FromAsync(TArg1, TArg2) Method (Func(TArg1, TArg2, AsyncCallback, Object, IAsyncResult), Func(IAsyncResult, TResult), TArg1, TArg2, Object)

TaskFactory(Of TResult).FromAsync(Of TArg1, TArg2) Method (Func(Of TArg1, TArg2, AsyncCallback, Object, IAsyncResult), Func(Of IAsyncResult, TResult), TArg1, TArg2, Object)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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)

'Declaration
Public Function FromAsync(Of TArg1, TArg2) ( _
	beginMethod As Func(Of TArg1, TArg2, AsyncCallback, Object, IAsyncResult), _
	endMethod As Func(Of IAsyncResult, TResult), _
	arg1 As TArg1, _
	arg2 As TArg2, _
	state As Object _
) As Task(Of TResult)

Type Parameters

TArg1

The type of the second argument passed to beginMethod delegate.

TArg2

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

Parameters

beginMethod
Type: System.Func(Of TArg1, TArg2, AsyncCallback, Object, IAsyncResult)
The delegate that begins the asynchronous operation.
endMethod
Type: System.Func(Of IAsyncResult, TResult)
The delegate that ends the asynchronous operation.
arg1
Type: TArg1
The first argument passed to the beginMethod delegate.
arg2
Type: TArg2
The second argument passed to the beginMethod delegate.
state
Type: System.Object
An object containing data to be used by the beginMethod delegate.

Return Value

Type: System.Threading.Tasks.Task(Of TResult)
The created task that represents the asynchronous operation.

ExceptionCondition
ArgumentNullException

The beginMethod argument is Nothing.

-or-

The endMethod argument is Nothing.

This method throws any exceptions thrown by the beginMethod. Exceptions for endmethod are thrown when waiting on the returned task.

Windows Phone OS

Supported in: 8.1, 8.0

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