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FromAsync(TArg1) Method (Func(TArg1, AsyncCallback, Object, IAsyncResult), Action(IAsyncResult), TArg1, Object)
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TaskFactory.FromAsync<TArg1> Method (Func<TArg1, AsyncCallback, Object, IAsyncResult>, Action<IAsyncResult>, TArg1, 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>(
	Func<TArg1, AsyncCallback, Object, IAsyncResult> beginMethod,
	Action<IAsyncResult> endMethod,
	TArg1 arg1,
	Object state

Type Parameters


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


Type: System.Func<TArg1, 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: 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

.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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