PowerShell Invoke-Command Argumentlist

Question

I'm struggling to pass my arguments to my custom made function.

This works fine:

Delete-OldFiles -Target $Target -OlderThanDays $OlderThanDays -LogName Auto_Clean.log

These don't work at all:

# (using -ScriptBlock ${Function:Delete-OldFiles} for all calls)

Invoke-Command -ArgumentList ( ".$Target", ".$OlderThanDays", ".$LogName Auto_Clean.log")

Invoke-Command -ArgumentList @("$Target", "$OlderThanDays", "Auto_Clean.log") 

Invoke-Command -ArgumentList @({-OlderThanDays "10", -Target "E:\Share\Dir1", -LogName "Auto_Clean.log"})

Invoke-Command -ArgumentList (,@('$Target','$OlderThanDays','Auto_Clean.log'))

Can you help me on how to pass the following parameters correctly:

Param(
    [Parameter(Mandatory=$False,Position=1)]
    [String]$Server,
    [Parameter(Mandatory=$True,Position=2)]
    [ValidateScript({Test-Path $_})]
    [String]$Target,
    [Parameter(Mandatory=$True,Position=3)]
    [Int]$OlderThanDays,
    [Parameter(Mandatory=$True,Position=4)]
    [String]$LogName,
    [switch]$CleanFolders
)

BartekB · Accepted Answer · 2014-05-26 14:12:16Z

4

When you use Invoke-Command -ArgumentList arguments are passed to script block as positional parameters. Looking at you param() block: it was not designed with using positional parameters in mind... Having optional parameters first, and mandatory after means you always need to provide optional parameter, or use named parameters for all mandatory ones.

In other words: having optional parameter in the first position will stop you from running this code in this fashion with Invoke-Command.

To test your code locally you should try it this way:

Delete-OldFiles $Target $OlderThanDays "Auto_Clean.log"

I would expect it to prompt you for LogName parameter.

answered May 26, 2014 at 14:12

BartekB

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1 Comment

DarkLite1 Over a year ago

Thank you BartekB, I finally see it now. I changed the order of my parameters to have the $Servermentioned last and now it works fine. Thanks again man! I was really looking hard on this one...

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