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copied!<p>When you pass an argument into a Function without piping it in there is no unrolling of collections e.g.</p> <pre><code>function ArgShape($p) { $p.GetType().Fullname $p.Rank $p.Length $p[0].GetType().Fullname } ArgShape (Get-PSCallstack) System.Object[] 1 2 System.Management.Automation.CallStackFrame </code></pre> <p>Also, if you are expecting an array for the parameter to Pass-Callstack you can specify that like so:</p> <pre><code>function Pass-Callstack([object[]]$array) </code></pre> <p>Note that the use of the "System." namespace prefix is optional. PowerShell will prepend that if it can't find the type. Also, to specify a parameter as [object] is essentially a no-op because that is the default type. That is <code>[object]$arg0</code> is the same as <code>$arg0</code>. </p> <p>You are also passing in $null into Pass-Callstack (albeit wrapped in a single element array). The variable $psCallStack is private to the function and not visible outside it unless you do prepend it with a modifier like <code>$script:psCallStack</code>. In general I don't recommend this approach. You should output $pscallstack from Describe-Callstack like so:</p> <pre><code>function Describe-Callstack { Write-Host 'Start Describe-Callstack' $psCallStack = (Get-PSCallStack) $psCallStackType = $psCallStack.GetType() $psCallStackLength = $psCallStack.Length $psCallStackCommand0 = $psCallStack[0].command $psCallStackCommand1 = $psCallStack[1].command Write-Host $psCallStackType Write-Host $psCallStackLength Write-Host $psCallStackCommand0 Write-Host $psCallStackCommand1 $psCallStack } </code></pre> <p>Then assign the output of the function call to a variable:</p> <pre><code>$cs = Describe-Callstack </code></pre> <p>And pass that into Pass-Callstack e.g.:</p> <pre><code>Pass-Callstack $cs </code></pre>

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