ComponentChangingEventHandler Delegar

Definição

Namespace:

System.ComponentModel.Design

Assembly:

System.ComponentModel.TypeConverter.dll

Representa o método que irá manipular um evento de ComponentChanging .

public delegate void ComponentChangingEventHandler(System::Object ^ sender, ComponentChangingEventArgs ^ e);

public delegate void ComponentChangingEventHandler(object? sender, ComponentChangingEventArgs e);

type ComponentChangingEventHandler = delegate of obj * ComponentChangingEventArgs -> unit

Public Delegate Sub ComponentChangingEventHandler(sender As Object, e As ComponentChangingEventArgs)

Parâmetros

sender

Object

A fonte do evento.

e

ComponentChangingEventArgs

Um evento ComponentChangingEventArgs que contém os dados do evento.

Exemplos

Este exemplo demonstra como registrar um ComponentChangingEventHandler e manipular o ComponentChanging evento.

public:
   void LinkComponentChangingEvent( IComponentChangeService^ changeService )
   {
      // Registers an event handler for the ComponentChanging event.
      changeService->ComponentChanging += gcnew ComponentChangingEventHandler(
         this, &ComponentChangingEventHandlerExample::OnComponentChanging );
   }

private:
   void OnComponentChanging( Object^ sender, ComponentChangingEventArgs^ e )
   {
      // Displays changing component information on the console.
      Console::WriteLine( "Type of the component that is about to change: " +
         e->Component->GetType()->FullName );
      Console::WriteLine( "Name of the member of the component that is about to change: " +
         e->Member->Name );
   }

public void LinkComponentChangingEvent(IComponentChangeService changeService)
{
    // Registers an event handler for the ComponentChanging event.
    changeService.ComponentChanging += new ComponentChangingEventHandler(this.OnComponentChanging);            
}

private void OnComponentChanging(object sender, ComponentChangingEventArgs e)
{
    // Displays changing component information on the console.
    Console.WriteLine("Type of the component that is about to change: "+e.Component.GetType().FullName);      
    Console.WriteLine("Name of the member of the component that is about to change: "+e.Member.Name);                        
}

Public Sub LinkComponentChangingEvent(ByVal changeService As IComponentChangeService)
    ' Registers an event handler for the ComponentChanging event.
    AddHandler changeService.ComponentChanging, AddressOf Me.OnComponentChanging
End Sub

Private Sub OnComponentChanging(ByVal sender As Object, ByVal e As ComponentChangingEventArgs)
    ' Displays changing component information on the console.
    Console.WriteLine(("Type of the component that is about to change: " + e.Component.GetType().FullName))
    Console.WriteLine(("Name of the member of the component that is about to change: " + e.Member.Name))
End Sub

Comentários

Ao criar um ComponentChangingEventHandler delegado, você identifica o método que manipulará o evento. Para associar o evento ao manipulador de eventos, adicione uma instância do delegado ao evento. O manipulador de eventos é chamado sempre que o evento ocorre, a menos que você remova o representante. Para obter mais informações sobre delegados do manipulador de eventos, consulte Manipulando e gerando eventos.

Métodos de Extensão

GetMethodInfo(Delegate)

Obtém um objeto que representa o método representado pelo delegado especificado.

Confira também

• ComponentChanging
• ComponentChanged
• ComponentChangingEventArgs
• IComponentChangeService