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

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

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

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

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.

Return Value

Type: System.Threading.Tasks.Task
A 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.

ArgumentOutOfRangeException

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

TipTip

The FromAsync overloads that take an asyncResult parameter are not as efficient as the overloads that take a beginMethod parameter. If performance is an issue, use the overloads that provide the beginMethod/endMethod pattern.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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