FromAsync Method (Func(AsyncCallback, Object, IAsyncResult), Action(IAsyncResult), Object)
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TaskFactory.FromAsync Method (Func<AsyncCallback, Object, IAsyncResult>, Action<IAsyncResult>, Object)

.NET Framework (current version)
 

Creates a Task that represents a pair of begin and end methods that conform to the Asynchronous Programming Model pattern.

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

public Task FromAsync(
	Func<AsyncCallback, object, IAsyncResult> beginMethod,
	Action<IAsyncResult> endMethod,
	object state
)

Parameters

beginMethod
Type: System.Func<AsyncCallback, Object, IAsyncResult>

The delegate that begins the asynchronous operation.

endMethod
Type: System.Action<IAsyncResult>

The delegate that ends the asynchronous operation.

state
Type: System.Object

An object containing data to be used by the beginMethod delegate.

Return Value

Type: System.Threading.Tasks.Task

The created Task that represents the asynchronous operation.

Exception Condition
ArgumentNullException

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

-or-

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

The beginMethod delegate is started on the thread that FromAsync is running on. This method throws any exceptions thrown by the beginMethod.

Universal Windows Platform
Available since 4.5
.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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