Async Examples

Interacting with async/await based API's is the primary reason this module was created. Here are some examples to demonstrate how to use this module to accomplish that.

Begin/End/AsyncCallback (APM)

$result = $null
$null = [System.Net.Dns]::BeginResolve(
    'localhost',
    [psdelegate]{ $ar => { $result = [System.Net.Dns]::EndResolve($ar) }},
    $null)

First sets a variable $result in the current scope. This is done because PSLambda can access variables from the scope it was created it. It then initiates Dns.BeginResolve and then returns to the prompt. Once BeginResolve has been completed, the $result variable will be populated with the return value of Dns.EndResolve.

Async/Await (TAP)

using namespace System.Net
using namespace System.Threading.Tasks

$delegate = New-PSDelegate {
    [Task]::Delay(10000).
        ContinueWith{ $task => { return 'message' }}.
        ContinueWith{ $task => $Host.UI.WriteLine($task.GetAwaiter().GetResult()) }
}

$resultTask = $delegate.Invoke()

Creates a task that completes after 10 seconds. After that task completes, continue it with a task that returns a string, then with a task that writes that string to the console.