_AsyncCompletedEventArgs Type
Provides data for the MethodName Completed event.
If you add an instance of the TAsyncCompletedEventHandler delegate
to the event, you will receive information about the outcome of
asynchronous operations in the AsyncCompletedEventArgs parameter of
the corresponding event-handler method.
The client
application's event-handler delegate can check the Cancelled
property to determine if the asynchronous task was cancelled.
The client application's event-handler delegate can check the Error
property to determine if an exception occurred during execution of
the asynchronous task.
If the class supports multiple
asynchronous methods, or multiple calls to the same asynchronous
method, you can determine which task raised the MethodName
Completed event by checking the value of the UserState property.
Your code will need to track these tokens, known as task IDs, as
their corresponding asynchronous tasks start and complete.
For more information, see AsyncCompletedEventArgs in C#.
Properties/Method | Description |
|---|---|
Cancelled | Gets a value indicating whether an asynchronous operation has been canceled. |
Error | Gets a value indicating which error occurred during an asynchronous operation. |
UserState | Gets the unique identifier for the asynchronous task. |
RaiseExceptionIfNecessary() | Raises a user-supplied exception if an asynchronous operation failed. |