ActiveDesignerEventHandler Délégué

Définition

Espace de noms:

System.ComponentModel.Design

Assembly:

System.ComponentModel.TypeConverter.dll

Représente la méthode qui gérera l'événement ActiveDesignerChanged.

public delegate void ActiveDesignerEventHandler(System::Object ^ sender, ActiveDesignerEventArgs ^ e);

public delegate void ActiveDesignerEventHandler(object? sender, ActiveDesignerEventArgs e);

type ActiveDesignerEventHandler = delegate of obj * ActiveDesignerEventArgs -> unit

Public Delegate Sub ActiveDesignerEventHandler(sender As Object, e As ActiveDesignerEventArgs)

Paramètres

sender

Object

Source de l'événement.

e

ActiveDesignerEventArgs

ActiveDesignerEventArgs qui contient les données d’événement.

Exemples

L’exemple suivant illustre l’inscription d’un et la ActiveDesignerEventHandler gestion d’un ActiveDesignerChanged événement.

public:
   void LinkActiveDesignerEvent( IDesignerEventService^ eventService )
   {
      // Registers an event handler for the ActiveDesignerChanged event.
      eventService->ActiveDesignerChanged += gcnew ActiveDesignerEventHandler( this, &MiscCompModSamples::ActiveDesignerEventHandlerExample::OnActiveDesignerEvent );
   }

private:
   void OnActiveDesignerEvent( Object^ /*sender*/, ActiveDesignerEventArgs^ e )
   {
      // Displays changed designer information on the console.
      if ( e->NewDesigner->RootComponent->Site != nullptr )
      {
         Console::WriteLine( "Name of the component of the new active designer: {0}", e->NewDesigner->RootComponent->Site->Name );
      }
      Console::WriteLine( "Type of the component of the new active designer: {0}", e->NewDesigner->RootComponentClassName );
      if ( e->OldDesigner->RootComponent->Site != nullptr )
      {
         Console::WriteLine( "Name of the component of the previously active designer: {0}", e->OldDesigner->RootComponent->Site->Name );
      }
      Console::WriteLine( "Type of the component of the previously active designer: {0}", e->OldDesigner->RootComponentClassName );
   }

public void LinkActiveDesignerEvent(IDesignerEventService eventService)
{
    // Registers an event handler for the ActiveDesignerChanged event.
    eventService.ActiveDesignerChanged += new ActiveDesignerEventHandler(this.OnActiveDesignerEvent);
}

private void OnActiveDesignerEvent(object sender, ActiveDesignerEventArgs e)
{
    // Displays changed designer information on the console.
    if( e.NewDesigner.RootComponent.Site != null )
        Console.WriteLine("Name of the component of the new active designer: "+e.NewDesigner.RootComponent.Site.Name);
    Console.WriteLine("Type of the component of the new active designer: "+e.NewDesigner.RootComponentClassName);
    if( e.OldDesigner.RootComponent.Site != null )
        Console.WriteLine("Name of the component of the previously active designer: "+e.OldDesigner.RootComponent.Site.Name);
    Console.WriteLine("Type of the component of the previously active designer: "+e.OldDesigner.RootComponentClassName);
}

Public Sub LinkActiveDesignerEvent(ByVal eventService As IDesignerEventService)
    ' Registers an event handler for the ActiveDesignerChanged event.
    AddHandler eventService.ActiveDesignerChanged, AddressOf Me.OnActiveDesignerEvent
End Sub

Private Sub OnActiveDesignerEvent(ByVal sender As Object, ByVal e As ActiveDesignerEventArgs)
    ' Displays changed designer information on the console.            
    If (e.NewDesigner.RootComponent.Site IsNot Nothing) Then
        Console.WriteLine(("Name of the component of the new active designer: " + e.NewDesigner.RootComponent.Site.Name))
    End If
    Console.WriteLine(("Type of the component of the new active designer: " + e.NewDesigner.RootComponentClassName))
    If (e.OldDesigner.RootComponent.Site IsNot Nothing) Then
        Console.WriteLine(("Name of the component of the previously active designer: " + e.OldDesigner.RootComponent.Site.Name))
    End If
    Console.WriteLine(("Type of the component of the previously active designer: " + e.OldDesigner.RootComponentClassName))
End Sub

Remarques

L’événement ActiveDesignerChanged est déclenché lorsque le document actif a été modifié.

Lorsque vous créez un délégué ActiveDesignerEventHandler, vous identifiez la méthode qui gérera l'événement. Pour associer l'événement au gestionnaire d'événements, ajoutez une instance du délégué à l'événement. Le gestionnaire d'événements est appelé chaque fois qu'un événement se produit, sauf si vous supprimez le délégué. Pour plus d’informations sur les délégués du gestionnaire d’événements, consultez Gestion et levée d’événements.

Méthodes d’extension

GetMethodInfo(Delegate)

Obtient un objet qui représente la méthode représentée par le délégué spécifié.

Voir aussi

• ActiveDesignerEventArgs
• ActiveDesignerChanged