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

 

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

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

member FromAsync : 
        asyncResult:IAsyncResult *
        endMethod:Action<IAsyncResult> -> Task

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.

Return Value

Type: System.Threading.Tasks.Task

A Task that represents the asynchronous operation.

Exception Condition
ArgumentNullException

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

-or-

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

System_CAPS_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.

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 5.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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