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ComponentEventHandler Delegado

  • Referencia

Definición

Espacio de nombres:
System.ComponentModel.Design
Ensamblado:
System.ComponentModel.TypeConverter.dll
Ensamblado:
System.dll
Ensamblado:
netstandard.dll

Representa el método que controlará los eventos ComponentAdding, ComponentAdded, ComponentRemoving y ComponentRemoved provocados para eventos de nivel de componente.

public delegate void ComponentEventHandler(System::Object ^ sender, ComponentEventArgs ^ e);
public delegate void ComponentEventHandler(object sender, ComponentEventArgs e);
public delegate void ComponentEventHandler(object? sender, ComponentEventArgs e);
[System.Runtime.InteropServices.ComVisible(true)]
public delegate void ComponentEventHandler(object sender, ComponentEventArgs e);
type ComponentEventHandler = delegate of obj * ComponentEventArgs -> unit
[<System.Runtime.InteropServices.ComVisible(true)>]
type ComponentEventHandler = delegate of obj * ComponentEventArgs -> unit
Public Delegate Sub ComponentEventHandler(sender As Object, e As ComponentEventArgs)

Parámetros

sender
Object

Origen del evento.

e
ComponentEventArgs

Objeto ComponentEventArgs que contiene los datos del evento.

Atributos
ComVisibleAttribute

Ejemplos

En el ejemplo siguiente se muestra cómo registrar y ComponentEventHandler controlar los ComponentAddedeventos , ComponentAddingComponentRemoved y ComponentRemoving .

public:
   void LinkComponentEvent( IComponentChangeService^ changeService )
   {
      // Registers an event handler for the ComponentAdded,
      // ComponentAdding, ComponentRemoved, and ComponentRemoving events.
      changeService->ComponentAdded += gcnew ComponentEventHandler(
         this, &ComponentEventHandlerExample::OnComponentEvent );
      changeService->ComponentAdding += gcnew ComponentEventHandler(
         this, &ComponentEventHandlerExample::OnComponentEvent );
      changeService->ComponentRemoved += gcnew ComponentEventHandler(
         this, &ComponentEventHandlerExample::OnComponentEvent );
      changeService->ComponentRemoving += gcnew ComponentEventHandler(
         this, &ComponentEventHandlerExample::OnComponentEvent );
   }

private:
   void OnComponentEvent( Object^ sender, ComponentEventArgs^ e )
   {
      // Displays changed component information on the console.
      if ( e->Component->Site != nullptr )
      {
         Console::WriteLine( "Name of the component related to the event: " +
            e->Component->Site->Name );
      }
      Console::WriteLine( "Type of the component related to the event: " +
         e->Component->GetType()->FullName );
   }

public void LinkComponentEvent(IComponentChangeService changeService)
{
    // Registers an event handler for the ComponentAdded,
    // ComponentAdding, ComponentRemoved, and ComponentRemoving events.
    changeService.ComponentAdded += new ComponentEventHandler(this.OnComponentEvent);            
    changeService.ComponentAdding += new ComponentEventHandler(this.OnComponentEvent);            
    changeService.ComponentRemoved += new ComponentEventHandler(this.OnComponentEvent);            
    changeService.ComponentRemoving += new ComponentEventHandler(this.OnComponentEvent);                        
}

private void OnComponentEvent(object sender, ComponentEventArgs e)
{
    // Displays changed component information on the console.            
    if( e.Component.Site != null )
        Console.WriteLine("Name of the component related to the event: "+e.Component.Site.Name);      
    Console.WriteLine("Type of the component related to the event: "+e.Component.GetType().FullName);
}

Public Sub LinkComponentEvent(ByVal changeService As IComponentChangeService)
    ' Registers an event handler for the ComponentAdded,
    ' ComponentAdding, ComponentRemoved, and ComponentRemoving events.
    AddHandler changeService.ComponentAdded, AddressOf Me.OnComponentEvent
    AddHandler changeService.ComponentAdding, AddressOf Me.OnComponentEvent
    AddHandler changeService.ComponentRemoved, AddressOf Me.OnComponentEvent
    AddHandler changeService.ComponentRemoving, AddressOf Me.OnComponentEvent
End Sub

Private Sub OnComponentEvent(ByVal sender As Object, ByVal e As ComponentEventArgs)
    ' Displays changed component information on the console.            
    If (e.Component.Site IsNot Nothing) Then
        Console.WriteLine(("Name of the component related to the event: " + e.Component.Site.Name))
    End If
End Sub

Comentarios

Cuando se crea un delegado ComponentEventHandler, se identifica el método que controlará el evento. Para asociar el evento al controlador, se debe agregar una instancia del delegado al evento. Siempre que se produce el evento, se llama a su controlador, a menos que se quite el delegado. Para obtener más información sobre los delegados del controlador de eventos, vea Control y generación de eventos.

Métodos de extensión

GetMethodInfo(Delegate)

Obtiene un objeto que representa el método representado por el delegado especificado.

Se aplica a

Consulte también