Convert C# code to PowerShell

Question

Given this piece of code:

someobject.ProgressChanged += (sender, args) => Console.WriteLine(args.ProgressPercentage);

How could I write the same thing in powershell, i used Register-Event but when i called the execute method on the object it just blocks the thread and you only see that the event has fired after the action is finished, I also tried to use Start-Job.

Any ideas?

Frédéric Hamidi · Accepted Answer · 2012-08-24 18:43:43Z

4

Register-ObjectEvent should work:

Register-ObjectEvent -InputObject $someobject -EventName ProgressChanged `
    -Action { Write-Host $EventArgs.ProgressPercentage }

See this TechNet article for more information about asynchronous event handling in PowerShell.

EDIT: As requested in comments, here is the code I used in my tests:

$timer = New-Object System.Timers.Timer
$timer.Interval = 500
$timer.AutoReset = $true
Register-ObjectEvent -InputObject $timer -EventName Elapsed `
    -Action { Write-Host $EventArgs.SignalTime }
$timer.Start()

From there on, the signal times of the Elapsed events were printed to the console every half second until I managed to blind-type $timer.Stop().

edited Aug 24, 2012 at 18:43

answered Aug 24, 2012 at 13:32

Frédéric Hamidi

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3 Comments

user1462199 Over a year ago

I probably wasn't clear enough, you can use Register-ObjectEvent to subscribe to the event but it still only fires after the execution of my method has completed

Frédéric Hamidi Over a year ago

@Taylor, interesting, I tested the code above with a timer and the handler was definitely called asynchronously. Where and how are you triggering the ProgressChanged event? Is it coming from a BackgroundWorker?

user1462199 Over a year ago

my suspicious were right, its actually the library that i am using that is causing this behavior with its MRE.

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