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TaskFactory.FromAsync<TArg1, TArg2> Method (Func<TArg1, TArg2, AsyncCallback, Object, IAsyncResult>, Action<IAsyncResult>, TArg1, TArg2, Object)

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

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

public Task FromAsync<TArg1, TArg2>(
	Func<TArg1, TArg2, AsyncCallback, Object, IAsyncResult> beginMethod,
	Action<IAsyncResult> endMethod,
	TArg1 arg1,
	TArg2 arg2,
	Object state

Type Parameters


The type of the second argument passed to beginMethod delegate.


The type of the first argument passed to the beginMethod delegate.


Type: System.Func<TArg1, TArg2, AsyncCallback, Object, IAsyncResult>

The delegate that begins the asynchronous operation.

Type: System.Action<IAsyncResult>

The delegate that ends the asynchronous operation.

Type: TArg1

The first argument passed to the beginMethod delegate.

Type: TArg2

The second argument passed to the beginMethod delegate.

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.


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


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.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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