WindowsRuntimeSystemExtensions.AsTask<TResult> Method (IAsyncOperation<TResult>, CancellationToken)

.NET Framework (current version)

Returns a task that represents a Windows Runtime asynchronous operation that returns a result and can be cancelled.

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

public static Task<TResult> AsTask<TResult>(
	this IAsyncOperation<TResult> source,
	CancellationToken cancellationToken

Type Parameters


The type of object that returns the result of the asynchronous operation.


Type: IAsyncOperation<TResult>

The asynchronous operation.

Type: System.Threading.CancellationToken

A token that can be used to request cancellation of the asynchronous operation.

Return Value

Type: System.Threading.Tasks.Task<TResult>
A task that represents the asynchronous operation.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IAsyncOperation<TResult>. 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.

Use this method to get a Task<TResult> object for a Windows Runtime asynchronous operation. Task<TResult> objects simplify the coordination of asynchronous operations.

.NET Framework

Supported in: 4.6, 4.5

.NET for Windows Phone apps

Supported in: Windows Phone Silverlight 8