Completed Event Handler Delegate
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Represents the method that will handle the MethodName
Completed event of an asynchronous operation.
public delegate void AsyncCompletedEventHandler(System::Object ^ sender, AsyncCompletedEventArgs ^ e);
public delegate void AsyncCompletedEventHandler(object sender, AsyncCompletedEventArgs e);
public delegate void AsyncCompletedEventHandler(object? sender, AsyncCompletedEventArgs e);
type AsyncCompletedEventHandler = delegate of obj * AsyncCompletedEventArgs -> unit
Public Delegate Sub AsyncCompletedEventHandler(sender As Object, e As AsyncCompletedEventArgs)
The source of the event.
When you create an AsyncCompletedEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event-handler method is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see Handling and Raising Events.
For an asynchronous method, called MethodName, in your component, you will have a corresponding MethodName
Completed event, and an optional MethodName
For a component that supports multiple concurrent invocations of its asynchronous methods, the client can supply a unique token, or task ID, to distinguish which asynchronous task is raising particular events. The client's AsyncCompletedEventHandler can read the AsyncCompletedEventArgs.UserState property to determine which task is reporting completion. Your implementation should use the System.ComponentModel.AsyncOperationManager to create an System.ComponentModel.AsyncOperation that associates the client's task IDs with pending asynchronous tasks.
Gets an object that represents the method represented by the specified delegate.