TaskFactory.FromAsync<TResult> Method (IAsyncResult, Func<IAsyncResult, TResult>, TaskCreationOptions, TaskScheduler)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Creates a Task<TResult> that executes an end method function when a specified IAsyncResult completes.
Assembly: mscorlib (in mscorlib.dll)
public Task<TResult> FromAsync<TResult>(
IAsyncResult asyncResult,
Func<IAsyncResult, TResult> endMethod,
TaskCreationOptions creationOptions,
TaskScheduler scheduler
)
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.
- creationOptions
- Type: System.Threading.Tasks.TaskCreationOptions
The TaskCreationOptions value that controls the behavior of the created Task<TResult>.
- scheduler
- Type: System.Threading.Tasks.TaskScheduler
The TaskScheduler that is used to schedule the task that executes the end method.
Return Value
Type: System.Threading.Tasks.Task<TResult>A Task<TResult> that represents the asynchronous operation.
| 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. -or- The exception that is thrown when the scheduler 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 |