Error Handling when piping output in workflow using inline script

Question

Hello,
I have powershell code where I am using Workflow and InlineScript. I  am piping output to an Object Property. For some reason Catch doesnt work when it encounters an invalid parameter. Please advice
workflow test-service
    param([string[]]$Server,[string]$svc)
    foreach -parallel ($srv in $server)
        InlineScript
            $props=[ordered]@{
            Computer=$USING:srv;
            Service=$USING:svc;
            State=$null }
Try
                        $props.State=Get-WmiObject -Class Win32_Service -ComputerName $USING:srv | Where-Object {$_.Name -eq $USING:svc} | Select-Object -ExpandProperty State
                Catch
                        $props.State = "$_."
            New-Object -TypeName PSCustomObject -Property $props
$a = "random123456"
test-service -svc $a -Server Client1,Client2Thanks in advance. 
Rajiv

Answer 1

Hi Rajiv,
that certainly explains it :) (sorry I misunderstood the initial question apparently)
Putting this in the Try Block should work:
$props.State = Get-WmiObject -Class Win32_Service -ComputerName $USING:srv -ErrorAction 'Stop' | Where-Object { $_.Name -eq $USING:svc } | Select -ExpandProperty State
if ($props.State -eq $null) { $props.State = "Service does not exist!" }
Two changes here:
I replaced Select State with Select -ExpandProperty State. This should cause it to look a bit better in the output as you get the state value directly, instead of an object with the state property. In your original output you'd have to
call $ExampleOutput.State.State to access the value. With this change you can access it with
$ExampleOutput.State instead.
The second line replaces an empty $props.State (which it will be if there is no such service) with the string
"Service does not exist!" (feel free to replace that with whatever serves your needs).
Cheers,
Fred
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