WebClient.OnOpenReadCompleted(OpenReadCompletedEventArgs) Method
Definition
Important
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.
Raises the OpenReadCompleted event.
protected:
virtual void OnOpenReadCompleted(System::Net::OpenReadCompletedEventArgs ^ e);protected virtual void OnOpenReadCompleted (System.Net.OpenReadCompletedEventArgs e);abstract member OnOpenReadCompleted : System.Net.OpenReadCompletedEventArgs -> unit
override this.OnOpenReadCompleted : System.Net.OpenReadCompletedEventArgs -> unitProtected Overridable Sub OnOpenReadCompleted (e As OpenReadCompletedEventArgs)Parameters
A OpenReadCompletedEventArgs object containing event data.
Examples
The following code example shows an implementation of this method that can be customized by a class derived from WebClient.
virtual void OnOpenReadCompleted( OpenReadCompletedEventArgs ^ e ) override
{
// Here you can perform any custom actions before the event is raised
// and event handlers are called...
WebClient::OnOpenReadCompleted( e );
// Here you can perform any post event actions...
}
protected override void OnOpenReadCompleted (OpenReadCompletedEventArgs e)
{
// Here you can perform any custom actions before the event is raised
// and event handlers are called...
base.OnOpenReadCompleted (e);
// Here you can perform any post event actions...
}
Remarks
Caution
WebRequest, HttpWebRequest, ServicePoint, and WebClient are obsolete, and you shouldn't use them for new development. Use HttpClient instead.
Classes that inherit from this class can override this method to perform additional tasks when the OpenReadCompleted event occurs.
Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.
The OnOpenReadCompleted method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
Notes to Inheritors
When overriding OnOpenReadCompleted(OpenReadCompletedEventArgs) in a derived class, be sure to call the base class' OnOpenReadCompleted(OpenReadCompletedEventArgs) method so that registered delegates receive the event.
