Powershell workflow - Get-Service not filtering

Question

I am trying to restart Windows services in parallel via Powershell workflow. When I use Get-Service -DisplayName "S*" outside of workflow I get expected results.

However, when I use the same in workflow, I get ALL services instead. It seems that -Displayname parameter is ignored in workflow.

How do I get only wanted services in PS workflow?

Using script:

workflow Restart-Services(){
    $services = Get-Service -DisplayName "S*"

    Foreach -Parallel ($svc in $services){
        $name = $svc.Name
        Restart-Service -Name $svc -Force
    }
}

Restart-Services

Answer 1

I have no idea why -Name [wildcard] works and -DisplayName [wildcard] doesn't (inside a workflow), but you can use Where-Object to accomplish the filtering if you like:

workflow Restart-Services{
    $services = Get-Service |Where-Object -FilterScript {$_.DisplayName -like "S*"}

    Foreach -Parallel ($svc in $services){
        $name = $svc.Name
        Restart-Service -Name $name
    }
}