DesignerTransactionCloseEventHandler Делегат

Определение

public delegate void DesignerTransactionCloseEventHandler(System::Object ^ sender, DesignerTransactionCloseEventArgs ^ e);

public delegate void DesignerTransactionCloseEventHandler(object sender, DesignerTransactionCloseEventArgs e);

public delegate void DesignerTransactionCloseEventHandler(object? sender, DesignerTransactionCloseEventArgs e);

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

type DesignerTransactionCloseEventHandler = delegate of obj * DesignerTransactionCloseEventArgs -> unit

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

Public Delegate Sub DesignerTransactionCloseEventHandler(sender As Object, e As DesignerTransactionCloseEventArgs)

Параметры

Атрибуты

ComVisibleAttribute

Примеры

В следующем примере демонстрируется DesignerTransactionCloseEventHandler регистрация и обработка TransactionClosing событий и TransactionClosed .

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. Чтобы связать событие с обработчиком событий, нужно добавить в событие экземпляр делегата. Обработчик событий вызывается всякий раз, когда происходит событие, если делегат не удален. Дополнительные сведения о делегатах обработчика событий см. в разделе Обработка и вызов событий.

Методы расширения

Применяется к

См. также раздел

• IDesignerHost