Article
11/17/2011

TaskFactory.FromAsync<TResult> 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(Of TResult) ( _
    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<TResult>(
    Func<AsyncCallback, Object, IAsyncResult> beginMethod,
    Func<IAsyncResult, TResult> endMethod,
    Object state,
    TaskCreationOptions creationOptions
)

Type Parameters

TResult
The type of the result available through the Task<TResult>.

Parameters

beginMethod
Type: System.Func<AsyncCallback, Object, IAsyncResult>
The delegate that begins the asynchronous operation.

endMethod
Type: System.Func<IAsyncResult, TResult>
The delegate that ends the asynchronous operation.

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.

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

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

Remarks

This method throws any exceptions thrown by the beginMethod.

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.

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