• Article

TaskFactory<TResult>.FromAsync Method (Func<AsyncCallback, Object, IAsyncResult>, Func<IAsyncResult, TResult>, Object, TaskCreationOptions)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

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)

Syntax

'Declaration
Public Function FromAsync ( _
    beginMethod As Func(Of AsyncCallback, Object, IAsyncResult), _
    endMethod As Func(Of IAsyncResult, TResult), _
    state As Object, _
    creationOptions As TaskCreationOptions _
) As Task(Of TResult)

public Task<TResult> FromAsync(
    Func<AsyncCallback, Object, IAsyncResult> beginMethod,
    Func<IAsyncResult, TResult> endMethod,
    Object state,
    TaskCreationOptions creationOptions
)

Parameters

  • state
    Type: System.Object
    An object containing data to be used by the beginMethod delegate.

Return Value

Type: System.Threading.Tasks.Task<TResult>
The created Task<TResult> that represents the asynchronous operation.

Exceptions

Exception Condition
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.

Remarks

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

Version Information

Silverlight

Supported in: 5

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.