DispatcherTimer.Tick 事件

定義

命名空間:

System.Windows.Threading

組件:

WindowsBase.dll

發生於計時器間隔已耗用時。

public:
 event EventHandler ^ Tick;

public event EventHandler Tick;

member this.Tick : EventHandler 

Public Custom Event Tick As EventHandler 

事件類型

EventHandler

範例

下列範例會 Tick 建立事件處理常式。 事件處理常式會更新 Label 顯示目前秒的 ，並在 上 CommandManager 呼叫 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 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