一般普通控件：
在主窗体（MianWindow）窗体中重写OnKeyDown事件
protected override void OnKeyDown(KeyEventArgs e)
{
if (e.Key == Key.Enter)
{ // MoveFocus takes a TraveralReqest as its argument.
TraversalRequest request = new TraversalRequest(FocusNavigationDirection.Next);
// Gets the element with keyboard focus.
UIElement elementWithFocus = Keyboard.FocusedElement as UIElement;
// Change keyboard focus.
if (elementWithFocus != null)
{
elementWithFocus.MoveFocus(request);
}
e.Handled = true;
}
base.OnKeyDown(e);
}
特殊的控件，如DatePicker控件上面事件是不会响应的，要自己在App.xaml.cs文件中重写OnStartup事件，并且重写注册键盘按下去事件
protected override void OnStartup(StartupEventArgs e)
{
base.OnStartup(e);
EventManager.RegisterClassHandler(typeof(DatePicker),
DatePicker.PreviewKeyDownEvent,
new KeyEventHandler(DatePicker_PreviewKeyDown));
}
private void DatePicker_PreviewKeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter)
{ // MoveFocus takes a TraveralReqest as its argument.
TraversalRequest request = new TraversalRequest(FocusNavigationDirection.Next);
// Gets the element with keyboard focus.
UIElement elementWithFocus = Keyboard.FocusedElement as UIElement;
// Change keyboard focus.
if (elementWithFocus != null)
{
elementWithFocus.MoveFocus(request);
}
e.Handled = true;
}
}