snippets/ProxyFunction.DynamicParameters.ps1

<#
.SYNOPSIS
    Proxy function dynamic parameter block
.DESCRIPTION
    The dynamic parameter block of a proxy function. This block can be used to copy a proxy function target's parameters, regardless of changes from version to version.
#>

[System.Diagnostics.DebuggerStepThrough()]
param(
    # The name of the command being proxied.
    [System.String]
    $CommandName,

    # The type of the command being proxied. Valid values include 'Cmdlet' or 'Function'.
    [System.Management.Automation.CommandTypes]
    $CommandType
)
try {
    #region Look up the command being proxied.

    $wrappedCmd = $ExecutionContext.InvokeCommand.GetCommand($CommandName, $CommandType)

    #endregion

    #region If the command was not found, throw an appropriate command not found exception.

    if (-not $wrappedCmd) {
        $PSCmdlet.ThrowCommandNotFoundError($CommandName, $PSCmdlet.MyInvocation.MyCommand.Name)
    }

    #endregion

    #region Lookup the command metadata.

    $metadata = New-Object -TypeName System.Management.Automation.CommandMetadata -ArgumentList $wrappedCmd

    #endregion

    #region Create dynamic parameters, one for each parameter on the command being proxied.

    $dynamicDictionary = New-Object -TypeName System.Management.Automation.RuntimeDefinedParameterDictionary
    foreach ($key in $metadata.Parameters.Keys) {
        $parameter = $metadata.Parameters[$key]
        $dynamicParameter = New-Object -TypeName System.Management.Automation.RuntimeDefinedParameter -ArgumentList @(
            $parameter.Name
            $parameter.ParameterType
            ,$parameter.Attributes
        )
        $dynamicDictionary.Add($parameter.Name, $dynamicParameter)
    }
    $dynamicDictionary

    #endregion
} catch {
    $PSCmdlet.ThrowTerminatingError($_)
}
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