Powershell script block with arguments as string

Question

I if a strings, which contains a powershell script block:

$scriptBlock = 'Param (
    [string]$param1,
    [string]$param2,
    [switch]$param3
)
Write-Output ('param1: {0}' -f $param1)
Write-Output ('param2: {0}' -f $param2)
Write-Output ('param3: {0}' -f $param3)'

Inside a second string I have the arguments for the script block.

$arguments = '-param1 "param1Value" -param2 "param2Value" -param3'

My question is how can I invoke the script block with the aruments string?

Why do you have the arguments in a single string? How did you obtain them in the first place? — Mathias R. Jessen
– Mathias R. Jessen, Commented Apr 16, 2017 at 12:18

Mathias R. Jessen · Accepted Answer · 2017-04-16 12:47:48Z

1

Your $scriptblock string assignment is syntactically invalid, use a here-string to avoid having to escape the 's:

$scriptBlock = @'
Param (
    [string]$param1,
    [string]$param2,
    [switch]$param3
)
Write-Output ('param1: {0}' -f $param1)
Write-Output ('param2: {0}' -f $param2)
Write-Output ('param3: {0}' -f $param3)
'@

You could define a function with the contents of the $scriptblock string:

$functionName = "__command$(Get-Random)"
New-Item -Path function:\ -Name $functionName -Value $scriptBlock

Then invoke it using Invoke-Expression:

$result = Invoke-Expression "$functionName $arguments"

And clean up:

Remove-Item function:\$functionName

answered Apr 16, 2017 at 12:47

Mathias R. Jessen

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1 Comment

k7s5a Over a year ago

Thank you! Works like a charm.

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