ISelectionService.SelectionChanging Zdarzenie

Definicja

Przestrzeń nazw:

System.ComponentModel.Design

Zestaw:

System.ComponentModel.TypeConverter.dll

Występuje, gdy bieżące zaznaczenie ma ulec zmianie.

public:
 event EventHandler ^ SelectionChanging;

event EventHandler SelectionChanging;

member this.SelectionChanging : EventHandler 

Event SelectionChanging As EventHandler 

Typ zdarzenia

EventHandler

Przykłady

W poniższym przykładzie pokazano, jak używać SelectionChanging zdarzenia.

// Add SelectionChanging event handler to event
m_selectionService->SelectionChanging += gcnew EventHandler( this, &ComponentClass::OnSelectionChanging );

// Add SelectionChanging event handler to event
m_selectionService.SelectionChanging += new EventHandler(OnSelectionChanging);

' Add SelectionChanging event handler to event
AddHandler m_selectionService.SelectionChanging, AddressOf OnSelectionChanging

/* This is the OnSelectionChanging handler method.  This method calls
    OnUserChange to display a message that indicates the name of the
    handler that made the call and the type of the event argument. */
void OnSelectionChanging( Object^ /*sender*/, EventArgs^ args )
{
   OnUserChange( "OnSelectionChanging", args->ToString() );
}

/* This is the OnSelectionChanging handler method.  This method calls
    OnUserChange to display a message that indicates the name of the
    handler that made the call and the type of the event argument. */
private void OnSelectionChanging(object sender, EventArgs args) 
{
    OnUserChange("OnSelectionChanging", args.ToString());
}

' This is the OnSelectionChanging handler method.  This method calls
'   OnUserChange to display a message that indicates the name of the
'   handler that made the call and the type of the event argument. 
 Private Sub OnSelectionChanging(ByVal sender As Object, ByVal args As EventArgs)
    OnUserChange("OnSelectionChanging", args.ToString())
 End Sub

Uwagi

Zminimalizowanie przetwarzania podczas obsługi tego zdarzenia, ponieważ przetwarzanie wykonywane w ramach tej procedury obsługi zdarzeń może znacząco wpłynąć na ogólną wydajność projektanta formularzy.

Zobacz też

• SelectionChanged
• EventHandler