FromAsync(TResult) Method (IAsyncResult, Func(IAsyncResult, TResult), TaskCreationOptions, TaskScheduler)

Task Parallel System.Threading

previous page next page

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

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

Syntax

Visual Basic (Declaration)
Public Function FromAsync(Of TResult) ( _ asyncResult As IAsyncResult, _ endMethod As Func(Of IAsyncResult, TResult), _ creationOptions As TaskCreationOptions, _ scheduler As TaskScheduler _ ) As Task(Of TResult)

Visual Basic (Declaration)

Public Function FromAsync(Of TResult) ( _
	asyncResult As IAsyncResult, _
	endMethod As Func(Of IAsyncResult, TResult), _
	creationOptions As TaskCreationOptions, _
	scheduler As TaskScheduler _
) As Task(Of TResult)

C#
public Task<TResult> FromAsync<TResult>( IAsyncResult asyncResult, Func<IAsyncResult, TResult> endMethod, TaskCreationOptions creationOptions, TaskScheduler scheduler )

Parameters

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

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

creationOptions: Type: System.Threading.Tasks..::.TaskCreationOptions
The TaskCreationOptions value that controls the behavior of the created Task.

scheduler: Type: System.Threading.Tasks..::.TaskScheduler
The TaskScheduler that is used to schedule the task that executes the end method.

Type Parameters

TResult: The type of the result available through the Task.

Return Value

A Task that represents the asynchronous operation.

Exceptions

Exception	Condition
System..::.ArgumentNullException	The exception that is thrown when the asyncResult argument is null.
System..::.ArgumentNullException	The exception that is thrown when the endMethod argument is null.
System..::.ArgumentNullException	The exception that is thrown when the scheduler argument is null.
System..::.ArgumentOutOfRangeException	The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value.