Using AsyncCallback in Powershell

Question

I have to call a method on .NET object which is defined as

IAsyncResult BeginListMetrics( ListMetricsRequest listMetricsRequest, AsyncCallback callback, Object state )

Is it possible to use a powershell function as a AsyncCallback delegate? How?

Answer 1

Scriptblocks can be converted into most types of delegates by casting as follows.

$myCallback = [AsyncCallback]{
  param( $asyncResult)
  # callback code
  if ($asyncResult.isCompleted) {
    get-date
  }
}