Article
11/18/2011

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

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Creates a Task<TResult> that executes an end method function when a specified IAsyncResult completes.

Namespace: System.Threading.Tasks
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public Function FromAsync(Of TResult) ( _
    asyncResult As IAsyncResult, _
    endMethod As Func(Of IAsyncResult, TResult) _
) As Task(Of TResult)

public Task<TResult> FromAsync<TResult>(
    IAsyncResult asyncResult,
    Func<IAsyncResult, TResult> endMethod
)

Type Parameters

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

Parameters

asyncResult
Type: System.IAsyncResult
The IAsyncResult whose completion should trigger the processing of the endMethod.

endMethod
Type: System.Func<IAsyncResult, TResult>
The function delegate that processes the completed asyncResult.

Return Value

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

Exceptions

Exception	Condition
ArgumentNullException	The exception that is thrown when the asyncResult argument is null. -or- The exception that is thrown when the endMethod argument is null.

ArgumentNullException

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

-or-

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