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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)

public:
Task^ FromAsync(
	IAsyncResult^ asyncResult, 
	Action<IAsyncResult^>^ endMethod
)

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.

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.

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

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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