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WindowsRuntimeSystemExtensions.AsTask<TProgress> Method (IAsyncActionWithProgress<TProgress>, CancellationToken)

.NET Framework 4.6 and 4.5

Returns a task that represents a Windows Runtime asynchronous action that can be cancelled.

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

public static Task AsTask<TProgress>(
	this IAsyncActionWithProgress<TProgress> source,
	CancellationToken cancellationToken

Type Parameters


The type of object that provides data that indicates progress.


Type: IAsyncActionWithProgress<TProgress>

The asynchronous action.

Type: System.Threading.CancellationToken

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

Return Value

Type: System.Threading.Tasks.Task
A task that represents the asynchronous action.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IAsyncActionWithProgress<TProgress>. 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 object for a Windows Runtime asynchronous operation. Task objects simplify the coordination of asynchronous operations.

Calling this method overload is equivalent to calling the AsTask<TResult, TProgress>(IAsyncOperationWithProgress<TResult, TProgress>, CancellationToken, IProgress<TProgress>) extension method overload and specifying null for the progress parameter. This is useful when you don't want to get progress reports from an action that reports progress.

.NET Framework

Supported in: 4.6, 4.5

.NET for Windows Phone apps

Supported in: Windows Phone Silverlight 8
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