Windows apps
Collapse the table of content
Expand the table of content

WindowsRuntimeSystemExtensions.AsAsyncAction Method

.NET Framework (current version)

Returns a Windows Runtime asynchronous action that represents a started task.

Namespace:  System
Assembly:  System.Runtime.WindowsRuntime (in System.Runtime.WindowsRuntime.dll)

public static IAsyncAction AsAsyncAction(
	this Task source


Type: System.Threading.Tasks.Task

The started task.

Return Value

Type: IAsyncAction
A Windows.Foundation.IAsyncAction instance that represents the started task.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type Task. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).


source is null.


source is an unstarted task.

Use this method when you want to pass a task to a Windows Runtime method that takes an asynchronous action.

The AsyncInfo class provides static methods (Shared methods in Visual Basic) that create and start Windows Runtime asynchronous actions that represent tasks that can respond to cancellation requests and report progress.

.NET Framework

Supported in: 4.6, 4.5

.NET for Windows Phone apps

Supported in: Windows Phone Silverlight 8
© 2018 Microsoft