"/>.
            </summary>
            <param name="value">this is irrelevant, since it will always throw!</param>
        </member>
        <member name="M:Ionic.BZip2.BZip2OutputStream.Read(System.Byte[],System.Int32,System.Int32)">
            <summary>
              Calling this method always throws a <see cref="T:System.NotImplementedException"/>.
            </summary>
            <param name='buffer'>this parameter is never used</param>
            <param name='offset'>this parameter is never used</param>
            <param name='count'>this parameter is never used</param>
            <returns>never returns anything; always throws</returns>
        </member>
        <member name="T:Ionic.BZip2.ParallelBZip2OutputStream">
             <summary>
               A write-only decorator stream that compresses data as it is
               written using the BZip2 algorithm. This stream compresses by
               block using multiple threads.
             </summary>
             <para>
               This class performs BZIP2 compression through writing.  For
               more information on the BZIP2 algorithm, see
               <see href="http://en.wikipedia.org/wiki/BZIP2"/>.
             </para>
            
             <para>
               This class is similar to <see cref="T:Ionic.BZip2.BZip2OutputStream"/>,
               except that this implementation uses an approach that employs multiple
               worker threads to perform the compression.  On a multi-cpu or multi-core
               computer, the performance of this class can be significantly higher than
               the single-threaded BZip2OutputStream, particularly for larger streams.
               How large?  Anything over 10mb is a good candidate for parallel
               compression.
             </para>
            
             <para>
               The tradeoff is that this class uses more memory and more CPU than the
               vanilla <c>BZip2OutputStream</c>. Also, for small files, the
               <c>ParallelBZip2OutputStream</c> can be much slower than the vanilla
               <c>BZip2OutputStream</c>, because of the overhead associated to using the
               thread pool.
             </para>
            
             <seealso cref="T:Ionic.BZip2.BZip2OutputStream" />
        </member>
        <member name="M:Ionic.BZip2.ParallelBZip2OutputStream.#ctor(System.IO.Stream)">
             <summary>
               Constructs a new <c>ParallelBZip2OutputStream</c>, that sends its
               compressed output to the given output stream.
             </summary>
            
             <param name='output'>
               The destination stream, to which compressed output will be sent.
             </param>
            
             <example>
            
               This example reads a file, then compresses it with bzip2 file,
               and writes the compressed data into a newly created file.
            
               <code>
               var fname = "logfile.log";
               using (var fs = File.OpenRead(fname))
               {
                   var outFname = fname + ".bz2";
                   using (var output = File.Create(outFname))
                   {
                       using (var compressor = new Ionic.BZip2.ParallelBZip2OutputStream(output))
                       {
                           byte[] buffer = new byte[2048];
                           int n;
                           while ((n = fs.Read(buffer, 0, buffer.Length)) > 0)
                           {
                               compressor.Write(buffer, 0, n);
                           }
                       }
                   }
               }
               </code>
             </example>
        </member>
        <member name="M:Ionic.BZip2.ParallelBZip2OutputStream.#ctor(System.IO.Stream,System.Int32)">
            <summary>
              Constructs a new <c>ParallelBZip2OutputStream</c> with specified blocksize.
            </summary>
            <param name = "output">the destination stream.</param>
            <param name = "blockSize">
              The blockSize in units of 100000 bytes.
              The valid range is 1..9.
            </param>
        </member>
        <member name="M:Ionic.BZip2.ParallelBZip2OutputStream.#ctor(System.IO.Stream,System.Boolean)">
            <summary>
              Constructs a new <c>ParallelBZip2OutputStream</c>.
            </summary>
              <param name = "output">the destination stream.</param>
            <param name = "leaveOpen">
              whether to leave the captive stream open upon closing this stream.
            </param>
        </member>
        <member name="M:Ionic.BZip2.ParallelBZip2OutputStream.#ctor(System.IO.Stream,System.Int32,System.Boolean)">
             <summary>
               Constructs a new <c>ParallelBZip2OutputStream</c> with specified blocksize,
               and explicitly specifies whether to leave the wrapped stream open.
             </summary>
            
             <param name = "output">the destination stream.</param>
             <param name = "blockSize">
               The blockSize in units of 100000 bytes.
               The valid range is 1..9.
             </param>
             <param name = "leaveOpen">
               whether to leave the captive stream open upon closing this stream.
             </param>
        </member>
        <member name="P:Ionic.BZip2.ParallelBZip2OutputStream.MaxWorkers">
             <summary>
               The maximum number of concurrent compression worker threads to use.
             </summary>
            
             <remarks>
             <para>
               This property sets an upper limit on the number of concurrent worker
               threads to employ for compression. The implementation of this stream
               employs multiple threads from the .NET thread pool, via <see
               cref="M:System.Threading.ThreadPool.QueueUserWorkItem(System.Threading.WaitCallback)">
               ThreadPool.QueueUserWorkItem()</see>, to compress the incoming data by
               block.  As each block of data is compressed, this stream re-orders the
               compressed blocks and writes them to the output stream.
             </para>
            
             <para>
               A higher number of workers enables a higher degree of
               parallelism, which tends to increase the speed of compression on
               multi-cpu computers.  On the other hand, a higher number of buffer
               pairs also implies a larger memory consumption, more active worker
               threads, and a higher cpu utilization for any compression. This
               property enables the application to limit its memory consumption and
               CPU utilization behavior depending on requirements.
             </para>
            
             <para>
               By default, DotNetZip allocates 4 workers per CPU core, subject to the
               upper limit specified in this property. For example, suppose the
               application sets this property to 16.  Then, on a machine with 2
               cores, DotNetZip will use 8 workers; that number does not exceed the
               upper limit specified by this property, so the actual number of
               workers used will be 4 * 2 = 8.  On a machine with 4 cores, DotNetZip
               will use 16 workers; again, the limit does not apply. On a machine
               with 8 cores, DotNetZip will use 16 workers, because of the limit.
             </para>
            
             <para>
               For each compression "worker thread" that occurs in parallel, there is
               up to 2mb of memory allocated, for buffering and processing. The
               actual number depends on the <see cref="P:Ionic.BZip2.ParallelBZip2OutputStream.BlockSize"/> property.
             </para>
            
             <para>
               CPU utilization will also go up with additional workers, because a
               larger number of buffer pairs allows a larger number of background
               threads to compress in parallel. If you find that parallel
               compression is consuming too much memory or CPU, you can adjust this
               value downward.
             </para>
            
             <para>
               The default value is 16. Different values may deliver better or
               worse results, depending on your priorities and the dynamic
               performance characteristics of your storage and compute resources.
             </para>
            
             <para>
               The application can set this value at any time, but it is effective
               only before the first call to Write(), which is when the buffers are
               allocated.
             </para>
             </remarks>
        </member>
        <member name="M:Ionic.BZip2.ParallelBZip2OutputStream.Close">
            <summary>
              Close the stream.
            </summary>
            <remarks>
              <para>
                This may or may not close the underlying stream.  Check the
                constructors that accept a bool value.
              </para>
            </remarks>
        </member>
        <member name="M:Ionic.BZip2.ParallelBZip2OutputStream.Flush">
            <summary>
              Flush the stream.
            </summary>
        </member>
        <member name="P:Ionic.BZip2.ParallelBZip2OutputStream.BlockSize">
            <summary>
              The blocksize parameter specified at construction time.
            </summary>
        </member>
        <member name="M:Ionic.BZip2.ParallelBZip2OutputStream.Write(System.Byte[],System.Int32,System.Int32)">
             <summary>
               Write data to the stream.
             </summary>
             <remarks>
            
             <para>
               Use the <c>ParallelBZip2OutputStream</c> to compress data while
               writing: create a <c>ParallelBZip2OutputStream</c> with a writable
               output stream.  Then call <c>Write()</c> on that
               <c>ParallelBZip2OutputStream</c>, providing uncompressed data as
               input.  The data sent to the output stream will be the compressed
               form of the input data.
             </para>
            
             <para>
               A <c>ParallelBZip2OutputStream</c> can be used only for
               <c>Write()</c> not for <c>Read()</c>.
             </para>
            
             </remarks>
            
             <param name="buffer">The buffer holding data to write to the stream.</param>
             <param name="offset">the offset within that data array to find the first byte to write.</param>
             <param name="count">the number of bytes to write.</param>
        </member>
        <member name="P:Ionic.BZip2.ParallelBZip2OutputStream.CanRead">
            <summary>
            Indicates whether the stream can be read.
            </summary>
            <remarks>
            The return value is always false.
            </remarks>
        </member>
        <member name="P:Ionic.BZip2.ParallelBZip2OutputStream.CanSeek">
            <summary>
            Indicates whether the stream supports Seek operations.
            </summary>
            <remarks>
            Always returns false.
            </remarks>
        </member>
        <member name="P:Ionic.BZip2.ParallelBZip2OutputStream.CanWrite">
            <summary>
            Indicates whether the stream can be written.
            </summary>
            <remarks>
            The return value depends on whether the captive stream supports writing.
            </remarks>
        </member>
        <member name="P:Ionic.BZip2.ParallelBZip2OutputStream.Length">
            <summary>
            Reading this property always throws a <see cref="T:System.NotImplementedException"/>.
            </summary>
        </member>
        <member name="P:Ionic.BZip2.ParallelBZip2OutputStream.Position">
             <summary>
             The position of the stream pointer.
             </summary>
            
             <remarks>
               Setting this property always throws a <see
               cref="T:System.NotImplementedException"/>. Reading will return the
               total number of uncompressed bytes written through.
             </remarks>
        </member>
        <member name="P:Ionic.BZip2.ParallelBZip2OutputStream.BytesWrittenOut">
            <summary>
            The total number of bytes written out by the stream.
            </summary>
            <remarks>
            This value is meaningful only after a call to Close().
            </remarks>
        </member>
        <member name="M:Ionic.BZip2.ParallelBZip2OutputStream.Seek(System.Int64,System.IO.SeekOrigin)">
            <summary>
            Calling this method always throws a <see cref="T:System.NotImplementedException"/>.
            </summary>
            <param name="offset">this is irrelevant, since it will always throw!</param>
            <param name="origin">this is irrelevant, since it will always throw!</param>
            <returns>irrelevant!</returns>
        </member>
        <member name="M:Ionic.BZip2.ParallelBZip2OutputStream.SetLength(System.Int64)">
            <summary>
            Calling this method always throws a <see cref="T:System.NotImplementedException"/>.
            </summary>
            <param name="value">this is irrelevant, since it will always throw!</param>
        </member>
        <member name="M:Ionic.BZip2.ParallelBZip2OutputStream.Read(System.Byte[],System.Int32,System.Int32)">
            <summary>
            Calling this method always throws a <see cref="T:System.NotImplementedException"/>.
            </summary>
            <param name='buffer'>this parameter is never used</param>
            <param name='offset'>this parameter is never used</param>
            <param name='count'>this parameter is never used</param>
            <returns>never returns anything; always throws</returns>
        </member>
        <member name="M:Ionic.BZip2.Rand.Rnums(System.Int32)">
            <summary>
              Returns the "random" number at a specific index.
            </summary>
            <param name='i'>the index</param>
            <returns>the random number</returns>
        </member>
        <member name="T:Ionic.Zip.SelfExtractorFlavor">
            <summary>
            An enum that provides the different self-extractor flavors
            </summary>
        </member>
        <member name="F:Ionic.Zip.SelfExtractorFlavor.ConsoleApplication">
            <summary>
            A self-extracting zip archive that runs from the console or
            command line.
            </summary>
        </member>
        <member name="F:Ionic.Zip.SelfExtractorFlavor.WinFormsApplication">
            <summary>
            A self-extracting zip archive that presents a graphical user
            interface when it is executed.
            </summary>
        </member>
        <member name="T:Ionic.Zip.SelfExtractorSaveOptions">
            <summary>
            The options for generating a self-extracting archive.
            </summary>
        </member>
        <member name="P:Ionic.Zip.SelfExtractorSaveOptions.Flavor">
            <summary>
              The type of SFX to create.
            </summary>
        </member>
        <member name="P:Ionic.Zip.SelfExtractorSaveOptions.PostExtractCommandLine">
             <summary>
               The command to run after extraction.
             </summary>
            
             <remarks>
             <para>
               This is optional. Leave it empty (<c>null</c> in C# or <c>Nothing</c> in
               VB) to run no command after extraction.
             </para>
            
             <para>
               If it is non-empty, the SFX will execute the command specified in this
               string on the user's machine, and using the extract directory as the working directory for the process, after unpacking the archive. The program to execute can include a path, if you like. If you want to execute a program that accepts arguments, specify the program name, followed by a space, and then the arguments for the program, each separated by a space, just as you would on a normal command line. Example: <c>program.exe arg1 arg2</c>. The string prior to the first space will be taken as the program name, and the string following the first space specifies the arguments to the program. </para> <para> If you want to execute a program that has a space in the name or path of the file, surround the program name in double-quotes. The first character of the command line should be a double-quote character, and there must be a matching double-quote following the end of the program file name. Any optional arguments to the program follow that, separated by spaces. Example: <c>"c:\project files\program name.exe" arg1 arg2</c>. </para> <para> If the flavor of the SFX is <c>SelfExtractorFlavor.ConsoleApplication</c>, then the SFX starts a new process, using this string as the post-extract command line. The SFX waits for the process to exit. The exit code of the post-extract command line is returned as the exit code of the command-line self-extractor exe. A non-zero exit code is typically used to indicated a failure by the program. In the case of an SFX, a non-zero exit code may indicate a failure during extraction, OR, it may indicate a failure of the run-after-extract program if specified, OR, it may indicate the run-after-extract program could not be fuond. There is no way to distinguish these conditions from the calling shell, aside from parsing the output of the SFX. If you have Quiet set to <c>true</c>, you may not see error messages, if a problem occurs. </para> <para> If the flavor of the SFX is <c>SelfExtractorFlavor.WinFormsApplication</c>, then the SFX starts a new process, using this string as the post-extract command line, and using the extract directory as the working directory for the process. The SFX does not wait for the command to complete, and does not check the exit code of the program. If the run-after-extract program cannot be fuond, a message box is displayed indicating that fact. </para> <para> You can specify environment variables within this string, with a format like <c>%NAME%</c>. The value of these variables will be expanded at the time the SFX is run. Example: <c>%WINDIR%\system32\xcopy.exe</c> may expand at runtime to <c>c:\Windows\System32\xcopy.exe</c>. </para> <para> By combining this with the <c>RemoveUnpackedFilesAfterExecute</c> flag, you can create an SFX that extracts itself, runs a file that was extracted, then deletes all the files that were extracted. If you want it to run "invisibly" then set <c>Flavor</c> to <c>SelfExtractorFlavor.ConsoleApplication</c>, and set <c>Quiet</c> to true. The user running such an EXE will see a console window appear, then disappear quickly. You may also want to specify the default extract location, with <c>DefaultExtractDirectory</c>. </para> <para> If you set <c>Flavor</c> to <c>SelfExtractorFlavor.WinFormsApplication</c>, and set <c>Quiet</c> to true, then a GUI with progressbars is displayed, but it is "non-interactive" - it accepts no input from the user. Instead the SFX just automatically unpacks and exits. </para> </remarks> </member> <member name="P:Ionic.Zip.SelfExtractorSaveOptions.DefaultExtractDirectory"> <summary> The default extract directory the user will see when running the self-extracting archive. </summary> <remarks> <para> Passing null (or Nothing in VB) here will cause the Self Extractor to use the the user's personal directory (<see
               cref="F:System.Environment.SpecialFolder.Personal"/>) for the default extract
               location.
             </para>
            
             <para>
               This is only a default location.  The actual extract location will be
               settable on the command line when the SFX is executed.
             </para>
            
             <para>
               You can specify environment variables within this string,
               with <c>%NAME%</c>. The value of these variables will be
               expanded at the time the SFX is run. Example:
               <c>%USERPROFILE%\Documents\unpack</c> may expand at runtime to
               <c>c:\users\melvin\Documents\unpack</c>.
             </para>
             </remarks>
        </member>
        <member name="P:Ionic.Zip.SelfExtractorSaveOptions.IconFile">
             <summary>
               The name of an .ico file in the filesystem to use for the application icon
               for the generated SFX.
             </summary>
            
             <remarks>
             <para>
               Normally, DotNetZip will embed an "zipped folder" icon into the generated
               SFX.  If you prefer to use a different icon, you can specify it here. It
               should be a .ico file.  This file is passed as the <c>/win32icon</c>
               option to the csc.exe compiler when constructing the SFX file.
             </para>
             </remarks>
            
        </member>
        <member name="P:Ionic.Zip.SelfExtractorSaveOptions.Quiet">
             <summary>
               Whether the ConsoleApplication SFX will be quiet during extraction.
             </summary>
            
             <remarks>
             <para>
               This option affects the way the generated SFX runs. By default it is
               false.  When you set it to true,...
             </para>
            
             <list type="table">
               <listheader>
                 <term>Flavor</term>
                 <description>Behavior</description>
               </listheader>
            
             <item>
               <term><c>ConsoleApplication</c></term>
               <description><para>no messages will be emitted during successful
                 operation.</para> <para> Double-clicking the SFX in Windows
                 Explorer or as an attachment in an email will cause a console
                 window to appear briefly, before it disappears. If you run the
                 ConsoleApplication SFX from the cmd.exe prompt, it runs as a
                 normal console app; by default, because it is quiet, it displays
                 no messages to the console.  If you pass the -v+ command line
                 argument to the Console SFX when you run it, you will get verbose
                 messages to the console. </para>
               </description>
             </item>
            
             <item>
               <term><c>WinFormsApplication</c></term>
               <description>the SFX extracts automatically when the application
                    is launched, with no additional user input.
               </description>
             </item>
            
             </list>
            
             <para>
               When you set it to false,...
             </para>
            
             <list type="table">
               <listheader>
                 <term>Flavor</term>
                 <description>Behavior</description>
               </listheader>
            
             <item>
               <term><c>ConsoleApplication</c></term>
               <description><para>the extractor will emit a
                 message to the console for each entry extracted.</para>
                 <para>
                   When double-clicking to launch the SFX, the console window will
                   remain, and the SFX will emit a message for each file as it
                   extracts. The messages fly by quickly, they won't be easily readable, unless the extracted files are fairly large. </para> </description> </item> <item> <term><c>WinFormsApplication</c></term> <description>the SFX presents a forms UI and allows the user to select options before extracting. </description> </item> </list> </remarks> </member> <member name="P:Ionic.Zip.SelfExtractorSaveOptions.ExtractExistingFile"> <summary> Specify what the self-extractor will do when extracting an entry would overwrite an existing file. </summary> <remarks> <para> The default behavvior is to Throw. </para> </remarks> </member> <member name="P:Ionic.Zip.SelfExtractorSaveOptions.RemoveUnpackedFilesAfterExecute"> <summary> Whether to remove the files that have been unpacked, after executing the PostExtractCommandLine. </summary> <remarks> <para> If true, and if there is a <see cref="P:Ionic.Zip.SelfExtractorSaveOptions.PostExtractCommandLine"> PostExtractCommandLine</see>, and if the command runs successfully, then the files that the SFX unpacked will be removed, afterwards. If the command does not complete successfully (non-zero return code), that is interpreted as a failure, and the extracted files will not be removed. </para> <para> Setting this flag, and setting <c>Flavor</c> to <c>SelfExtractorFlavor.ConsoleApplication</c>, and setting <c>Quiet</c> to true, results in an SFX that extracts itself, runs a file that was extracted, then deletes all the files that were extracted, with no intervention by the user. You may also want to specify the default extract location, with <c>DefaultExtractDirectory</c>. </para> </remarks> </member> <member name="P:Ionic.Zip.SelfExtractorSaveOptions.FileVersion"> <summary> The file version number to embed into the generated EXE. It will show up, for example, during a mouseover in Windows Explorer. </summary> </member> <member name="P:Ionic.Zip.SelfExtractorSaveOptions.ProductVersion"> <summary> The product version to embed into the generated EXE. It will show up, for example, during a mouseover in Windows Explorer. </summary> <remarks> You can use any arbitrary string, but a human-readable version number is recommended. For example "v1.2 alpha" or "v4.2 RC2". If you specify nothing, then there is no product version embedded into the EXE. </remarks> </member> <member name="P:Ionic.Zip.SelfExtractorSaveOptions.Copyright"> <summary> The copyright notice, if any, to embed into the generated EXE. </summary> <remarks> It will show up, for example, while viewing properties of the file in Windows Explorer. You can use any arbitrary string, but typically you want something like "Copyright � Dino Chiesa 2011". </remarks> </member> <member name="P:Ionic.Zip.SelfExtractorSaveOptions.Description"> <summary> The description to embed into the generated EXE. </summary> <remarks> Use any arbitrary string. This text will be displayed during a mouseover in Windows Explorer. If you specify nothing, then the string "DotNetZip SFX Archive" is embedded into the EXE as the description. </remarks> </member> <member name="P:Ionic.Zip.SelfExtractorSaveOptions.ProductName"> <summary> The product name to embed into the generated EXE. </summary> <remarks> Use any arbitrary string. This text will be displayed while viewing properties of the EXE file in Windows Explorer. </remarks> </member> <member name="P:Ionic.Zip.SelfExtractorSaveOptions.SfxExeWindowTitle"> <summary> The title to display in the Window of a GUI SFX, while it extracts. </summary> <remarks> <para> By default the title show in the GUI window of a self-extractor is "DotNetZip Self-extractor (http://DotNetZip.codeplex.com/)". You can change that by setting this property before saving the SFX. </para> <para> This property has an effect only when producing a Self-extractor of flavor <c>SelfExtractorFlavor.WinFormsApplication</c>. </para> </remarks> </member> <member name="P:Ionic.Zip.SelfExtractorSaveOptions.AdditionalCompilerSwitches"> <summary> Additional options for the csc.exe compiler, when producing the SFX EXE. </summary> <exclude/> </member> <member name="T:Ionic.Zip.ZipFile"> <summary> The ZipFile type represents a zip archive file. </summary> <remarks> <para> This is the main type in the DotNetZip class library. This class reads and writes zip files, as defined in the <see href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">specification for zip files described by PKWare</see>. The compression for this implementation is provided by a managed-code version of Zlib, included with DotNetZip in the classes in the Ionic.Zlib namespace. </para> <para> This class provides a general purpose zip file capability. Use it to read, create, or update zip files. When you want to create zip files using a <c>Stream</c> type to write the zip file, you may want to consider the <see cref="T:Ionic.Zip.ZipOutputStream"/> class. </para> <para> Both the <c>ZipOutputStream</c> class and the <c>ZipFile</c> class can be used to create zip files. Both of them support many of the common zip features, including Unicode, different compression methods and levels, and ZIP64. They provide very similar performance when creating zip files. </para> <para> The <c>ZipFile</c> class is generally easier to use than <c>ZipOutputStream</c> and should be considered a higher-level interface. For example, when creating a zip file via calls to the <c>PutNextEntry()</c> and <c>Write()</c> methods on the <c>ZipOutputStream</c> class, the caller is responsible for opening the file, reading the bytes from the file, writing those bytes into the <c>ZipOutputStream</c>, setting the attributes on the <c>ZipEntry</c>, and setting the created, last modified, and last accessed timestamps on the zip entry. All of these things are done automatically by a call to <see cref="M:Ionic.Zip.ZipFile.AddFile(System.String,System.String)">ZipFile.AddFile()</see>. For this reason, the <c>ZipOutputStream</c> is generally recommended for use only when your application emits arbitrary data, not necessarily data from a filesystem file, directly into a zip file, and does so using a <c>Stream</c> metaphor. </para> <para> Aside from the differences in programming model, there are other differences in capability between the two classes. </para> <list type="bullet"> <item> <c>ZipFile</c> can be used to read and extract zip files, in addition to creating zip files. <c>ZipOutputStream</c> cannot read zip files. If you want to use a stream to read zip files, check out the <see cref="T:Ionic.Zip.ZipInputStream"/> class. </item> <item> <c>ZipOutputStream</c> does not support the creation of segmented or spanned zip files. </item> <item> <c>ZipOutputStream</c> cannot produce a self-extracting archive. </item> </list> <para> Be aware that the <c>ZipFile</c> class implements the <see cref="T:System.IDisposable"/> interface. In order for <c>ZipFile</c> to produce a valid zip file, you use use it within a using clause (<c>Using</c> in VB), or call the <c>Dispose()</c> method explicitly. See the examples for how to employ a using clause. </para> </remarks> </member> <member name="M:Ionic.Zip.ZipFile.SaveSelfExtractor(System.String,Ionic.Zip.SelfExtractorFlavor)"> <summary> Saves the ZipFile instance to a self-extracting zip archive. </summary> <remarks> <para> The generated exe image will execute on any machine that has the .NET Framework 4.0 installed on it. The generated exe image is also a valid ZIP file, readable with DotNetZip or another Zip library or tool such as WinZip. </para> <para> There are two "flavors" of self-extracting archive. The <c>WinFormsApplication</c> version will pop up a GUI and allow the user to select a target directory into which to extract. There's also
             a checkbox allowing the user to specify to overwrite existing files,
             and another checkbox to allow the user to request that Explorer be
             opened to see the extracted files after extraction.  The other flavor
             is <c>ConsoleApplication</c>.  A self-extractor generated with that
             flavor setting will run from the command line. It accepts command-line
             options to set the overwrite behavior, and to specify the target
             extraction directory.
             </para>
            
             <para>
             There are a few temporary files created during the saving to a
             self-extracting zip.  These files are created in the directory pointed
             to by <see cref="P:Ionic.Zip.ZipFile.TempFileFolder"/>, which defaults to <see
             cref="M:System.IO.Path.GetTempPath"/>.  These temporary files are
             removed upon successful completion of this method.
             </para>
            
             <para>
             When a user runs the WinForms SFX, the user's personal directory (<see cref="F:System.Environment.SpecialFolder.Personal">Environment.SpecialFolder.Personal</see>) will be used as the default extract location. If you want to set the default extract location, you should use the other overload of <c>SaveSelfExtractor()</c>/ The user who runs the SFX will have the opportunity to change the extract directory before extracting. When the user runs the Command-Line SFX, the user must explicitly specify the directory to which to extract. The .NET Framework 4.0 is required on the computer when the self-extracting archive is run. </para> <para> NB: This method is not available in the "Reduced" DotNetZip library. </para> </remarks> <example> <code> string DirectoryPath = "c:\\Documents\\Project7"; using (ZipFile zip = new ZipFile()) { zip.AddDirectory(DirectoryPath, System.IO.Path.GetFileName(DirectoryPath)); zip.Comment = "This will be embedded into a self-extracting console-based exe"; zip.SaveSelfExtractor("archive.exe", SelfExtractorFlavor.ConsoleApplication); } </code> <code lang="VB"> Dim DirectoryPath As String = "c:\Documents\Project7" Using zip As New ZipFile() zip.AddDirectory(DirectoryPath, System.IO.Path.GetFileName(DirectoryPath)) zip.Comment = "This will be embedded into a self-extracting console-based exe" zip.SaveSelfExtractor("archive.exe", SelfExtractorFlavor.ConsoleApplication) End Using </code> </example> <param name="exeToGenerate"> a pathname, possibly fully qualified, to be created. Typically it will end in an .exe extension.</param> <param name="flavor"> Indicates whether a Winforms or Console self-extractor is desired. </param> </member> <member name="M:Ionic.Zip.ZipFile.SaveSelfExtractor(System.String,Ionic.Zip.SelfExtractorSaveOptions)"> <summary> Saves the ZipFile instance to a self-extracting zip archive, using the specified save options. </summary> <remarks> <para> This method saves a self extracting archive, using the specified save options. These options include the flavor of the SFX, the default extract directory, the icon file, and so on. See the documentation for <see cref="M:Ionic.Zip.ZipFile.SaveSelfExtractor(System.String,Ionic.Zip.SelfExtractorFlavor)"/> for more details. </para> <para> The user who runs the SFX will have the opportunity to change the extract directory before extracting. If at the time of extraction, the specified directory does not exist, the SFX will create the directory before extracting the files. </para> </remarks> <example> This example saves a WinForms-based self-extracting archive EXE that will use c:\ExtractHere as the default extract location. The C# code shows syntax for .NET 3.0, which uses an object initializer for the SelfExtractorOptions object. <code> string DirectoryPath = "c:\\Documents\\Project7"; using (ZipFile zip = new ZipFile()) { zip.AddDirectory(DirectoryPath, System.IO.Path.GetFileName(DirectoryPath)); zip.Comment = "This will be embedded into a self-extracting WinForms-based exe"; var options = new SelfExtractorOptions { Flavor = SelfExtractorFlavor.WinFormsApplication, DefaultExtractDirectory = "%USERPROFILE%\\ExtractHere", PostExtractCommandLine = ExeToRunAfterExtract, SfxExeWindowTitle = "My Custom Window Title", RemoveUnpackedFilesAfterExecute = true }; zip.SaveSelfExtractor("archive.exe", options); } </code> <code lang="VB"> Dim DirectoryPath As String = "c:\Documents\Project7" Using zip As New ZipFile() zip.AddDirectory(DirectoryPath, System.IO.Path.GetFileName(DirectoryPath)) zip.Comment = "This will be embedded into a self-extracting console-based exe" Dim options As New SelfExtractorOptions() options.Flavor = SelfExtractorFlavor.WinFormsApplication options.DefaultExtractDirectory = "%USERPROFILE%\\ExtractHere" options.PostExtractCommandLine = ExeToRunAfterExtract options.SfxExeWindowTitle = "My Custom Window Title" options.RemoveUnpackedFilesAfterExecute = True zip.SaveSelfExtractor("archive.exe", options) End Using </code> </example> <param name="exeToGenerate">The name of the EXE to generate.</param> <param name="options">provides the options for creating the Self-extracting archive.</param> </member> <member name="M:Ionic.Zip.ZipFile.AddItem(System.String)"> <summary> Adds an item, either a file or a directory, to a zip file archive. </summary> <remarks> <para> This method is handy if you are adding things to zip archive and don't
               want to bother distinguishing between directories or files.  Any files are
               added as single entries.  A directory added through this method is added
               recursively: all files and subdirectories contained within the directory
               are added to the <c>ZipFile</c>.
             </para>
            
             <para>
               The name of the item may be a relative path or a fully-qualified
               path. Remember, the items contained in <c>ZipFile</c> instance get written
               to the disk only when you call <see cref="M:Ionic.Zip.ZipFile.Save"/> or a similar
               save method.
             </para>
            
             <para>
               The directory name used for the file within the archive is the same
               as the directory name (potentially a relative path) specified in the
               <paramref name="fileOrDirectoryName"/>.
             </para>
            
             <para>
               For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see
               cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>,
               <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their
               respective values at the time of this call will be applied to the
               <c>ZipEntry</c> added.
             </para>
            
             </remarks>
            
             <seealso cref="M:Ionic.Zip.ZipFile.AddFile(System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.AddDirectory(System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateItem(System.String)"/>
            
             <overloads>This method has two overloads.</overloads>
             <param name="fileOrDirectoryName">
             the name of the file or directory to add.</param>
            
             <returns>The <c>ZipEntry</c> added.</returns>
        </member>
        <member name="M:Ionic.Zip.ZipFile.AddItem(System.String,System.String)">
             <summary>
               Adds an item, either a file or a directory, to a zip file archive,
               explicitly specifying the directory path to be used in the archive.
             </summary>
            
             <remarks>
             <para>
               If adding a directory, the add is recursive on all files and
               subdirectories contained within it.
             </para>
             <para>
               The name of the item may be a relative path or a fully-qualified path.
               The item added by this call to the <c>ZipFile</c> is not read from the
               disk nor written to the zip file archive until the application calls
               Save() on the <c>ZipFile</c>.
             </para>
            
             <para>
               This version of the method allows the caller to explicitly specify the
               directory path to be used in the archive, which would override the
               "natural" path of the filesystem file.
             </para>
            
             <para>
               Encryption will be used on the file data if the <c>Password</c> has
               been set on the <c>ZipFile</c> object, prior to calling this method.
             </para>
            
             <para>
               For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see
               cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>,
               <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their
               respective values at the time of this call will be applied to the
               <c>ZipEntry</c> added.
             </para>
            
             </remarks>
            
             <exception cref="T:System.IO.FileNotFoundException">
               Thrown if the file or directory passed in does not exist.
             </exception>
            
             <param name="fileOrDirectoryName">the name of the file or directory to add.
             </param>
            
             <param name="directoryPathInArchive">
               The name of the directory path to use within the zip archive.  This path
               need not refer to an extant directory in the current filesystem.  If the
               files within the zip are later extracted, this is the path used for the
               extracted file.  Passing <c>null</c> (<c>Nothing</c> in VB) will use the
               path on the fileOrDirectoryName.  Passing the empty string ("") will
               insert the item at the root path within the archive.
             </param>
            
             <seealso cref="M:Ionic.Zip.ZipFile.AddFile(System.String,System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.AddDirectory(System.String,System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateItem(System.String,System.String)"/>
            
             <example>
               This example shows how to zip up a set of files into a flat hierarchy,
               regardless of where in the filesystem the files originated. The resulting
               zip archive will contain a toplevel directory named "flat", which itself
               will contain files Readme.txt, MyProposal.docx, and Image1.jpg.  A
               subdirectory under "flat" called SupportFiles will contain all the files
               in the "c:\SupportFiles" directory on disk.
            
             <code>
             String[] itemnames= {
               "c:\\fixedContent\\Readme.txt",
               "MyProposal.docx",
               "c:\\SupportFiles",  // a directory
               "images\\Image1.jpg"
             };
            
             try
             {
               using (ZipFile zip = new ZipFile())
               {
                 for (int i = 1; i &lt; itemnames.Length; i++)
                 {
                   // will add Files or Dirs, recurses and flattens subdirectories
                   zip.AddItem(itemnames[i],"flat");
                 }
                 zip.Save(ZipToCreate);
               }
             }
             catch (System.Exception ex1)
             {
               System.Console.Error.WriteLine("exception: {0}", ex1);
             }
             </code>
            
             <code lang="VB">
               Dim itemnames As String() = _
                 New String() { "c:\fixedContent\Readme.txt", _
                                "MyProposal.docx", _
                                "SupportFiles", _
                                "images\Image1.jpg" }
               Try
                   Using zip As New ZipFile
                       Dim i As Integer
                       For i = 1 To itemnames.Length - 1
                           ' will add Files or Dirs, recursing and flattening subdirectories.
                           zip.AddItem(itemnames(i), "flat")
                       Next i
                       zip.Save(ZipToCreate)
                   End Using
               Catch ex1 As Exception
                   Console.Error.WriteLine("exception: {0}", ex1.ToString())
               End Try
             </code>
             </example>
             <returns>The <c>ZipEntry</c> added.</returns>
        </member>
        <member name="M:Ionic.Zip.ZipFile.AddFile(System.String)">
             <summary>
               Adds a File to a Zip file archive.
             </summary>
             <remarks>
             
             <para>
               This call collects metadata for the named file in the filesystem,
               including the file attributes and the timestamp, and inserts that metadata
               into the resulting ZipEntry. Only when the application calls Save() on
               the <c>ZipFile</c>, does DotNetZip read the file from the filesystem and
               then write the content to the zip file archive.
             </para>
             
             <para>
               This method will throw an exception if an entry with the same name already
               exists in the <c>ZipFile</c>.
             </para>
             
             <para>
               For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see
               cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>,
               <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their
               respective values at the time of this call will be applied to the
               <c>ZipEntry</c> added.
             </para>
             
             </remarks>
             
             <example>
             <para>
               In this example, three files are added to a Zip archive. The ReadMe.txt
               file will be placed in the root of the archive. The .png file will be
               placed in a folder within the zip called photos\personal. The pdf file
               will be included into a folder within the zip called Desktop.
             </para>
             <code>
                try
                {
                  using (ZipFile zip = new ZipFile())
                  {
                    zip.AddFile("c:\\photos\\personal\\7440-N49th.png");
                    zip.AddFile("c:\\Desktop\\2008-Regional-Sales-Report.pdf");
                    zip.AddFile("ReadMe.txt");
             
                    zip.Save("Package.zip");
                  }
                }
                catch (System.Exception ex1)
                {
                  System.Console.Error.WriteLine("exception: " + ex1);
                }
             </code>
             
             <code lang="VB">
              Try
                   Using zip As ZipFile = New ZipFile
                       zip.AddFile("c:\photos\personal\7440-N49th.png")
                       zip.AddFile("c:\Desktop\2008-Regional-Sales-Report.pdf")
                       zip.AddFile("ReadMe.txt")
                       zip.Save("Package.zip")
                   End Using
               Catch ex1 As Exception
                   Console.Error.WriteLine("exception: {0}", ex1.ToString)
               End Try
             </code>
             </example>
             
             <overloads>This method has two overloads.</overloads>
             
             <seealso cref="M:Ionic.Zip.ZipFile.AddItem(System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.AddDirectory(System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateFile(System.String)"/>
             
             <param name="fileName">
               The name of the file to add. It should refer to a file in the filesystem.
               The name of the file may be a relative path or a fully-qualified path.
             </param>
             <returns>The <c>ZipEntry</c> corresponding to the File added.</returns>
        </member>
        <member name="M:Ionic.Zip.ZipFile.AddFile(System.String,System.String)">
             <summary>
               Adds a File to a Zip file archive, potentially overriding the path to be
               used within the zip archive.
             </summary>
             
             <remarks>
             <para>
               The file added by this call to the <c>ZipFile</c> is not written to the
               zip file archive until the application calls Save() on the <c>ZipFile</c>.
             </para>
             
             <para>
               This method will throw an exception if an entry with the same name already
               exists in the <c>ZipFile</c>.
             </para>
             
             <para>
               This version of the method allows the caller to explicitly specify the
               directory path to be used in the archive.
             </para>
             
             <para>
               For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see
               cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>,
               <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their
               respective values at the time of this call will be applied to the
               <c>ZipEntry</c> added.
             </para>
             
             </remarks>
             
             <example>
             <para>
               In this example, three files are added to a Zip archive. The ReadMe.txt
               file will be placed in the root of the archive. The .png file will be
               placed in a folder within the zip called images. The pdf file will be
               included into a folder within the zip called files\docs, and will be
               encrypted with the given password.
             </para>
             <code>
             try
             {
               using (ZipFile zip = new ZipFile())
               {
                 // the following entry will be inserted at the root in the archive.
                 zip.AddFile("c:\\datafiles\\ReadMe.txt", "");
                 // this image file will be inserted into the "images" directory in the archive.
                 zip.AddFile("c:\\photos\\personal\\7440-N49th.png", "images");
                 // the following will result in a password-protected file called
                 // files\\docs\\2008-Regional-Sales-Report.pdf in the archive.
                 zip.Password = "EncryptMe!";
                 zip.AddFile("c:\\Desktop\\2008-Regional-Sales-Report.pdf", "files\\docs");
                 zip.Save("Archive.zip");
               }
             }
             catch (System.Exception ex1)
             {
               System.Console.Error.WriteLine("exception: {0}", ex1);
             }
             </code>
             
             <code lang="VB">
               Try
                   Using zip As ZipFile = New ZipFile
                       '
 the following entry will be inserted at the root in the archive.
                       zip.AddFile("c:\datafiles\ReadMe.txt", "")
                       ' this image file will be inserted into the "images" directory in the archive.
                       zip.AddFile("c:\photos\personal\7440-N49th.png", "images")
                       '
 the following will result in a password-protected file called
                       ' files\\docs\\2008-Regional-Sales-Report.pdf in the archive.
                       zip.Password = "EncryptMe!"
                       zip.AddFile("c:\Desktop\2008-Regional-Sales-Report.pdf", "files\documents")
                       zip.Save("Archive.zip")
                   End Using
               Catch ex1 As Exception
                   Console.Error.WriteLine("exception: {0}", ex1)
               End Try
             </code>
             </example>
             
             <seealso cref="M:Ionic.Zip.ZipFile.AddItem(System.String,System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.AddDirectory(System.String,System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateFile(System.String,System.String)"/>
             
             <param name="fileName">
               The name of the file to add. The name of the file may be a relative path
               or a fully-qualified path.
             </param>
             
             <param name="directoryPathInArchive">
               Specifies a directory path to use to override any path in the fileName.
               This path may, or may not, correspond to a real directory in the current
               filesystem. If the files within the zip are later extracted, this is the
               path used for the extracted file. Passing <c>null</c> (<c>Nothing</c> in
               VB) will use the path on the fileName, if any. Passing the empty string
               ("") will insert the item at the root path within the archive.
             </param>
             
             <returns>The <c>ZipEntry</c> corresponding to the file added.</returns>
        </member>
        <member name="M:Ionic.Zip.ZipFile.RemoveEntries(System.Collections.Generic.ICollection{Ionic.Zip.ZipEntry})">
             <summary>
               This method removes a collection of entries from the <c>ZipFile</c>.
             </summary>
             
             <param name="entriesToRemove">
               A collection of ZipEntry instances from this zip file to be removed. For
               example, you can pass in an array of ZipEntry instances; or you can call
               SelectEntries(), and then add or remove entries from that
               ICollection&lt;ZipEntry&gt; (ICollection(Of ZipEntry) in VB), and pass
               that ICollection to this method.
             </param>
             
             <seealso cref="M:Ionic.Zip.ZipFile.SelectEntries(System.String)" />
             <seealso cref="M:Ionic.Zip.ZipFile.RemoveSelectedEntries(System.String)" />
        </member>
        <member name="M:Ionic.Zip.ZipFile.RemoveEntries(System.Collections.Generic.ICollection{System.String})">
             <summary>
               This method removes a collection of entries from the <c>ZipFile</c>, by name.
             </summary>
             
             <param name="entriesToRemove">
               A collection of strings that refer to names of entries to be removed
               from the <c>ZipFile</c>. For example, you can pass in an array or a
               List of Strings that provide the names of entries to be removed.
             </param>
             
             <seealso cref="M:Ionic.Zip.ZipFile.SelectEntries(System.String)" />
             <seealso cref="M:Ionic.Zip.ZipFile.RemoveSelectedEntries(System.String)" />
        </member>
        <member name="M:Ionic.Zip.ZipFile.AddFiles(System.Collections.Generic.IEnumerable{System.String})">
             <summary>
               This method adds a set of files to the <c>ZipFile</c>.
             </summary>
             
             <remarks>
             <para>
               Use this method to add a set of files to the zip archive, in one call.
               For example, a list of files received from
               <c>System.IO.Directory.GetFiles()</c> can be added to a zip archive in one
               call.
             </para>
             
             <para>
               For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see
               cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>,
               <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their
               respective values at the time of this call will be applied to each
               ZipEntry added.
             </para>
             </remarks>
             
             <param name="fileNames">
               The collection of names of the files to add. Each string should refer to a
               file in the filesystem. The name of the file may be a relative path or a
               fully-qualified path.
             </param>
             
             <example>
               This example shows how to create a zip file, and add a few files into it.
             <code>
             String ZipFileToCreate = "archive1.zip";
             String DirectoryToZip = "c:\\reports";
             using (ZipFile zip = new ZipFile())
             {
               // Store all files found in the top level directory, into the zip archive.
               String[] filenames = System.IO.Directory.GetFiles(DirectoryToZip);
               zip.AddFiles(filenames);
               zip.Save(ZipFileToCreate);
             }
             </code>
             
             <code lang="VB">
             Dim ZipFileToCreate As String = "archive1.zip"
             Dim DirectoryToZip As String = "c:\reports"
             Using zip As ZipFile = New ZipFile
                 '
 Store all files found in the top level directory, into the zip archive.
                 Dim filenames As String() = System.IO.Directory.GetFiles(DirectoryToZip)
                 zip.AddFiles(filenames)
                 zip.Save(ZipFileToCreate)
             End Using
             </code>
             </example>
            
             <seealso cref="M:Ionic.Zip.ZipFile.AddSelectedFiles(System.String,System.String)" />
        </member>
        <member name="M:Ionic.Zip.ZipFile.UpdateFiles(System.Collections.Generic.IEnumerable{System.String})">
             <summary>
               Adds or updates a set of files in the <c>ZipFile</c>.
             </summary>
            
             <remarks>
             <para>
               Any files that already exist in the archive are updated. Any files that
               don't yet exist in the archive are added. </para> <para> For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>, <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their respective values at the time of this call will be applied to each ZipEntry added. </para> </remarks> <param name="fileNames"> The collection of names of the files to update. Each string should refer to a file in the filesystem. The name of the file may be a relative path or a fully-qualified path. </param> </member> <member name="M:Ionic.Zip.ZipFile.AddFiles(System.Collections.Generic.IEnumerable{System.String},System.String)"> <summary> Adds a set of files to the <c>ZipFile</c>, using the specified directory path in the archive. </summary> <remarks> <para> Any directory structure that may be present in the filenames contained in the list is "flattened" in the archive. Each file in the list is added to the archive in the specified top-level directory. </para> <para> For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>, <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their respective values at the time of this call will be applied to each ZipEntry added. </para> </remarks> <param name="fileNames"> The names of the files to add. Each string should refer to a file in the filesystem. The name of the file may be a relative path or a fully-qualified path. </param> <param name="directoryPathInArchive"> Specifies a directory path to use to override any path in the file name. Th is path may, or may not, correspond to a real directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing <c>null</c> (<c>Nothing</c> in VB) will use the path on each of the <c>fileNames</c>, if any. Passing the empty string ("") will insert the item at the root path within the archive. </param> <seealso cref="M:Ionic.Zip.ZipFile.AddSelectedFiles(System.String,System.String)" /> </member> <member name="M:Ionic.Zip.ZipFile.AddFiles(System.Collections.Generic.IEnumerable{System.String},System.Boolean,System.String)"> <summary> Adds a set of files to the <c>ZipFile</c>, using the specified directory path in the archive, and preserving the full directory structure in the filenames. </summary> <remarks> <para> Think of the <paramref name="directoryPathInArchive"/> as a "root" or base directory used in the archive for the files that get added. when <paramref name="preserveDirHierarchy"/> is true, the hierarchy of files found in the filesystem will be placed, with the hierarchy intact, starting at that root in the archive. When <c>preserveDirHierarchy</c> is false, the path hierarchy of files is flattned, and the flattened set of files gets placed in the root within the archive as specified in <c>directoryPathInArchive</c>. </para> <para> For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>, <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their respective values at the time of this call will be applied to each ZipEntry added. </para> </remarks> <param name="fileNames"> The names of the files to add. Each string should refer to a file in the filesystem. The name of the file may be a relative path or a fully-qualified path. </param> <param name="directoryPathInArchive"> Specifies a directory path to use as a prefix for each entry name. This path may, or may not, correspond to a real directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing <c>null</c> (<c>Nothing</c> in VB) will use the path on each of the <c>fileNames</c>, if any. Passing the empty string ("") will insert the item at the root path within the archive. </param> <param name="preserveDirHierarchy"> whether the entries in the zip archive will reflect the directory hierarchy that is present in the various filenames. For example, if <paramref name="fileNames"/> includes two paths, \Animalia\Chordata\Mammalia\Info.txt and \Plantae\Magnoliophyta\Dicotyledon\Info.txt, then calling this method with <paramref name="preserveDirHierarchy"/> = <c>false</c> will result in an exception because of a duplicate entry name, while calling this method with <paramref name="preserveDirHierarchy"/> = <c>true</c> will result in the full direcory paths being included in the entries added to the ZipFile. </param> <seealso cref="M:Ionic.Zip.ZipFile.AddSelectedFiles(System.String,System.String)" /> </member> <member name="M:Ionic.Zip.ZipFile.UpdateFiles(System.Collections.Generic.IEnumerable{System.String},System.String)"> <summary> Adds or updates a set of files to the <c>ZipFile</c>, using the specified directory path in the archive. </summary> <remarks> <para> Any files that already exist in the archive are updated. Any files that don't yet exist in the archive are added.
             </para>
            
             <para>
               For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see
               cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>,
               <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their
               respective values at the time of this call will be applied to each
               ZipEntry added.
             </para>
             </remarks>
            
             <param name="fileNames">
               The names of the files to add or update. Each string should refer to a
               file in the filesystem.  The name of the file may be a relative path or a
               fully-qualified path.
             </param>
            
             <param name="directoryPathInArchive">
               Specifies a directory path to use to override any path in the file name.
               This path may, or may not, correspond to a real directory in the current
               filesystem.  If the files within the zip are later extracted, this is the
               path used for the extracted file.  Passing <c>null</c> (<c>Nothing</c> in
               VB) will use the path on each of the <c>fileNames</c>, if any.  Passing
               the empty string ("") will insert the item at the root path within the
               archive.
             </param>
            
             <seealso cref="M:Ionic.Zip.ZipFile.AddSelectedFiles(System.String,System.String)" />
        </member>
        <member name="M:Ionic.Zip.ZipFile.UpdateFile(System.String)">
             <summary>
               Adds or Updates a File in a Zip file archive.
             </summary>
            
             <remarks>
             <para>
               This method adds a file to a zip archive, or, if the file already exists
               in the zip archive, this method Updates the content of that given filename
               in the zip archive.  The <c>UpdateFile</c> method might more accurately be
               called "AddOrUpdateFile".
             </para>
            
             <para>
               Upon success, there is no way for the application to learn whether the file
               was added versus updated.
             </para>
            
             <para>
               For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see
               cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>,
               <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their
               respective values at the time of this call will be applied to the
               <c>ZipEntry</c> added.
             </para>
             </remarks>
            
             <example>
            
               This example shows how to Update an existing entry in a zipfile. The first
               call to UpdateFile adds the file to the newly-created zip archive.  The
               second call to UpdateFile updates the content for that file in the zip
               archive.
            
             <code>
             using (ZipFile zip1 = new ZipFile())
             {
               // UpdateFile might more accurately be called "AddOrUpdateFile"
               zip1.UpdateFile("MyDocuments\\Readme.txt");
               zip1.UpdateFile("CustomerList.csv");
               zip1.Comment = "This zip archive has been created.";
               zip1.Save("Content.zip");
             }
            
             using (ZipFile zip2 = ZipFile.Read("Content.zip"))
             {
               zip2.UpdateFile("Updates\\Readme.txt");
               zip2.Comment = "This zip archive has been updated: The Readme.txt file has been changed.";
               zip2.Save();
             }
            
             </code>
             <code lang="VB">
               Using zip1 As New ZipFile
                   ' UpdateFile might more accurately be called "AddOrUpdateFile"
                   zip1.UpdateFile("MyDocuments\Readme.txt")
                   zip1.UpdateFile("CustomerList.csv")
                   zip1.Comment = "This zip archive has been created."
                   zip1.Save("Content.zip")
               End Using
             
               Using zip2 As ZipFile = ZipFile.Read("Content.zip")
                   zip2.UpdateFile("Updates\Readme.txt")
                   zip2.Comment = "This zip archive has been updated: The Readme.txt file has been changed."
                   zip2.Save
               End Using
             </code>
             </example>
             
             <seealso cref="M:Ionic.Zip.ZipFile.AddFile(System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateDirectory(System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateItem(System.String)"/>
             
             <param name="fileName">
               The name of the file to add or update. It should refer to a file in the
               filesystem. The name of the file may be a relative path or a
               fully-qualified path.
             </param>
             
             <returns>
               The <c>ZipEntry</c> corresponding to the File that was added or updated.
             </returns>
        </member>
        <member name="M:Ionic.Zip.ZipFile.UpdateFile(System.String,System.String)">
             <summary>
               Adds or Updates a File in a Zip file archive.
             </summary>
             
             <remarks>
             <para>
               This method adds a file to a zip archive, or, if the file already exists
               in the zip archive, this method Updates the content of that given filename
               in the zip archive.
             </para>
             
             <para>
               This version of the method allows the caller to explicitly specify the
               directory path to be used in the archive. The entry to be added or
               updated is found by using the specified directory path, combined with the
               basename of the specified filename.
             </para>
             
             <para>
               Upon success, there is no way for the application to learn if the file was
               added versus updated.
             </para>
             
             <para>
               For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see
               cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>,
               <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their
               respective values at the time of this call will be applied to the
               <c>ZipEntry</c> added.
             </para>
             </remarks>
             
             <seealso cref="M:Ionic.Zip.ZipFile.AddFile(System.String,System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateDirectory(System.String,System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateItem(System.String,System.String)"/>
             
             <param name="fileName">
               The name of the file to add or update. It should refer to a file in the
               filesystem. The name of the file may be a relative path or a
               fully-qualified path.
             </param>
             
             <param name="directoryPathInArchive">
               Specifies a directory path to use to override any path in the
               <c>fileName</c>. This path may, or may not, correspond to a real
               directory in the current filesystem. If the files within the zip are
               later extracted, this is the path used for the extracted file. Passing
               <c>null</c> (<c>Nothing</c> in VB) will use the path on the
               <c>fileName</c>, if any. Passing the empty string ("") will insert the
               item at the root path within the archive.
             </param>
             
             <returns>
               The <c>ZipEntry</c> corresponding to the File that was added or updated.
             </returns>
        </member>
        <member name="M:Ionic.Zip.ZipFile.UpdateDirectory(System.String)">
             <summary>
               Add or update a directory in a zip archive.
             </summary>
             
             <remarks>
               If the specified directory does not exist in the archive, then this method
               is equivalent to calling <c>AddDirectory()</c>. If the specified
               directory already exists in the archive, then this method updates any
               existing entries, and adds any new entries. Any entries that are in the
               zip archive but not in the specified directory, are left alone. In other
               words, the contents of the zip file will be a union of the previous
               contents and the new files.
             </remarks>
             
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateFile(System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.AddDirectory(System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateItem(System.String)"/>
             
             <param name="directoryName">
               The path to the directory to be added to the zip archive, or updated in
               the zip archive.
             </param>
             
             <returns>
             The <c>ZipEntry</c> corresponding to the Directory that was added or updated.
             </returns>
        </member>
        <member name="M:Ionic.Zip.ZipFile.UpdateDirectory(System.String,System.String)">
             <summary>
               Add or update a directory in the zip archive at the specified root
               directory in the archive.
             </summary>
             
             <remarks>
               If the specified directory does not exist in the archive, then this method
               is equivalent to calling <c>AddDirectory()</c>. If the specified
               directory already exists in the archive, then this method updates any
               existing entries, and adds any new entries. Any entries that are in the
               zip archive but not in the specified directory, are left alone. In other
               words, the contents of the zip file will be a union of the previous
               contents and the new files.
             </remarks>
             
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateFile(System.String,System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.AddDirectory(System.String,System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateItem(System.String,System.String)"/>
             
             <param name="directoryName">
               The path to the directory to be added to the zip archive, or updated
               in the zip archive.
             </param>
             
             <param name="directoryPathInArchive">
               Specifies a directory path to use to override any path in the
               <c>directoryName</c>. This path may, or may not, correspond to a real
               directory in the current filesystem. If the files within the zip are
               later extracted, this is the path used for the extracted file. Passing
               <c>null</c> (<c>Nothing</c> in VB) will use the path on the
               <c>directoryName</c>, if any. Passing the empty string ("") will insert
               the item at the root path within the archive.
             </param>
             
             <returns>
               The <c>ZipEntry</c> corresponding to the Directory that was added or updated.
             </returns>
        </member>
        <member name="M:Ionic.Zip.ZipFile.UpdateItem(System.String)">
             <summary>
               Add or update a file or directory in the zip archive.
             </summary>
             
             <remarks>
             <para>
               This is useful when the application is not sure or does not care if the
               item to be added is a file or directory, and does not know or does not
               care if the item already exists in the <c>ZipFile</c>. Calling this method
               is equivalent to calling <c>RemoveEntry()</c> if an entry by the same name
               already exists, followed calling by <c>AddItem()</c>.
             </para>
             
             <para>
               For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see
               cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>,
               <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their
               respective values at the time of this call will be applied to the
               <c>ZipEntry</c> added.
             </para>
             </remarks>
             
             <seealso cref="M:Ionic.Zip.ZipFile.AddItem(System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateFile(System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateDirectory(System.String)"/>
             
             <param name="itemName">
              the path to the file or directory to be added or updated.
             </param>
        </member>
        <member name="M:Ionic.Zip.ZipFile.UpdateItem(System.String,System.String)">
             <summary>
               Add or update a file or directory.
             </summary>
             
             <remarks>
             <para>
               This method is useful when the application is not sure or does not care if
               the item to be added is a file or directory, and does not know or does not
               care if the item already exists in the <c>ZipFile</c>. Calling this method
               is equivalent to calling <c>RemoveEntry()</c>, if an entry by that name
               exists, and then calling <c>AddItem()</c>.
             </para>
             
             <para>
               This version of the method allows the caller to explicitly specify the
               directory path to be used for the item being added to the archive. The
               entry or entries that are added or updated will use the specified
               <c>DirectoryPathInArchive</c>. Extracting the entry from the archive will
               result in a file stored in that directory path.
             </para>
             
             <para>
               For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see
               cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>,
               <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their
               respective values at the time of this call will be applied to the
               <c>ZipEntry</c> added.
             </para>
             </remarks>
             
             <seealso cref="M:Ionic.Zip.ZipFile.AddItem(System.String,System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateFile(System.String,System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateDirectory(System.String,System.String)"/>
             
             <param name="itemName">
               The path for the File or Directory to be added or updated.
             </param>
             <param name="directoryPathInArchive">
               Specifies a directory path to use to override any path in the
               <c>itemName</c>. This path may, or may not, correspond to a real
               directory in the current filesystem. If the files within the zip are
               later extracted, this is the path used for the extracted file. Passing
               <c>null</c> (<c>Nothing</c> in VB) will use the path on the
               <c>itemName</c>, if any. Passing the empty string ("") will insert the
               item at the root path within the archive.
             </param>
        </member>
        <member name="M:Ionic.Zip.ZipFile.AddEntry(System.String,System.String)">
             <summary>
               Adds a named entry into the zip archive, taking content for the entry
               from a string.
             </summary>
             
             <remarks>
               Calling this method creates an entry using the given fileName and
               directory path within the archive. There is no need for a file by the
               given name to exist in the filesystem; the name is used within the zip
               archive only. The content for the entry is encoded using the default text
               encoding for the machine.
             </remarks>
             
             <param name="content">
               The content of the file, should it be extracted from the zip.
             </param>
             
             <param name="entryName">
               The name, including any path, to use for the entry within the archive.
             </param>
             
             <returns>The <c>ZipEntry</c> added.</returns>
             
             <example>
             
             This example shows how to add an entry to the zipfile, using a string as
             content for that entry.
             
             <code lang="C#">
             string Content = "This string will be the content of the Readme.txt file in the zip archive.";
             using (ZipFile zip1 = new ZipFile())
             {
               zip1.AddFile("MyDocuments\\Resume.doc", "files");
               zip1.AddEntry("Readme.txt", Content);
               zip1.Comment = "This zip file was created at " + System.DateTime.Now.ToString("G");
               zip1.Save("Content.zip");
             }
             
             </code>
             <code lang="VB">
             Public Sub Run()
               Dim Content As String = "This string will be the content of the Readme.txt file in the zip archive."
               Using zip1 As ZipFile = New ZipFile
                 zip1.AddEntry("Readme.txt", Content)
                 zip1.AddFile("MyDocuments\Resume.doc", "files")
                 zip1.Comment = ("This zip file was created at " &amp; DateTime.Now.ToString("G"))
                 zip1.Save("Content.zip")
               End Using
             End Sub
             </code>
             </example>
        </member>
        <member name="M:Ionic.Zip.ZipFile.AddEntry(System.String,System.String,System.Text.Encoding)">
             <summary>
               Adds a named entry into the zip archive, taking content for the entry
               from a string, and using the specified text encoding.
             </summary>
             
             <remarks>
             
             <para>
               Calling this method creates an entry using the given fileName and
               directory path within the archive. There is no need for a file by the
               given name to exist in the filesystem; the name is used within the zip
               archive only.
             </para>
             
             <para>
               The content for the entry, a string value, is encoded using the given
               text encoding. A BOM (byte-order-mark) is emitted into the file, if the
               Encoding parameter is set for that.
             </para>
             
             <para>
               Most Encoding classes support a constructor that accepts a boolean,
               indicating whether to emit a BOM or not. For example see <see
               cref="M:System.Text.UTF8Encoding.#ctor(System.Boolean)"/>.
             </para>
             
             </remarks>
             
             <param name="entryName">
               The name, including any path, to use within the archive for the entry.
             </param>
             
             <param name="content">
               The content of the file, should it be extracted from the zip.
             </param>
             
             <param name="encoding">
               The text encoding to use when encoding the string. Be aware: This is
               distinct from the text encoding used to encode the fileName, as specified
               in <see cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding" />.
             </param>
             
             <returns>The <c>ZipEntry</c> added.</returns>
             
        </member>
        <member name="M:Ionic.Zip.ZipFile.AddEntry(System.String,System.IO.Stream)">
             <summary>
               Create an entry in the <c>ZipFile</c> using the given <c>Stream</c>
               as input. The entry will have the given filename.
             </summary>
             
             <remarks>
             
             <para>
               The application should provide an open, readable stream; in this case it
               will be read during the call to <see cref="M:Ionic.Zip.ZipFile.Save"/> or one of
               its overloads.
             </para>
             
             <para>
               The passed stream will be read from its current position. If
               necessary, callers should set the position in the stream before
               calling AddEntry(). This might be appropriate when using this method
               with a MemoryStream, for example.
             </para>
             
             <para>
               In cases where a large number of streams will be added to the
               <c>ZipFile</c>, the application may wish to avoid maintaining all of the
               streams open simultaneously. To handle this situation, the application
               should use the <see cref="M:Ionic.Zip.ZipFile.AddEntry(System.String,Ionic.Zip.OpenDelegate,Ionic.Zip.CloseDelegate)"/>
               overload.
             </para>
             
             <para>
               For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see
               cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>,
               <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their
               respective values at the time of this call will be applied to the
               <c>ZipEntry</c> added.
             </para>
             
             </remarks>
             
             <example>
             <para>
               This example adds a single entry to a <c>ZipFile</c> via a <c>Stream</c>.
             </para>
             
             <code lang="C#">
             String zipToCreate = "Content.zip";
             String fileNameInArchive = "Content-From-Stream.bin";
             using (System.IO.Stream streamToRead = MyStreamOpener())
             {
               using (ZipFile zip = new ZipFile())
               {
                 ZipEntry entry= zip.AddEntry(fileNameInArchive, streamToRead);
                 zip.AddFile("Readme.txt");
                 zip.Save(zipToCreate); // the stream is read implicitly here
               }
             }
             </code>
             
             <code lang="VB">
             Dim zipToCreate As String = "Content.zip"
             Dim fileNameInArchive As String = "Content-From-Stream.bin"
             Using streamToRead as System.IO.Stream = MyStreamOpener()
               Using zip As ZipFile = New ZipFile()
                 Dim entry as ZipEntry = zip.AddEntry(fileNameInArchive, streamToRead)
                 zip.AddFile("Readme.txt")
                 zip.Save(zipToCreate) '' the stream is read implicitly, here
               End Using
             End Using
             </code>
             </example>
             
             <seealso cref="M:Ionic.Zip.ZipFile.UpdateEntry(System.String,System.IO.Stream)"/>
             
             <param name="entryName">
               The name, including any path, which is shown in the zip file for the added
               entry.
             </param>
             <param name="stream">
               The input stream from which to grab content for the file
             </param>
             <returns>The <c>ZipEntry</c> added.</returns>
        </member>
        <member name="M:Ionic.Zip.ZipFile.AddEntry(System.String,Ionic.Zip.WriteDelegate)">
             <summary>
               Add a ZipEntry for which content is written directly by the application.
             </summary>
             
             <remarks>
             <para>
               When the application needs to write the zip entry data, use this
               method to add the ZipEntry. For example, in the case that the
               application wishes to write the XML representation of a DataSet into
               a ZipEntry, the application can use this method to do so.
             </para>
             
             <para>
               For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see
               cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>,
               <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their
               respective values at the time of this call will be applied to the
               <c>ZipEntry</c> added.
             </para>
             
             <para>
               About progress events: When using the WriteDelegate, DotNetZip does
               not issue any SaveProgress events with <c>EventType</c> = <see
               cref="F:Ionic.Zip.ZipProgressEventType.Saving_EntryBytesRead">
               Saving_EntryBytesRead</see>. (This is because it is the
               application'
s code that runs in WriteDelegate - there's no way for DotNetZip to know when to issue a EntryBytesRead event.) Applications that want to update a progress bar or similar status indicator should do so from within the WriteDelegate itself. DotNetZip will issue the other SaveProgress events, including <see cref="F:Ionic.Zip.ZipProgressEventType.Saving_Started"> Saving_Started</see>, <see cref="F:Ionic.Zip.ZipProgressEventType.Saving_BeforeWriteEntry"> Saving_BeforeWriteEntry</see>, and <see cref="F:Ionic.Zip.ZipProgressEventType.Saving_AfterWriteEntry"> Saving_AfterWriteEntry</see>. </para> <para> Note: When you use PKZip encryption, it's normally necessary to
               compute the CRC of the content to be encrypted, before compressing or
               encrypting it. Therefore, when using PKZip encryption with a
               WriteDelegate, the WriteDelegate CAN BE called twice: once to compute
               the CRC, and the second time to potentially compress and
               encrypt. Surprising, but true. This is because PKWARE specified that
               the encryption initialization data depends on the CRC.
               If this happens, for each call of the delegate, your
               application must stream the same entry data in its entirety. If your
               application writes different data during the second call, it will
               result in a corrupt zip file.
             </para>
            
             <para>
               The double-read behavior happens with all types of entries, not only
               those that use WriteDelegate. It happens if you add an entry from a
               filesystem file, or using a string, or a stream, or an opener/closer
               pair. But in those cases, DotNetZip takes care of reading twice; in
               the case of the WriteDelegate, the application code gets invoked
               twice. Be aware.
             </para>
            
             <para>
               As you can imagine, this can cause performance problems for large
               streams, and it can lead to correctness problems when you use a
               <c>WriteDelegate</c>. This is a pretty big pitfall.  There are two
               ways to avoid it.  First, and most preferred: don't use PKZIP encryption. If you use the WinZip AES encryption, this problem doesn't occur, because the encryption protocol doesn't require the CRC up front. Second: if you do choose to use PKZIP encryption, write out to a non-seekable stream (like standard output, or the Response.OutputStream in an ASP.NET application). In this case, DotNetZip will use an alternative encryption protocol that does not rely on the CRC of the content. This also implies setting bit 3 in the zip entry, which still presents problems for some zip tools. </para> <para> In the future I may modify DotNetZip to *always* use bit 3 when PKZIP encryption is in use. This seems like a win overall, but there will be some work involved. If you feel strongly about it, visit the DotNetZip forums and vote up <see href="http://dotnetzip.codeplex.com/workitem/13686">the Workitem tracking this issue</see>. </para> </remarks> <param name="entryName">the name of the entry to add</param> <param name="writer">the delegate which will write the entry content</param> <returns>the ZipEntry added</returns> <example> This example shows an application filling a DataSet, then saving the contents of that DataSet as XML, into a ZipEntry in a ZipFile, using an anonymous delegate in C#. The DataSet XML is never saved to a disk file. <code lang="C#"> var c1= new System.Data.SqlClient.SqlConnection(connstring1); var da = new System.Data.SqlClient.SqlDataAdapter() { SelectCommand= new System.Data.SqlClient.SqlCommand(strSelect, c1) }; DataSet ds1 = new DataSet(); da.Fill(ds1, "Invoices"); using(Ionic.Zip.ZipFile zip = new Ionic.Zip.ZipFile()) { zip.AddEntry(zipEntryName, (name,stream) => ds1.WriteXml(stream) ); zip.Save(zipFileName); } </code> </example> <example> This example uses an anonymous method in C# as the WriteDelegate to provide the data for the ZipEntry. The example is a bit contrived - the <c>AddFile()</c> method is a simpler way to insert the contents of a file into an entry in a zip file. On the other hand, if there is some sort of processing or transformation of the file contents required before writing, the application could use the <c>WriteDelegate</c> to do it, in this way. <code lang="C#"> using (var input = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite )) { using(Ionic.Zip.ZipFile zip = new Ionic.Zip.ZipFile()) { zip.AddEntry(zipEntryName, (name,output) => { byte[] buffer = new byte[BufferSize]; int n; while ((n = input.Read(buffer, 0, buffer.Length)) != 0) { // could transform the data here... output.Write(buffer, 0, n); // could update a progress bar here } }); zip.Save(zipFileName); } } </code> </example> <example> This example uses a named delegate in VB to write data for the given ZipEntry (VB9 does not have anonymous delegates). The example here is a bit contrived - a simpler way to add the contents of a file to a ZipEntry is to simply use the appropriate <c>AddFile()</c> method. The key scenario for which the <c>WriteDelegate</c> makes sense is saving a DataSet, in XML format, to the zip file. The DataSet can write XML to a stream, and the WriteDelegate is the perfect place to write into the zip file. There may be other data structures that can write to a stream, but cannot be read as a stream. The <c>WriteDelegate</c> would be appropriate for those cases as well. <code lang="VB"> Private Sub WriteEntry (ByVal name As String, ByVal output As Stream) Using input As FileStream = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite) Dim n As Integer = -1 Dim buffer As Byte() = New Byte(BufferSize){} Do While n &lt;&gt; 0 n = input.Read(buffer, 0, buffer.Length) output.Write(buffer, 0, n) Loop End Using End Sub Public Sub Run() Using zip = New ZipFile zip.AddEntry(zipEntryName, New WriteDelegate(AddressOf WriteEntry)) zip.Save(zipFileName) End Using End Sub </code> </example> </member> <member name="M:Ionic.Zip.ZipFile.AddEntry(System.String,Ionic.Zip.OpenDelegate,Ionic.Zip.CloseDelegate)"> <summary> Add an entry, for which the application will provide a stream containing the entry data, on a just-in-time basis. </summary> <remarks> <para> In cases where the application wishes to open the stream that holds the content for the ZipEntry, on a just-in-time basis, the application can use this method. The application provides an opener delegate that will be called by the DotNetZip library to obtain a readable stream that can be read to get the bytes for the given entry. Typically, this delegate opens a stream. Optionally, the application can provide a closer delegate as well, which will be called by DotNetZip when all bytes have been read from the entry. </para> <para> These delegates are called from within the scope of the call to ZipFile.Save(). </para> <para> For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>, <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their respective values at the time of this call will be applied to the <c>ZipEntry</c> added. </para> </remarks> <example> This example uses anonymous methods in C# to open and close the source stream for the content for a zip entry. <code lang="C#"> using(Ionic.Zip.ZipFile zip = new Ionic.Zip.ZipFile()) { zip.AddEntry(zipEntryName, (name) => File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite ), (name, stream) => stream.Close() ); zip.Save(zipFileName); } </code> </example> <example> This example uses delegates in VB.NET to open and close the the source stream for the content for a zip entry. VB 9.0 lacks support for "Sub" lambda expressions, and so the CloseDelegate must be an actual, named Sub. <code lang="VB"> Function MyStreamOpener(ByVal entryName As String) As Stream '' This simply opens a file. You probably want to do somethinig '' more involved here: open a stream to read from a database, '' open a stream on an HTTP connection, and so on. Return File.OpenRead(entryName) End Function Sub MyStreamCloser(entryName As String, stream As Stream) stream.Close() End Sub Public Sub Run() Dim dirToZip As String = "fodder" Dim zipFileToCreate As String = "Archive.zip" Dim opener As OpenDelegate = AddressOf MyStreamOpener Dim closer As CloseDelegate = AddressOf MyStreamCloser Dim numFilestoAdd As Int32 = 4 Using zip As ZipFile = New ZipFile Dim i As Integer For i = 0 To numFilesToAdd - 1 zip.AddEntry(String.Format("content-{0:000}.txt"), opener, closer) Next i zip.Save(zipFileToCreate) End Using End Sub </code> </example> <param name="entryName">the name of the entry to add</param> <param name="opener"> the delegate that will be invoked by ZipFile.Save() to get the readable stream for the given entry. ZipFile.Save() will call read on this stream to obtain the data for the entry. This data will then be compressed and written to the newly created zip file. </param> <param name="closer"> the delegate that will be invoked to close the stream. This may be null (Nothing in VB), in which case no call is makde to close the stream. </param> <returns>the ZipEntry added</returns> </member> <member name="M:Ionic.Zip.ZipFile.UpdateEntry(System.String,System.String)"> <summary> Updates the given entry in the <c>ZipFile</c>, using the given string as content for the <c>ZipEntry</c>. </summary> <remarks> <para> Calling this method is equivalent to removing the <c>ZipEntry</c> for the given file name and directory path, if it exists, and then calling <see cref="M:Ionic.Zip.ZipFile.AddEntry(System.String,System.String)" />. See the documentation for that method for further explanation. The string content is encoded using the default encoding for the machine. This encoding is distinct from the encoding used for the filename itself. See <see cref="P:Ionic.Zip.ZipFile.AlternateEncoding"/>. </para> </remarks> <param name="entryName"> The name, including any path, to use within the archive for the entry. </param> <param name="content"> The content of the file, should it be extracted from the zip. </param> <returns>The <c>ZipEntry</c> added.</returns> </member> <member name="M:Ionic.Zip.ZipFile.UpdateEntry(System.String,System.String,System.Text.Encoding)"> <summary> Updates the given entry in the <c>ZipFile</c>, using the given string as content for the <c>ZipEntry</c>. </summary> <remarks> Calling this method is equivalent to removing the <c>ZipEntry</c> for the given file name and directory path, if it exists, and then calling <see cref="M:Ionic.Zip.ZipFile.AddEntry(System.String,System.String,System.Text.Encoding)" />. See the documentation for that method for further explanation. </remarks> <param name="entryName"> The name, including any path, to use within the archive for the entry. </param> <param name="content"> The content of the file, should it be extracted from the zip. </param> <param name="encoding"> The text encoding to use when encoding the string. Be aware: This is distinct from the text encoding used to encode the filename. See <see cref="P:Ionic.Zip.ZipFile.AlternateEncoding" />. </param> <returns>The <c>ZipEntry</c> added.</returns> </member> <member name="M:Ionic.Zip.ZipFile.UpdateEntry(System.String,Ionic.Zip.WriteDelegate)"> <summary> Updates the given entry in the <c>ZipFile</c>, using the given delegate as the source for content for the <c>ZipEntry</c>. </summary> <remarks> Calling this method is equivalent to removing the <c>ZipEntry</c> for the given file name and directory path, if it exists, and then calling <see cref="M:Ionic.Zip.ZipFile.AddEntry(System.String,Ionic.Zip.WriteDelegate)" />. See the documentation for that method for further explanation. </remarks> <param name="entryName"> The name, including any path, to use within the archive for the entry. </param> <param name="writer">the delegate which will write the entry content.</param> <returns>The <c>ZipEntry</c> added.</returns> </member> <member name="M:Ionic.Zip.ZipFile.UpdateEntry(System.String,Ionic.Zip.OpenDelegate,Ionic.Zip.CloseDelegate)"> <summary> Updates the given entry in the <c>ZipFile</c>, using the given delegates to open and close the stream that provides the content for the <c>ZipEntry</c>. </summary> <remarks> Calling this method is equivalent to removing the <c>ZipEntry</c> for the given file name and directory path, if it exists, and then calling <see cref="M:Ionic.Zip.ZipFile.AddEntry(System.String,Ionic.Zip.OpenDelegate,Ionic.Zip.CloseDelegate)" />. See the documentation for that method for further explanation. </remarks> <param name="entryName"> The name, including any path, to use within the archive for the entry. </param> <param name="opener"> the delegate that will be invoked to open the stream </param> <param name="closer"> the delegate that will be invoked to close the stream </param> <returns>The <c>ZipEntry</c> added or updated.</returns> </member> <member name="M:Ionic.Zip.ZipFile.UpdateEntry(System.String,System.IO.Stream)"> <summary> Updates the given entry in the <c>ZipFile</c>, using the given stream as input, and the given filename and given directory Path. </summary> <remarks> <para> Calling the method is equivalent to calling <c>RemoveEntry()</c> if an entry by the same name already exists, and then calling <c>AddEntry()</c> with the given <c>fileName</c> and stream. </para> <para> The stream must be open and readable during the call to <c>ZipFile.Save</c>. You can dispense the stream on a just-in-time basis using the <see cref="P:Ionic.Zip.ZipEntry.InputStream"/> property. Check the documentation of that property for more information. </para> <para> For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>, <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their respective values at the time of this call will be applied to the <c>ZipEntry</c> added. </para> </remarks> <seealso cref="M:Ionic.Zip.ZipFile.AddEntry(System.String,System.IO.Stream)"/> <seealso cref="P:Ionic.Zip.ZipEntry.InputStream"/> <param name="entryName"> The name, including any path, to use within the archive for the entry. </param> <param name="stream">The input stream from which to read file data.</param> <returns>The <c>ZipEntry</c> added.</returns> </member> <member name="M:Ionic.Zip.ZipFile.AddEntry(System.String,System.Byte[])"> <summary> Add an entry into the zip archive using the given filename and directory path within the archive, and the given content for the file. No file is created in the filesystem. </summary> <param name="byteContent">The data to use for the entry.</param> <param name="entryName"> The name, including any path, to use within the archive for the entry. </param> <returns>The <c>ZipEntry</c> added.</returns> </member> <member name="M:Ionic.Zip.ZipFile.UpdateEntry(System.String,System.Byte[])"> <summary> Updates the given entry in the <c>ZipFile</c>, using the given byte array as content for the entry. </summary> <remarks> Calling this method is equivalent to removing the <c>ZipEntry</c> for the given filename and directory path, if it exists, and then calling <see cref="M:Ionic.Zip.ZipFile.AddEntry(System.String,System.Byte[])" />. See the documentation for that method for further explanation. </remarks> <param name="entryName"> The name, including any path, to use within the archive for the entry. </param> <param name="byteContent">The content to use for the <c>ZipEntry</c>.</param> <returns>The <c>ZipEntry</c> added.</returns> </member> <member name="M:Ionic.Zip.ZipFile.AddDirectory(System.String)"> <summary> Adds the contents of a filesystem directory to a Zip file archive. </summary> <remarks> <para> The name of the directory may be a relative path or a fully-qualified path. Any files within the named directory are added to the archive. Any subdirectories within the named directory are also added to the archive, recursively. </para> <para> Top-level entries in the named directory will appear as top-level entries in the zip archive. Entries in subdirectories in the named directory will result in entries in subdirectories in the zip archive. </para> <para> If you want the entries to appear in a containing directory in the zip archive itself, then you should call the AddDirectory() overload that allows you to explicitly specify a directory path for use in the archive. </para> <para> For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>, <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their respective values at the time of this call will be applied to each ZipEntry added. </para> </remarks> <seealso cref="M:Ionic.Zip.ZipFile.AddItem(System.String)"/> <seealso cref="M:Ionic.Zip.ZipFile.AddFile(System.String)"/> <seealso cref="M:Ionic.Zip.ZipFile.UpdateDirectory(System.String)"/> <seealso cref="M:Ionic.Zip.ZipFile.AddDirectory(System.String,System.String)"/> <overloads>This method has 2 overloads.</overloads> <param name="directoryName">The name of the directory to add.</param> <returns>The <c>ZipEntry</c> added.</returns> </member> <member name="M:Ionic.Zip.ZipFile.AddDirectory(System.String,System.String)"> <summary> Adds the contents of a filesystem directory to a Zip file archive, overriding the path to be used for entries in the archive. </summary> <remarks> <para> The name of the directory may be a relative path or a fully-qualified path. The add operation is recursive, so that any files or subdirectories within the name directory are also added to the archive. </para> <para> Top-level entries in the named directory will appear as top-level entries in the zip archive. Entries in subdirectories in the named directory will result in entries in subdirectories in the zip archive. </para> <para> For <c>ZipFile</c> properties including <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, <see cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.SetCompression"/>, <see cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/>, <see cref="P:Ionic.Zip.ZipFile.ExtractExistingFile"/>, <see cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, and <see cref="P:Ionic.Zip.ZipFile.CompressionLevel"/>, their respective values at the time of this call will be applied to each ZipEntry added. </para> </remarks> <example> <para> In this code, calling the ZipUp() method with a value of "c:\reports" for the directory parameter will result in a zip file structure in which all entries are contained in a toplevel "reports" directory. </para> <code lang="C#"> public void ZipUp(string targetZip, string directory) { using (var zip = new ZipFile()) { zip.AddDirectory(directory, System.IO.Path.GetFileName(directory)); zip.Save(targetZip); } } </code> </example> <seealso cref="M:Ionic.Zip.ZipFile.AddItem(System.String,System.String)"/> <seealso cref="M:Ionic.Zip.ZipFile.AddFile(System.String,System.String)"/> <seealso cref="M:Ionic.Zip.ZipFile.UpdateDirectory(System.String,System.String)"/> <param name="directoryName">The name of the directory to add.</param> <param name="directoryPathInArchive"> Specifies a directory path to use to override any path in the DirectoryName. This path may, or may not, correspond to a real directory in the current filesystem. If the zip is later extracted, this is the path used for the extracted file or directory. Passing <c>null</c> (<c>Nothing</c> in VB) or the empty string ("") will insert the items at the root path within the archive. </param> <returns>The <c>ZipEntry</c> added.</returns> </member> <member name="M:Ionic.Zip.ZipFile.AddDirectoryByName(System.String)"> <summary> Creates a directory in the zip archive. </summary> <remarks> <para> Use this when you want to create a directory in the archive but there is no corresponding filesystem representation for that directory. </para> <para> You will probably not need to do this in your code. One of the only times you will want to do this is if you want an empty directory in the zip archive. The reason: if you add a file to a zip archive that is stored within a multi-level directory, all of the directory tree is implicitly created in the zip archive. </para> </remarks> <param name="directoryNameInArchive"> The name of the directory to create in the archive. </param> <returns>The <c>ZipEntry</c> added.</returns> </member> <member name="M:Ionic.Zip.ZipFile.CheckZip(System.String)"> <summary> Checks a zip file to see if its directory is consistent. </summary> <remarks> <para> In cases of data error, the directory within a zip file can get out of synch with the entries in the zip file. This method checks the given zip file and returns true if this has occurred. </para> <para> This method may take a long time to run for large zip files. </para> <para> This method is not supported in the Reduced version of DotNetZip. </para> <para> Developers using COM can use the <see cref="M:Ionic.Zip.ComHelper.CheckZip(System.String)">ComHelper.CheckZip(String)</see> method. </para> </remarks> <param name="zipFileName">The filename to of the zip file to check.</param> <returns>true if the named zip file checks OK. Otherwise, false. </returns> <seealso cref="M:Ionic.Zip.ZipFile.FixZipDirectory(System.String)"/> <seealso cref="M:Ionic.Zip.ZipFile.CheckZip(System.String,System.Boolean,System.IO.TextWriter)"/> </member> <member name="M:Ionic.Zip.ZipFile.CheckZip(System.String,System.Boolean,System.IO.TextWriter)"> <summary> Checks a zip file to see if its directory is consistent, and optionally fixes the directory if necessary. </summary> <remarks> <para> In cases of data error, the directory within a zip file can get out of synch with the entries in the zip file. This method checks the given zip file, and returns true if this has occurred. It also optionally fixes the zipfile, saving the fixed copy in <em>Name</em>_Fixed.zip. </para> <para> This method may take a long time to run for large zip files. It will take even longer if the file actually needs to be fixed, and if <c>fixIfNecessary</c> is true. </para> <para> This method is not supported in the Reduced version of DotNetZip. </para> </remarks> <param name="zipFileName">The filename to of the zip file to check.</param> <param name="fixIfNecessary">If true, the method will fix the zip file if necessary.</param> <param name="writer"> a TextWriter in which messages generated while checking will be written. </param> <returns>true if the named zip is OK; false if the file needs to be fixed.</returns> <seealso cref="M:Ionic.Zip.ZipFile.CheckZip(System.String)"/> <seealso cref="M:Ionic.Zip.ZipFile.FixZipDirectory(System.String)"/> </member> <member name="M:Ionic.Zip.ZipFile.FixZipDirectory(System.String)"> <summary> Rewrite the directory within a zipfile. </summary> <remarks> <para> In cases of data error, the directory in a zip file can get out of synch with the entries in the zip file. This method attempts to fix the zip file if this has occurred. </para> <para> This can take a long time for large zip files. </para> <para> This won't work if the zip file uses a non-standard
             code page - neither IBM437 nor UTF-8. </para>
            
             <para>
               This method is not supported in the Reduced or Compact Framework
               versions of DotNetZip.
             </para>
            
             <para>
               Developers using COM can use the <see
               cref="M:Ionic.Zip.ComHelper.FixZipDirectory(System.String)">ComHelper.FixZipDirectory(String)</see>
               method.
             </para>
            
             </remarks>
            
             <param name="zipFileName">The filename to of the zip file to fix.</param>
            
             <seealso cref="M:Ionic.Zip.ZipFile.CheckZip(System.String)"/>
             <seealso cref="M:Ionic.Zip.ZipFile.CheckZip(System.String,System.Boolean,System.IO.TextWriter)"/>
        </member>
        <member name="M:Ionic.Zip.ZipFile.CheckZipPassword(System.String,System.String)">
             <summary>
               Verify the password on a zip file.
             </summary>
            
             <remarks>
               <para>
                 Keep in mind that passwords in zipfiles are applied to
                 zip entries, not to the entire zip file. So testing a
                 zipfile for a particular password doesn't work in the general case. On the other hand, it's often the case
                 that a single password will be used on all entries in a
                 zip file. This method works for that case.
               </para>
               <para>
                 There is no way to check a password without doing the
                 decryption. So this code decrypts and extracts the given
                 zipfile into <see cref="F:System.IO.Stream.Null"/>
               </para>
             </remarks>
            
             <param name="zipFileName">The filename to of the zip file to fix.</param>
            
             <param name="password">The password to check.</param>
            
             <returns>a bool indicating whether the password matches.</returns>
        </member>
        <member name="P:Ionic.Zip.ZipFile.Info">
             <summary>
               Provides a human-readable string with information about the ZipFile.
             </summary>
            
             <remarks>
               <para>
                 The information string contains 10 lines or so, about each ZipEntry,
                 describing whether encryption is in use, the compressed and uncompressed
                 length of the entry, the offset of the entry, and so on. As a result the
                 information string can be very long for zip files that contain many
                 entries.
               </para>
               <para>
                 This information is mostly useful for diagnostic purposes.
               </para>
             </remarks>
        </member>
        <member name="P:Ionic.Zip.ZipFile.FullScan">
             <summary>
             Indicates whether to perform a full scan of the zip file when reading it.
             </summary>
            
             <remarks>
            
             <para>
               You almost never want to use this property.
             </para>
            
             <para>
               When reading a zip file, if this flag is <c>true</c> (<c>True</c> in
               VB), the entire zip archive will be scanned and searched for entries.
               For large archives, this can take a very, long time. The much more
               efficient default behavior is to read the zip directory, which is
               stored at the end of the zip file. But, in some cases the directory is
               corrupted and you need to perform a full scan of the zip file to
               determine the contents of the zip file. This property lets you do
               that, when necessary.
             </para>
            
             <para>
               This flag is effective only when calling <see
               cref="M:Ionic.Zip.ZipFile.Initialize(System.String)"/>. Normally you would read a ZipFile with the
               static <see cref="M:Ionic.Zip.ZipFile.Read(System.String)">ZipFile.Read</see>
               method. But you can't set the <c>FullScan</c> property on the <c>ZipFile</c> instance when you use a static factory method like <c>ZipFile.Read</c>. </para> </remarks> <example> This example shows how to read a zip file using the full scan approach, and then save it, thereby producing a corrected zip file. <code lang="C#"> using (var zip = new ZipFile()) { zip.FullScan = true; zip.Initialize(zipFileName); zip.Save(newName); } </code> <code lang="VB"> Using zip As New ZipFile zip.FullScan = True zip.Initialize(zipFileName) zip.Save(newName) End Using </code> </example> </member> <member name="P:Ionic.Zip.ZipFile.SortEntriesBeforeSaving"> <summary> Whether to sort the ZipEntries before saving the file. </summary> <remarks> The default is false. If you have a large number of zip entries, the sort alone can consume significant time. </remarks> <example> <code lang="C#"> using (var zip = new ZipFile()) { zip.AddFiles(filesToAdd); zip.SortEntriesBeforeSaving = true; zip.Save(name); } </code> <code lang="VB"> Using zip As New ZipFile zip.AddFiles(filesToAdd) zip.SortEntriesBeforeSaving = True zip.Save(name) End Using </code> </example> </member> <member name="P:Ionic.Zip.ZipFile.AddDirectoryWillTraverseReparsePoints"> <summary> Indicates whether NTFS Reparse Points, like junctions, should be traversed during calls to <c>AddDirectory()</c>. </summary> <remarks> By default, calls to AddDirectory() will traverse NTFS reparse points, like mounted volumes, and directory junctions. An example of a junction is the "My Music" directory in Windows Vista. In some cases you may not want DotNetZip to traverse those directories. In that case, set this property to false. </remarks> <example> <code lang="C#"> using (var zip = new ZipFile()) { zip.AddDirectoryWillTraverseReparsePoints = false; zip.AddDirectory(dirToZip,"fodder"); zip.Save(zipFileToCreate); } </code> </example> </member> <member name="P:Ionic.Zip.ZipFile.BufferSize"> <summary> Size of the IO buffer used while saving. </summary> <remarks> <para> First, let me say that you really don't need to bother with this.  It is
               here to allow for optimizations that you probably won't make! It will work fine if you don't set or get this property at all. Ok?
             </para>
            
             <para>
               Now that we have <em>that</em> out of the way, the fine print: This
               property affects the size of the buffer that is used for I/O for each
               entry contained in the zip file. When a file is read in to be compressed,
               it uses a buffer given by the size here.  When you update a zip file, the
               data for unmodified entries is copied from the first zip file to the
               other, through a buffer given by the size here.
             </para>
            
             <para>
               Changing the buffer size affects a few things: first, for larger buffer
               sizes, the memory used by the <c>ZipFile</c>, obviously, will be larger
               during I/O operations.  This may make operations faster for very much
               larger files.  Last, for any given entry, when you use a larger buffer
               there will be fewer progress events during I/O operations, because there's one progress event generated for each time the buffer is filled and then emptied. </para> <para> The default buffer size is 8k. Increasing the buffer size may speed things up as you compress larger files. But there are no hard-and-fast rules here, eh? You won't know til you test it.  And there will be a
               limit where ever larger buffers actually slow things down.  So as I said
               in the beginning, it's probably best if you don't set or get this property
               at all.
             </para>
            
             </remarks>
            
             <example>
             This example shows how you might set a large buffer size for efficiency when
             dealing with zip entries that are larger than 1gb.
             <code lang="C#">
             using (ZipFile zip = new ZipFile())
             {
                 zip.SaveProgress += this.zip1_SaveProgress;
                 zip.AddDirectory(directoryToZip, "");
                 zip.UseZip64WhenSaving = Zip64Option.Always;
                 zip.BufferSize = 65536*8; // 65536 * 8 = 512k
                 zip.Save(ZipFileToCreate);
             }
             </code>
             </example>
        </member>
        <member name="P:Ionic.Zip.ZipFile.CodecBufferSize">
             <summary>
               Size of the work buffer to use for the ZLIB codec during compression.
             </summary>
            
             <remarks>
               <para>
                 When doing ZLIB or Deflate compression, the library fills a buffer,
                 then passes it to the compressor for compression. Then the library
                 reads out the compressed bytes. This happens repeatedly until there
                 is no more uncompressed data to compress. This property sets the
                 size of the buffer that will be used for chunk-wise compression. In
                 order for the setting to take effect, your application needs to set
                 this property before calling one of the <c>ZipFile.Save()</c>
                 overloads.
               </para>
               <para>
                 Setting this affects the performance and memory efficiency of
                 compression and decompression. For larger files, setting this to a
                 larger size may improve compression performance, but the exact
                 numbers vary depending on available memory, the size of the streams
                 you are compressing, and a bunch of other variables. I don't have good firm recommendations on how to set it. You'll have to test it
                 yourself. Or just leave it alone and accept the default.
               </para>
             </remarks>
        </member>
        <member name="P:Ionic.Zip.ZipFile.FlattenFoldersOnExtract">
             <summary>
               Indicates whether extracted files should keep their paths as
               stored in the zip archive.
             </summary>
            
             <remarks>
              <para>
                This property affects Extraction.  It is not used when creating zip
                archives.
              </para>
            
              <para>
                With this property set to <c>false</c>, the default, extracting entries
                from a zip file will create files in the filesystem that have the full
                path associated to the entry within the zip file.  With this property set
                to <c>true</c>, extracting entries from the zip file results in files
                with no path: the folders are "flattened."
              </para>
            
              <para>
                An example: suppose the zip file contains entries /directory1/file1.txt and
                /directory2/file2.txt.  With <c>FlattenFoldersOnExtract</c> set to false,
                the files created will be \directory1\file1.txt and \directory2\file2.txt.
                With the property set to true, the files created are file1.txt and file2.txt.
              </para>
            
             </remarks>
        </member>
        <member name="P:Ionic.Zip.ZipFile.Strategy">
             <summary>
               The compression strategy to use for all entries.
             </summary>
            
             <remarks>
               Set the Strategy used by the ZLIB-compatible compressor, when
               compressing entries using the DEFLATE method. Different compression
               strategies work better on different sorts of data. The strategy
               parameter can affect the compression ratio and the speed of
               compression but not the correctness of the compresssion.  For more
               information see <see
               cref="T:Ionic.Zlib.CompressionStrategy">Ionic.Zlib.CompressionStrategy</see>.
             </remarks>
        </member>
        <member name="P:Ionic.Zip.ZipFile.Name">
             <summary>
               The name of the <c>ZipFile</c>, on disk.
             </summary>
            
             <remarks>
            
             <para>
               When the <c>ZipFile</c> instance was created by reading an archive using
               one of the <c>ZipFile.Read</c> methods, this property represents the name
               of the zip file that was read.  When the <c>ZipFile</c> instance was
               created by using the no-argument constructor, this value is <c>null</c>
               (<c>Nothing</c> in VB).
             </para>
            
             <para>
               If you use the no-argument constructor, and you then explicitly set this
               property, when you call <see cref="M:Ionic.Zip.ZipFile.Save"/>, this name will
               specify the name of the zip file created.  Doing so is equivalent to
               calling <see cref="M:Ionic.Zip.ZipFile.Save(System.String)"/>.  When instantiating a
               <c>ZipFile</c> by reading from a stream or byte array, the <c>Name</c>
               property remains <c>null</c>.  When saving to a stream, the <c>Name</c>
               property is implicitly set to <c>null</c>.
             </para>
             </remarks>
        </member>
        <member name="P:Ionic.Zip.ZipFile.CompressionLevel">
             <summary>
               Sets the compression level to be used for entries subsequently added to
               the zip archive.
             </summary>
            
             <remarks>
              <para>
                Varying the compression level used on entries can affect the
                size-vs-speed tradeoff when compression and decompressing data streams
                or files.
              </para>
            
              <para>
                As with some other properties on the <c>ZipFile</c> class, like <see
                cref="P:Ionic.Zip.ZipFile.Password"/>, <see cref="P:Ionic.Zip.ZipFile.Encryption"/>, and <see
                cref="P:Ionic.Zip.ZipFile.ZipErrorAction"/>, setting this property on a <c>ZipFile</c>
                instance will cause the specified <c>CompressionLevel</c> to be used on all
                <see cref="T:Ionic.Zip.ZipEntry"/> items that are subsequently added to the
                <c>ZipFile</c> instance. If you set this property after you have added
                items to the <c>ZipFile</c>, but before you have called <c>Save()</c>,
                those items will not use the specified compression level.
              </para>
            
              <para>
                If you do not set this property, the default compression level is used,
                which normally gives a good balance of compression efficiency and
                compression speed.  In some tests, using <c>BestCompression</c> can
                double the time it takes to compress, while delivering just a small
                increase in compression efficiency.  This behavior will vary with the
                type of data you compress.  If you are in doubt, just leave this setting
                alone, and accept the default.
              </para>
             </remarks>
        </member>
        <member name="P:Ionic.Zip.ZipFile.CompressionMethod">
            <summary>
              The compression method for the zipfile.
            </summary>
            <remarks>
              <para>
                By default, the compression method is <c>CompressionMethod.Deflate.</c>
              </para>
            </remarks>
            <seealso cref="T:Ionic.Zip.CompressionMethod" />
        </member>
        <member name="P:Ionic.Zip.ZipFile.Comment">
             <summary>
               A comment attached to the zip archive.
             </summary>
            
             <remarks>
            
             <para>
               This property is read/write. It allows the application to specify a
               comment for the <c>ZipFile</c>, or read the comment for the
               <c>ZipFile</c>.  After setting this property, changes are only made
               permanent when you call a <c>Save()</c> method.
             </para>
            
             <para>
               According to <see
               href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">PKWARE's zip specification</see>, the comment is not encrypted, even if there is a password set on the zip file. </para> <para> The specification does not describe how to indicate the encoding used on a comment string. Many "compliant" zip tools and libraries use IBM437 as the code page for comments; DotNetZip, too, follows that practice. On the other hand, there are situations where you want a Comment to be encoded with something else, for example using code page 950 "Big-5 Chinese". To fill that need, DotNetZip will encode the comment following the same procedure it follows for encoding filenames: (a) if <see cref="P:Ionic.Zip.ZipFile.AlternateEncodingUsage"/> is <c>Never</c>, it uses the default encoding (IBM437). (b) if <see cref="P:Ionic.Zip.ZipFile.AlternateEncodingUsage"/> is <c>Always</c>, it always uses the alternate encoding (<see cref="P:Ionic.Zip.ZipFile.AlternateEncoding"/>). (c) if <see cref="P:Ionic.Zip.ZipFile.AlternateEncodingUsage"/> is <c>AsNecessary</c>, it uses the alternate encoding only if the default encoding is not sufficient for encoding the comment - in other words if decoding the result does not produce the original string. This decision is taken at the time of the call to <c>ZipFile.Save()</c>. </para> <para> When creating a zip archive using this library, it is possible to change the value of <see cref="P:Ionic.Zip.ZipFile.AlternateEncoding" /> between each entry you add, and between adding entries and the call to <c>Save()</c>. Don't do this.  It will likely result in a zip file that is
               not readable by any tool or application.  For best interoperability, leave
               <see cref="P:Ionic.Zip.ZipFile.AlternateEncoding"/> alone, or specify it only
               once, before adding any entries to the <c>ZipFile</c> instance.
             </para>
            
             </remarks>
        </member>
        <member name="P:Ionic.Zip.ZipFile.EmitTimesInWindowsFormatWhenSaving">
             <summary>
               Specifies whether the Creation, Access, and Modified times for entries
               added to the zip file will be emitted in &#147;Windows format&#148;
               when the zip archive is saved.
             </summary>
            
             <remarks>
             <para>
               An application creating a zip archive can use this flag to explicitly
               specify that the file times for the entries should or should not be stored
               in the zip archive in the format used by Windows. By default this flag is
               <c>true</c>, meaning the Windows-format times are stored in the zip
               archive.
             </para>
            
             <para>
               When adding an entry from a file or directory, the Creation (<see
               cref="P:Ionic.Zip.ZipEntry.CreationTime"/>), Access (<see
               cref="P:Ionic.Zip.ZipEntry.AccessedTime"/>), and Modified (<see
               cref="P:Ionic.Zip.ZipEntry.ModifiedTime"/>) times for the given entry are
               automatically set from the filesystem values. When adding an entry from a
               stream or string, all three values are implicitly set to
               <c>DateTime.Now</c>.  Applications can also explicitly set those times by
               calling <see cref="M:Ionic.Zip.ZipEntry.SetEntryTimes(System.DateTime,System.DateTime,System.DateTime)"/>.
             </para>
            
             <para>
               <see
               href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">PKWARE's zip specification</see> describes multiple ways to format these times in a zip file. One is the format Windows applications normally use: 100ns ticks since January 1, 1601 UTC. The other is a format Unix applications typically use: seconds since January 1, 1970 UTC. Each format can be stored in an "extra field" in the zip entry when saving the zip archive. The former uses an extra field with a Header Id of 0x000A, while the latter uses a header ID of 0x5455, although you probably don't need to know that.
             </para>
            
             <para>
               Not all tools and libraries can interpret these fields.  Windows
               compressed folders is one that can read the Windows Format timestamps,
               while I believe <see href="http://www.info-zip.org/">the Infozip
               tools</see> can read the Unix format timestamps. Some tools and libraries
               may be able to read only one or the other. DotNetZip can read or write
               times in either or both formats.
             </para>
            
             <para>
               The times stored are taken from <see cref="P:Ionic.Zip.ZipEntry.ModifiedTime"/>, <see
               cref="P:Ionic.Zip.ZipEntry.AccessedTime"/>, and <see cref="P:Ionic.Zip.ZipEntry.CreationTime"/>.
             </para>
            
             <para>
               The value set here applies to all entries subsequently added to the
               <c>ZipFile</c>.
             </para>
            
             <para>
               This property is not mutually exclusive of the <see
               cref="P:Ionic.Zip.ZipFile.EmitTimesInUnixFormatWhenSaving" /> property. It is possible and
               legal and valid to produce a zip file that contains timestamps encoded in
               the Unix format as well as in the Windows format, in addition to the <see
               cref="P:Ionic.Zip.ZipEntry.LastModified">LastModified</see> time attached to each
               entry in the archive, a time that is always stored in "DOS format". And,
               notwithstanding the names PKWare uses for these time formats, any of them
               can be read and written by any computer, on any operating system.  But,
               there are no guarantees that a program running on Mac or Linux will
               gracefully handle a zip file with "Windows" formatted times, or that an
               application that does not use DotNetZip but runs on Windows will be able to
               handle file times in Unix format.
             </para>
            
             <para>
               When in doubt, test.  Sorry, I haven't got a complete list of tools and which sort of timestamps they can use and will tolerate. If you get any good information and would like to pass it on, please do so and I will include that information in this documentation. </para> </remarks> <example> This example shows how to save a zip file that contains file timestamps in a format normally used by Unix. <code lang="C#"> using (var zip = new ZipFile()) { // produce a zip file the Mac will like zip.EmitTimesInWindowsFormatWhenSaving = false; zip.EmitTimesInUnixFormatWhenSaving = true; zip.AddDirectory(directoryToZip, "files"); zip.Save(outputFile); } </code> <code lang="VB"> Using zip As New ZipFile '' produce a zip file the Mac will like zip.EmitTimesInWindowsFormatWhenSaving = False zip.EmitTimesInUnixFormatWhenSaving = True zip.AddDirectory(directoryToZip, "files") zip.Save(outputFile) End Using </code> </example> <seealso cref="P:Ionic.Zip.ZipEntry.EmitTimesInWindowsFormatWhenSaving" /> <seealso cref="P:Ionic.Zip.ZipFile.EmitTimesInUnixFormatWhenSaving" /> </member> <member name="P:Ionic.Zip.ZipFile.EmitTimesInUnixFormatWhenSaving"> <summary> Specifies whether the Creation, Access, and Modified times for entries added to the zip file will be emitted in "Unix(tm) format" when the zip archive is saved. </summary> <remarks> <para> An application creating a zip archive can use this flag to explicitly specify that the file times for the entries should or should not be stored in the zip archive in the format used by Unix. By default this flag is <c>false</c>, meaning the Unix-format times are not stored in the zip archive. </para> <para> When adding an entry from a file or directory, the Creation (<see cref="P:Ionic.Zip.ZipEntry.CreationTime"/>), Access (<see cref="P:Ionic.Zip.ZipEntry.AccessedTime"/>), and Modified (<see cref="P:Ionic.Zip.ZipEntry.ModifiedTime"/>) times for the given entry are automatically set from the filesystem values. When adding an entry from a stream or string, all three values are implicitly set to DateTime.Now. Applications can also explicitly set those times by calling <see cref="M:Ionic.Zip.ZipEntry.SetEntryTimes(System.DateTime,System.DateTime,System.DateTime)"/>. </para> <para> <see href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">PKWARE's
               zip specification</see> describes multiple ways to format these times in a
               zip file. One is the format Windows applications normally use: 100ns ticks
               since January 1, 1601 UTC.  The other is a format Unix applications
               typically use: seconds since January 1, 1970 UTC.  Each format can be
               stored in an "extra field" in the zip entry when saving the zip
               archive. The former uses an extra field with a Header Id of 0x000A, while
               the latter uses a header ID of 0x5455, although you probably don't need to know that. </para> <para> Not all tools and libraries can interpret these fields. Windows compressed folders is one that can read the Windows Format timestamps, while I believe the <see href="http://www.info-zip.org/">Infozip</see> tools can read the Unix format timestamps. Some tools and libraries may be able to read only one or the other. DotNetZip can read or write times in either or both formats. </para> <para> The times stored are taken from <see cref="P:Ionic.Zip.ZipEntry.ModifiedTime"/>, <see cref="P:Ionic.Zip.ZipEntry.AccessedTime"/>, and <see cref="P:Ionic.Zip.ZipEntry.CreationTime"/>. </para> <para> This property is not mutually exclusive of the <see cref="P:Ionic.Zip.ZipFile.EmitTimesInWindowsFormatWhenSaving" /> property. It is possible and legal and valid to produce a zip file that contains timestamps encoded in the Unix format as well as in the Windows format, in addition to the <see cref="P:Ionic.Zip.ZipEntry.LastModified">LastModified</see> time attached to each entry in the zip archive, a time that is always stored in "DOS format". And, notwithstanding the names PKWare uses for these time formats, any of them can be read and written by any computer, on any operating system. But, there are no guarantees that a program running on Mac or Linux will gracefully handle a zip file with "Windows" formatted times, or that an application that does not use DotNetZip but runs on Windows will be able to handle file times in Unix format. </para> <para> When in doubt, test. Sorry, I haven't got a complete list of tools and
               which sort of timestamps they can use and will tolerate.  If you get any
               good information and would like to pass it on, please do so and I will
               include that information in this documentation.
             </para>
             </remarks>
            
             <seealso cref="P:Ionic.Zip.ZipEntry.EmitTimesInUnixFormatWhenSaving" />
             <seealso cref="P:Ionic.Zip.ZipFile.EmitTimesInWindowsFormatWhenSaving" />
        </member>
        <member name="P:Ionic.Zip.ZipFile.Verbose">
             <summary>
               Indicates whether verbose output is sent to the <see
               cref="P:Ionic.Zip.ZipFile.StatusMessageTextWriter"/> during <c>AddXxx()</c> and
               <c>ReadXxx()</c> operations.
             </summary>
            
             <remarks>
               This is a <em>synthetic</em> property.  It returns true if the <see
               cref="P:Ionic.Zip.ZipFile.StatusMessageTextWriter"/> is non-null.
             </remarks>
        </member>
        <member name="M:Ionic.Zip.ZipFile.ContainsEntry(System.String)">
             <summary>
               Returns true if an entry by the given name exists in the ZipFile.
             </summary>
            
             <param name='name'>the name of the entry to find</param>
             <returns>true if an entry with the given name exists; otherwise false.
             </returns>
        </member>
        <member name="P:Ionic.Zip.ZipFile.CaseSensitiveRetrieval">
             <summary>
               Indicates whether to perform case-sensitive matching on the filename when
               retrieving entries in the zipfile via the string-based indexer.
             </summary>
            
             <remarks>
               The default value is <c>false</c>, which means don't do case-sensitive matching. In other words, retrieving zip["ReadMe.Txt"] is the same as zip["readme.txt"]. It really makes sense to set this to <c>true</c> only if you are not running on Windows, which has case-insensitive filenames. But since this library is not built for non-Windows platforms, in most cases you should just leave this property alone. </remarks> </member> <member name="P:Ionic.Zip.ZipFile.IgnoreDuplicateFiles"> <summary> Indicates whether to ignore duplicate files (report only the first entry) when loading a zipfile. </summary> <remarks> The default value is <c>false</c>, which will try to make all files available (duplicates will have a "copy" suffix appended to their name). Setting this to <c>true</c> prior to using <c>Initialize</c> to read a zipfile will prevent this and instead just ignore the duplicates. </remarks> </member> <member name="P:Ionic.Zip.ZipFile.UseUnicodeAsNecessary"> <summary> Indicates whether to encode entry filenames and entry comments using Unicode (UTF-8). </summary> <remarks> <para> <see href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">The PKWare zip specification</see> provides for encoding file names and file comments in either the IBM437 code page, or in UTF-8. This flag selects the encoding according to that specification. By default, this flag is false, and filenames and comments are encoded into the zip file in the IBM437 codepage. Setting this flag to true will specify that filenames and comments that cannot be encoded with IBM437 will be encoded with UTF-8. </para> <para> Zip files created with strict adherence to the PKWare specification with respect to UTF-8 encoding can contain entries with filenames containing any combination of Unicode characters, including the full range of characters from Chinese, Latin, Hebrew, Greek, Cyrillic, and many other alphabets. However, because at this time, the UTF-8 portion of the PKWare specification is not broadly supported by other zip libraries and utilities, such zip files may not be readable by your favorite zip tool or archiver. In other words, interoperability will decrease if you set this flag to true. </para> <para> In particular, Zip files created with strict adherence to the PKWare specification with respect to UTF-8 encoding will not work well with Explorer in Windows XP or Windows Vista, because Windows compressed folders, as far as I know, do not support UTF-8 in zip files. Vista can read the zip files, but shows the filenames incorrectly. Unpacking from Windows Vista Explorer will result in filenames that have rubbish characters in place of the high-order UTF-8 bytes. </para> <para> Also, zip files that use UTF-8 encoding will not work well with Java applications that use the java.util.zip classes, as of v5.0 of the Java runtime. The Java runtime does not correctly implement the PKWare specification in this regard. </para> <para> As a result, we have the unfortunate situation that "correct" behavior by the DotNetZip library with regard to Unicode encoding of filenames during zip creation will result in zip files that are readable by strictly compliant and current tools (for example the most recent release of the commercial WinZip tool); but these zip files will not be readable by various other tools or libraries, including Windows Explorer. </para> <para> The DotNetZip library can read and write zip files with UTF8-encoded entries, according to the PKware spec. If you use DotNetZip for both creating and reading the zip file, and you use UTF-8, there will be no loss of information in the filenames. For example, using a self-extractor created by this library will allow you to unpack files correctly with no loss of information in the filenames. </para> <para> If you do not set this flag, it will remain false. If this flag is false, your <c>ZipFile</c> will encode all filenames and comments using the IBM437 codepage. This can cause "loss of information" on some filenames, but the resulting zipfile will be more interoperable with other utilities. As an example of the loss of information, diacritics can be lost. The o-tilde character will be down-coded to plain o. The c with a cedilla (Unicode 0xE7) used in Portugese will be downcoded to a c. Likewise, the O-stroke character (Unicode 248), used in Danish and Norwegian, will be down-coded to plain o. Chinese characters cannot be represented in codepage IBM437; when using the default encoding, Chinese characters in filenames will be represented as ?. These are all examples of "information loss". </para> <para> The loss of information associated to the use of the IBM437 encoding is inconvenient, and can also lead to runtime errors. For example, using IBM437, any sequence of 4 Chinese characters will be encoded as ????. If your application creates a <c>ZipFile</c>, then adds two files, each with names of four Chinese characters each, this will result in a duplicate filename exception. In the case where you add a single file with a name containing four Chinese characters, calling Extract() on the entry that has question marks in the filename will result in an exception, because the question mark is not legal for use within filenames on Windows. These are just a few examples of the problems associated to loss of information. </para> <para> This flag is independent of the encoding of the content within the entries in the zip file. Think of the zip file as a container - it supports an encoding. Within the container are other "containers" - the file entries themselves. The encoding within those entries is independent of the encoding of the zip archive container for those entries. </para> <para> Rather than specify the encoding in a binary fashion using this flag, an application can specify an arbitrary encoding via the <see cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/> property. Setting the encoding explicitly when creating zip archives will result in non-compliant zip files that, curiously, are fairly interoperable. The challenge is, the PKWare specification does not provide for a way to specify that an entry in a zip archive uses a code page that is neither IBM437 nor UTF-8. Therefore if you set the encoding explicitly when creating a zip archive, you must take care upon reading the zip archive to use the same code page. If you get it wrong, the behavior is undefined and may result in incorrect filenames, exceptions, stomach upset, hair loss, and acne. </para> </remarks> <seealso cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding"/> </member> <member name="P:Ionic.Zip.ZipFile.UseZip64WhenSaving"> <summary> Specify whether to use ZIP64 extensions when saving a zip archive. </summary> <remarks> <para> When creating a zip file, the default value for the property is <see cref="F:Ionic.Zip.Zip64Option.Never"/>. <see cref="F:Ionic.Zip.Zip64Option.AsNecessary"/> is safest, in the sense that you will not get an Exception if a pre-ZIP64 limit is exceeded. </para> <para> You may set the property at any time before calling Save(). </para> <para> When reading a zip file via the <c>Zipfile.Read()</c> method, DotNetZip will properly read ZIP64-endowed zip archives, regardless of the value of this property. DotNetZip will always read ZIP64 archives. This property governs only whether DotNetZip will write them. Therefore, when updating archives, be careful about setting this property after reading an archive that may use ZIP64 extensions. </para> <para> An interesting question is, if you have set this property to <c>AsNecessary</c>, and then successfully saved, does the resulting archive use ZIP64 extensions or not? To learn this, check the <see cref="P:Ionic.Zip.ZipFile.OutputUsedZip64"/> property, after calling <c>Save()</c>. </para> <para> Have you thought about <see href="http://cheeso.members.winisp.net/DotNetZipDonate.aspx">donating</see>? </para> </remarks> <seealso cref="P:Ionic.Zip.ZipFile.RequiresZip64"/> </member> <member name="P:Ionic.Zip.ZipFile.RequiresZip64"> <summary> Indicates whether the archive requires ZIP64 extensions. </summary> <remarks> <para> This property is <c>null</c> (or <c>Nothing</c> in VB) if the archive has not been saved, and there are fewer than 65334 <c>ZipEntry</c> items contained in the archive. </para> <para> The <c>Value</c> is true if any of the following four conditions holds: the uncompressed size of any entry is larger than 0xFFFFFFFF; the compressed size of any entry is larger than 0xFFFFFFFF; the relative offset of any entry within the zip archive is larger than 0xFFFFFFFF; or there are more than 65534 entries in the archive. (0xFFFFFFFF = 4,294,967,295). The result may not be known until a <c>Save()</c> is attempted on the zip archive. The Value of this <see cref="T:System.Nullable"/> property may be set only AFTER one of the Save() methods has been called. </para> <para> If none of the four conditions holds, and the archive has been saved, then the <c>Value</c> is false. </para> <para> A <c>Value</c> of false does not indicate that the zip archive, as saved, does not use ZIP64. It merely indicates that ZIP64 is not required. An archive may use ZIP64 even when not required if the <see cref="P:Ionic.Zip.ZipFile.UseZip64WhenSaving"/> property is set to <see cref="F:Ionic.Zip.Zip64Option.Always"/>, or if the <see cref="P:Ionic.Zip.ZipFile.UseZip64WhenSaving"/> property is set to <see cref="F:Ionic.Zip.Zip64Option.AsNecessary"/> and the output stream was not seekable. Use the <see cref="P:Ionic.Zip.ZipFile.OutputUsedZip64"/> property to determine if the most recent <c>Save()</c> method resulted in an archive that utilized the ZIP64 extensions. </para> </remarks> <seealso cref="P:Ionic.Zip.ZipFile.UseZip64WhenSaving"/> <seealso cref="P:Ionic.Zip.ZipFile.OutputUsedZip64"/> </member> <member name="P:Ionic.Zip.ZipFile.OutputUsedZip64"> <summary> Indicates whether the most recent <c>Save()</c> operation used ZIP64 extensions. </summary> <remarks> <para> The use of ZIP64 extensions within an archive is not always necessary, and for interoperability concerns, it may be desired to NOT use ZIP64 if possible. The <see cref="P:Ionic.Zip.ZipFile.UseZip64WhenSaving"/> property can be set to use ZIP64 extensions only when necessary. In those cases, Sometimes applications want to know whether a Save() actually used ZIP64 extensions. Applications can query this read-only property to learn whether ZIP64 has been used in a just-saved <c>ZipFile</c>. </para> <para> The value is <c>null</c> (or <c>Nothing</c> in VB) if the archive has not been saved. </para> <para> Non-null values (<c>HasValue</c> is true) indicate whether ZIP64 extensions were used during the most recent <c>Save()</c> operation. The ZIP64 extensions may have been used as required by any particular entry because of its uncompressed or compressed size, or because the archive is larger than 4294967295 bytes, or because there are more than 65534 entries in the archive, or because the <c>UseZip64WhenSaving</c> property was set to <see cref="F:Ionic.Zip.Zip64Option.Always"/>, or because the <c>UseZip64WhenSaving</c> property was set to <see cref="F:Ionic.Zip.Zip64Option.AsNecessary"/> and the output stream was not seekable. The value of this property does not indicate the reason the ZIP64 extensions were used. </para> </remarks> <seealso cref="P:Ionic.Zip.ZipFile.UseZip64WhenSaving"/> <seealso cref="P:Ionic.Zip.ZipFile.RequiresZip64"/> </member> <member name="P:Ionic.Zip.ZipFile.InputUsesZip64"> <summary> Indicates whether the most recent <c>Read()</c> operation read a zip file that uses ZIP64 extensions. </summary> <remarks> This property will return null (Nothing in VB) if you've added an entry after reading
               the zip file.
             </remarks>
        </member>
        <member name="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding">
             <summary>
               The text encoding to use when writing new entries to the <c>ZipFile</c>,
               for those entries that cannot be encoded with the default (IBM437)
               encoding; or, the text encoding that was used when reading the entries
               from the <c>ZipFile</c>.
             </summary>
            
             <remarks>
             <para>
               In <see href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">its
               zip specification</see>, PKWare describes two options for encoding
               filenames and comments: using IBM437 or UTF-8.  But, some archiving tools
               or libraries do not follow the specification, and instead encode
               characters using the system default code page.  For example, WinRAR when
               run on a machine in Shanghai may encode filenames with the Big-5 Chinese
               (950) code page.  This behavior is contrary to the Zip specification, but
               it occurs anyway.
             </para>
            
             <para>
               When using DotNetZip to write zip archives that will be read by one of
               these other archivers, set this property to specify the code page to use
               when encoding the <see cref="P:Ionic.Zip.ZipEntry.FileName"/> and <see
               cref="P:Ionic.Zip.ZipEntry.Comment"/> for each <c>ZipEntry</c> in the zip file, for
               values that cannot be encoded with the default codepage for zip files,
               IBM437.  This is why this property is "provisional".  In all cases, IBM437
               is used where possible, in other words, where no loss of data would
               result. It is possible, therefore, to have a given entry with a
               <c>Comment</c> encoded in IBM437 and a <c>FileName</c> encoded with the
               specified "provisional" codepage.
             </para>
            
             <para>
               Be aware that a zip file created after you've explicitly set the <see cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding" /> property to a value other than IBM437 may not be compliant to the PKWare specification, and may not be readable by compliant archivers. On the other hand, many (most?) archivers are non-compliant and can read zip files created in arbitrary code pages. The trick is to use or specify the proper codepage when reading the zip. </para> <para> When creating a zip archive using this library, it is possible to change the value of <see cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding" /> between each entry you add, and between adding entries and the call to <c>Save()</c>. Don't do this. It will likely result in a zipfile that is
               not readable.  For best interoperability, either leave <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding" /> alone, or specify it only once,
               before adding any entries to the <c>ZipFile</c> instance.  There is one
               exception to this recommendation, described later.
             </para>
            
             <para>
               When using an arbitrary, non-UTF8 code page for encoding, there is no
               standard way for the creator application - whether DotNetZip, WinZip,
               WinRar, or something else - to formally specify in the zip file which
               codepage has been used for the entries. As a result, readers of zip files
               are not able to inspect the zip file and determine the codepage that was
               used for the entries contained within it.  It is left to the application
               or user to determine the necessary codepage when reading zip files encoded
               this way.  In other words, if you explicitly specify the codepage when you
               create the zipfile, you must explicitly specify the same codepage when
               reading the zipfile.
             </para>
            
             <para>
               The way you specify the code page to use when reading a zip file varies
               depending on the tool or library you use to read the zip.  In DotNetZip,
               you use a ZipFile.Read() method that accepts an encoding parameter.  It
               isn't possible with Windows Explorer, as far as I know, to specify an explicit codepage to use when reading a zip. If you use an incorrect codepage when reading a zipfile, you will get entries with filenames that are incorrect, and the incorrect filenames may even contain characters that are not legal for use within filenames in Windows. Extracting entries with illegal characters in the filenames will lead to exceptions. It's too
               bad, but this is just the way things are with code pages in zip
               files. Caveat Emptor.
             </para>
            
             <para>
               Example: Suppose you create a zipfile that contains entries with
               filenames that have Danish characters.  If you use <see
               cref="P:Ionic.Zip.ZipFile.ProvisionalAlternateEncoding" /> equal to "iso-8859-1" (cp 28591),
               the filenames will be correctly encoded in the zip.  But, to read that
               zipfile correctly, you have to specify the same codepage at the time you
               read it. If try to read that zip file with Windows Explorer or another
               application that is not flexible with respect to the codepage used to
               decode filenames in zipfiles, you will get a filename like "Inf�.txt".
             </para>
            
             <para>
               When using DotNetZip to read a zip archive, and the zip archive uses an
               arbitrary code page, you must specify the encoding to use before or when
               the <c>Zipfile</c> is READ.  This means you must use a <c>ZipFile.Read()</c>
               method that allows you to specify a System.Text.Encoding parameter.  Setting
               the ProvisionalAlternateEncoding property after your application has read in
               the zip archive will not affect the entry names of entries that have already
               been read in.
             </para>
            
             <para>
               And now, the exception to the rule described above.  One strategy for
               specifying the code page for a given zip file is to describe the code page
               in a human-readable form in the Zip comment. For example, the comment may
               read "Entries in this archive are encoded in the Big5 code page".  For
               maximum interoperability, the zip comment in this case should be encoded
               in the default, IBM437 code page.  In this case, the zip comment is
               encoded using a different page than the filenames.  To do this, Specify
               <c>ProvisionalAlternateEncoding</c> to your desired region-specific code
               page, once before adding any entries, and then reset
               <c>ProvisionalAlternateEncoding</c> to IBM437 before setting the <see
               cref="P:Ionic.Zip.ZipFile.Comment"/> property and calling Save().
             </para>
             </remarks>
            
             <example>
             This example shows how to read a zip file using the Big-5 Chinese code page
             (950), and extract each entry in the zip file.  For this code to work as
             desired, the <c>Zipfile</c> must have been created using the bi