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POUnable to modify function argument in Powershell
 

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    <p>I have a function that is similar to this:</p> <pre><code>function A-Function{ [CmdletBinding(SupportsShouldProcess=$True)] param ( [Parameter(Position=0, HelpMessage="A Test string", Mandatory=$true)] [string]$Path, [Parameter(Position=1, HelpMessage="The list of file names to download.", ValueFromPipeline=$True)] [string[]]$testVar, [Parameter(HelpMessage= "The username")] [string]$User, [Parameter(HelpMessage= "The password")] [string]$Password, [Parameter(HelpMessage= "The credentials used.")] [Net.NetworkCredential]$Credential = (New-Object Net.NetworkCredential("Anonymous", "")) ) Begin { $Path = "TEST_" + $Path if ($User) { if ($Password) { $Credential = New-Object Net.NetworkCredential($User, $Password) } } } Process { $Path $Credential } End { } </code></pre> <p>}</p> <p>If I run "A-Function test -User test -Password -test", I get the output :</p> <p>TEST_test</p> <p>UserName Password SecurePassword Domain<br> -------- -------- -------------- ------<br> test test System.Security.SecureString </p> <p>This is what I expected the output to be. However, if I run this command instead:</p> <blockquote> <p>"Test" | A-Function test -User test -Password -test</p> </blockquote> <p>I get this output instead:</p> <p>TEST_test</p> <p>UserName Password SecurePassword Domain<br> -------- -------- -------------- ------<br> Anonymous System.Security.SecureString</p> <p>In other words, in the second scenario, it hasn't changed the value of the Credential argument in the Begin section, but in the first, it has. I don't understand why this is, can someone explain it?</p> <p>Regards</p>
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