WebClient.OnOpenReadCompleted(OpenReadCompletedEventArgs) Metodo

Definizione

Genera l'evento OpenReadCompleted.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 -> unit
Protected Overridable Sub OnOpenReadCompleted (e As OpenReadCompletedEventArgs)

Parametri

e
OpenReadCompletedEventArgs

Oggetto OpenReadCompletedEventArgs contenente i dati dell'evento.A OpenReadCompletedEventArgs object containing event data.

Esempio

Nell'esempio di codice seguente viene illustrata un'implementazione di questo metodo che può essere personalizzata da una classe derivata da WebClient .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...
}

Commenti

Le classi che ereditano da questa classe possono eseguire l'override di questo metodo per eseguire attività aggiuntive quando OpenReadCompleted si verifica l'evento.Classes that inherit from this class can override this method to perform additional tasks when the OpenReadCompleted event occurs.

Quando viene generato un evento, il gestore dell'evento viene richiamato tramite un delegato.Raising an event invokes the event handler through a delegate. Per altre informazioni, vedere la gestione e generazione di eventi.For more information, see Handling and Raising Events.

Il metodo OnOpenReadCompleted consente inoltre alle classi derivate di gestire l'evento senza associare un delegato.The OnOpenReadCompleted method also allows derived classes to handle the event without attaching a delegate. È la tecnica consigliata per la gestione dell'evento in una classe derivata.This is the preferred technique for handling the event in a derived class.

Note per gli eredi

Quando si esegue l'override OnOpenReadCompleted(OpenReadCompletedEventArgs) in una classe derivata, assicurarsi di chiamare il metodo della classe base in OnOpenReadCompleted(OpenReadCompletedEventArgs) modo che i delegati registrati ricevano l'evento.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.

Si applica a