FromAsync Method (IAsyncResult, Action(IAsyncResult), TaskCreationOptions, TaskScheduler)
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TaskFactory.FromAsync Method (IAsyncResult, Action<IAsyncResult>, TaskCreationOptions, TaskScheduler)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Creates a Task that executes an end method action when a specified IAsyncResult completes.

Namespace:  System.Threading.Tasks
Assembly:  mscorlib (in mscorlib.dll)

public Task FromAsync(
	IAsyncResult asyncResult,
	Action<IAsyncResult> endMethod,
	TaskCreationOptions creationOptions,
	TaskScheduler scheduler
)

Parameters

asyncResult
Type: System.IAsyncResult
The IAsyncResult whose completion should trigger the processing of the endMethod.
endMethod
Type: System.Action<IAsyncResult>
The action delegate that processes the completed asyncResult.
creationOptions
Type: System.Threading.Tasks.TaskCreationOptions
The TaskCreationOptions value that controls the behavior of the created Task.
scheduler
Type: System.Threading.Tasks.TaskScheduler
The TaskScheduler that is used to schedule the task that executes the end method.

Return Value

Type: System.Threading.Tasks.Task
The created Task that represents the asynchronous operation.

ExceptionCondition
ArgumentNullException

The exception that is thrown when the asyncResult argument is null.

-or-

The exception that is thrown when the endMethod argument is null.

-or-

The exception that is thrown when the scheduler argument is null.

ArgumentOutOfRangeException

The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. For more information, see the Remarks for FromAsync

Windows Phone OS

Supported in: 8.1, 8.0

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