Private/GetNamedPipes.ps1
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using namespace System.Collections.Generic using namespace System.Linq.Expressions # Need to invoke a non-public method that has ByRef parameters. Typically the powershell engine # handles ByRef behind the scenes but parameter binding needs to be explicit when using reflection. # Because of this I needed to create a proxy method and I wanted to avoid inline C#. function GetNamedPipes { # Get the private method in the private type. $nativeEnumerateDirectory = [ref].Assembly. GetType('System.Management.Automation.Utils'). GetMethod('NativeEnumerateDirectory', 60) # Expressions that declare the variables for the block. $params = [Expression]::Variable([string], 'directory'), [Expression]::Variable([List[string]], 'directories'), [Expression]::Variable([List[string]], 'files') -as [ParameterExpression[]] $body = # An expression that assigns the only parameter that isn't by ref. [Expression]::Assign($params[0], [Expression]::Constant('\\.\pipe', [string])), # An expression that invokes our target method. [Expression]::Call($nativeEnumerateDirectory, $params[0], $params[1], $params[2]), # Return the files variable. Note: the entire array is cast as Expression[], not this var. $params[2] -as [Expression[]] # Combine the expressions into a block expression, then into a lambda expression and compile. $method = [Expression]::Lambda([Expression]::Block($params, $body)).Compile() return $method.Invoke() } |