ComponentChangedEventHandler Délégué

Définition

public delegate void ComponentChangedEventHandler(System::Object ^ sender, ComponentChangedEventArgs ^ e);

public delegate void ComponentChangedEventHandler(object sender, ComponentChangedEventArgs e);

public delegate void ComponentChangedEventHandler(object? sender, ComponentChangedEventArgs e);

[System.Runtime.InteropServices.ComVisible(true)]
public delegate void ComponentChangedEventHandler(object sender, ComponentChangedEventArgs e);

type ComponentChangedEventHandler = delegate of obj * ComponentChangedEventArgs -> unit

[<System.Runtime.InteropServices.ComVisible(true)>]
type ComponentChangedEventHandler = delegate of obj * ComponentChangedEventArgs -> unit

Public Delegate Sub ComponentChangedEventHandler(sender As Object, e As ComponentChangedEventArgs)

Paramètres

Attributs

ComVisibleAttribute

Exemples

Cet exemple illustre l’inscription d’un et la ComponentChangedEventHandler gestion de l’événement ComponentChanged .

public:
   void LinkComponentChangedEvent( IComponentChangeService^ changeService )
   {
      // Registers an event handler for the ComponentChanged event.
      changeService->ComponentChanged += gcnew ComponentChangedEventHandler(
         this, &ComponentChangedEventHandlerExample::OnComponentChanged );
   }

private:
   void OnComponentChanged( Object^ sender, ComponentChangedEventArgs^ e )
   {
      // Displays changed component information on the console.
      Console::WriteLine( "Type of the component that has changed: " +
         e->Component->GetType()->FullName );
      Console::WriteLine( "Name of the member of the component that has changed: " +
         e->Member->Name );
      Console::WriteLine( "Old value of the member: " + e->OldValue );
      Console::WriteLine( "New value of the member: " + e->NewValue );
   }

public void LinkComponentChangedEvent(IComponentChangeService changeService)
{
    // Registers an event handler for the ComponentChanged event.
    changeService.ComponentChanged += new ComponentChangedEventHandler(this.OnComponentChanged);            
}

private void OnComponentChanged(object sender, ComponentChangedEventArgs e)
{
    // Displays changed component information on the console.
    Console.WriteLine("Type of the component that has changed: "+e.Component.GetType().FullName);      
    Console.WriteLine("Name of the member of the component that has changed: "+e.Member.Name);            
    Console.WriteLine("Old value of the member: "+e.OldValue.ToString());
    Console.WriteLine("New value of the member: "+e.NewValue.ToString());
}

Public Sub LinkComponentChangedEvent(ByVal changeService As IComponentChangeService)
    ' Registers an event handler for the ComponentChanged event.
    AddHandler changeService.ComponentChanged, AddressOf Me.OnComponentChanged
End Sub

Private Sub OnComponentChanged(ByVal sender As Object, ByVal e As ComponentChangedEventArgs)
    ' Displays changed component information on the console.            
    Console.WriteLine(("Type of the component that has changed: " + e.Component.GetType().FullName))
    Console.WriteLine(("Name of the member of the component that has changed: " + e.Member.Name))
    Console.WriteLine(("Old value of the member: " + e.OldValue.ToString()))
    Console.WriteLine(("New value of the member: " + e.NewValue.ToString()))
End Sub

Remarques

Lorsque vous créez un délégué ComponentChangedEventHandler, 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 de gestionnaire d’événements, consultez Gestion et déclenchement d’événements.

Un ComponentChanged événement ne se produit pas pendant le chargement ou le déchargement d’un formulaire, car des modifications sont attendues au cours de ces opérations.

Méthodes d’extension

S’applique à

Voir aussi

• ComponentChanged
• ComponentChanging
• ComponentChangedEventArgs
• IComponentChangeService