DispatcherTimer.Tick Evento

Definizione

Spazio dei nomi:

System.Windows.Threading

Assembly:

WindowsBase.dll

Si verifica al termine dell'intervallo del timer.

public:
 event EventHandler ^ Tick;

public event EventHandler Tick;

member this.Tick : EventHandler 

Public Custom Event Tick As EventHandler 

Tipo evento

EventHandler

Esempio

Nell'esempio seguente viene creato un Tick gestore eventi. Il gestore eventi aggiorna un Label oggetto che visualizza il secondo corrente e chiama InvalidateRequerySuggested su CommandManager.

//  System.Windows.Threading.DispatcherTimer.Tick handler
//
//  Updates the current seconds display and calls
//  InvalidateRequerySuggested on the CommandManager to force 
//  the Command to raise the CanExecuteChanged event.
private void dispatcherTimer_Tick(object sender, EventArgs e)
{
    // Updating the Label which displays the current second
    lblSeconds.Content = DateTime.Now.Second;

    // Forcing the CommandManager to raise the RequerySuggested event
    CommandManager.InvalidateRequerySuggested();
}

'  System.Windows.Threading.DispatcherTimer.Tick handler
'
'  Updates the current seconds display and calls
'  InvalidateRequerySuggested on the CommandManager to force 
'  the Command to raise the CanExecuteChanged event.
Private Sub dispatcherTimer_Tick(ByVal sender As Object, ByVal e As EventArgs)
    ' Updating the Label which displays the current second
    lblSeconds.Content = Date.Now.Second

    ' Forcing the CommandManager to raise the RequerySuggested event
    CommandManager.InvalidateRequerySuggested()
End Sub