DesignerTransactionCloseEventHandler Делегат

Определение

Представляет метод, обрабатывающий события конструктора TransactionClosed и TransactionClosing.Represents the method that handles the TransactionClosed and TransactionClosing events of a designer.

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

Параметры

sender
Object

Источник события.The source of the event.

e
DesignerTransactionCloseEventArgs

Объект DesignerTransactionCloseEventArgs, содержащий данные, которые относятся к событию.A DesignerTransactionCloseEventArgs that contains the event data.

Наследование
DesignerTransactionCloseEventHandler
Атрибуты

Примеры

В следующем примере демонстрируется регистрация DesignerTransactionCloseEventHandler и TransactionClosing обработка событий и TransactionClosed .The following example demonstrates registering a DesignerTransactionCloseEventHandler and handling the TransactionClosing and TransactionClosed events.

public:
   void LinkDesignerTransactionCloseEvent( IDesignerHost^ host )
   {
      // Registers an event handler for the designer TransactionClosing and TransactionClosed events.
      host->TransactionClosing += gcnew DesignerTransactionCloseEventHandler(
         this, &DesignerTransactionCloseEventHandlerExample::OnTransactionClose );
      host->TransactionClosed += gcnew DesignerTransactionCloseEventHandler(
         this, &DesignerTransactionCloseEventHandlerExample::OnTransactionClose );
   }

private:
   void OnTransactionClose( Object^ sender, DesignerTransactionCloseEventArgs^ e )
   {
      // Displays transaction close information on the console.
      if ( e->TransactionCommitted )
      {
         Console::WriteLine( "Transaction has been committed." );
      }
      else
      {
         Console::WriteLine( "Transaction has not yet been committed." );
      }
   }
public void LinkDesignerTransactionCloseEvent(IDesignerHost host)
{                       
    // Registers an event handler for the designer TransactionClosing and TransactionClosed events.
    host.TransactionClosing += new DesignerTransactionCloseEventHandler(this.OnTransactionClose);
    host.TransactionClosed += new DesignerTransactionCloseEventHandler(this.OnTransactionClose);
}

private void OnTransactionClose(object sender, DesignerTransactionCloseEventArgs e)
{
    // Displays transaction close information on the console.           
    if( e.TransactionCommitted )            
        Console.WriteLine("Transaction has been committed.");
    else
        Console.WriteLine("Transaction has not yet been committed.");
}
Public Sub LinkDesignerTransactionCloseEvent(ByVal host As IDesignerHost)
    ' Registers an event handler for the designer TransactionClosing 
    ' and TransactionClosed events.
    AddHandler host.TransactionClosing, AddressOf Me.OnTransactionClose
    AddHandler host.TransactionClosed, AddressOf Me.OnTransactionClose
End Sub

Private Sub OnTransactionClose(ByVal sender As Object, ByVal e As DesignerTransactionCloseEventArgs)
    ' Displays transaction close information on the console.           
    If e.TransactionCommitted Then
        Console.WriteLine("Transaction has been committed.")
    Else
        Console.WriteLine("Transaction has not yet been committed.")
    End If
End Sub

Комментарии

При создании делегата DesignerTransactionCloseEventHandler необходимо указать метод, обрабатывающий событие.When you create a DesignerTransactionCloseEventHandler delegate, you identify the method that will handle the event. Чтобы связать событие с обработчиком событий, нужно добавить в событие экземпляр делегата.To associate the event with your event handler, add an instance of the delegate to the event. Обработчик событий вызывается всякий раз, когда происходит событие, если делегат не удален.The event handler is called whenever the event occurs, unless you remove the delegate. Дополнительные сведения о делегатах обработчиков событий см. в разделе обработка и вызов событий.For more information about event-handler delegates, see Handling and Raising Events.

Методы расширения

GetMethodInfo(Delegate)

Получает объект, представляющий метод, представленный указанным делегатом.Gets an object that represents the method represented by the specified delegate.

Применяется к

Дополнительно