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

Creates a Task(TResult) 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)

member FromAsync : 
        beginMethod:Func<'TArg1, 'TArg2, AsyncCallback, Object, IAsyncResult> * 
        endMethod:Func<IAsyncResult, 'TResult> * 
        arg1:'TArg1 * 
        arg2:'TArg2 * 
        state:Object * 
        creationOptions:TaskCreationOptions -> Task<'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.

TResult

The type of the result available through the Task(TResult).

Parameters

beginMethod
Type: System.Func(TArg1, TArg2, AsyncCallback, Object, IAsyncResult)

The delegate that begins the asynchronous operation.

endMethod
Type: System.Func(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.

creationOptions
Type: System.Threading.Tasks.TaskCreationOptions

The TaskCreationOptions value that controls the behavior of the created Task(TResult).

Return Value

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

ExceptionCondition
ArgumentNullException

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

-or-

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

ArgumentOutOfRangeException

The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. For more information, see the Remarks for FromAsync

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: 4.5.2, 4.5.1, 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

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

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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