Mastering Windows PowerShell Scripting - Third Edition

Running multiple instances

As an individual instance is executing asynchronously with BeginInvoke, several may be started. In each case, both the PowerShell object and the IASyncResult object should be preserved:

$jobs = 1..5 | ForEach-Object {    $instance = [PowerShell]::Create().AddScript('        Start-Sleep -Seconds (Get-Random -Minimum 10 -Maximum 121)    ')    [PSCustomObject]@{        Id          = $instance.InstanceId        Instance    = $instance        AsyncResult = $instance.BeginInvoke()    } | Add-Member State -MemberType ScriptProperty -PassThru -Value {        $this.Instance.InvocationStateInfo.State    }}

Each job will continue for a random number of seconds and then complete. As each job completes, the State property created by Add-Member will change to reflect that:

PS> $jobs | Select-Object ...