Keyboard.PreviewKeyDown 附加事件
定義
按下鍵盤上的按鍵時發生。Occurs when a key on the keyboard is pressed.
see AddPreviewKeyDownHandler, and RemovePreviewKeyDownHandlersee AddPreviewKeyDownHandler, and RemovePreviewKeyDownHandlersee AddPreviewKeyDownHandler, and RemovePreviewKeyDownHandler備註
這是附加事件。This is an attached event. WPFWPF 將附加事件實作為路由事件。implements attached events as routed events. 附加事件基本上是一種 XAMLXAML 語言概念，可參考可在未定義該事件的物件上處理的事件，也就是藉 WPFWPF 由同時啟用事件來跨越路由進行擴充。Attached events are fundamentally a XAMLXAML language concept for referencing events that can be handled on objects that do not define that event, which WPFWPF expands upon by also enabling the event to traverse a route. 附加事件在程式碼中沒有直接處理語法;若要在程式碼中附加路由事件的處理常式，您可以使用指定的 Add * 處理常式方法。Attached events do not have a direct handling syntax in code; to attach handlers for a routed event in code, you use a designated Add*Handler method. 如需詳細資訊，請參閱 附加事件總覽。For details, see Attached Events Overview.
路由事件資訊Routed Event Information
| 識別碼欄位Identifier field | PreviewKeyDownEvent |
| 路由策略Routing strategy | 隧道Tunneling |
| 代理人Delegate | KeyEventHandler |