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TaskFactory.FromAsync Method (Func(Of AsyncCallback, Object, IAsyncResult), Action(Of IAsyncResult), 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 Function FromAsync ( _
	beginMethod As Func(Of AsyncCallback, Object, IAsyncResult), _
	endMethod As Action(Of IAsyncResult), _
	state As Object _
) As Task


Type: System.Func(Of AsyncCallback, Object, IAsyncResult)

The delegate that begins the asynchronous operation.

Type: System.Action(Of IAsyncResult)

The delegate that ends the asynchronous operation.

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

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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