ContentElement.PreviewDragOver 事件


在輸入系統回報以此項目作為可能置放目標的基礎拖曳事件時發生。Occurs when the input system reports an underlying drag event with this element as the potential drop target.

 event System::Windows::DragEventHandler ^ PreviewDragOver;
public event System.Windows.DragEventHandler PreviewDragOver;
member this.PreviewDragOver : System.Windows.DragEventHandler 
Public Custom Event PreviewDragOver As DragEventHandler 


這個事件會為這個類別建立 DragDrop.PreviewDragOver 附加事件的別名,因此,當 ContentElement 繼承為基底專案時,PreviewDragOver 就是類別成員清單的一部分。This event creates an alias for the DragDrop.PreviewDragOver attached event for this class, so that PreviewDragOver is part of the class members list when ContentElement is inherited as a base element. 附加至 PreviewDragOver 事件的事件處理常式會附加至基礎 DragDrop.PreviewDragOver 附加事件,並接收相同的事件資料實例。Event handlers that are attached to the PreviewDragOver event are attached to the underlying DragDrop.PreviewDragOver attached event and receive the same event data instance.

路由事件資訊Routed Event Information

識別碼欄位Identifier field PreviewDragOverEvent
路由策略Routing strategy 通道Tunneling
Delegate - 委派Delegate DragEventHandler
  • 對應的反升事件為 DragOverThe corresponding bubbling event is DragOver.

  • 覆寫 OnPreviewDragOver,以在衍生類別中為這個事件執行類別處理。Override OnPreviewDragOver to implement class handling for this event in derived classes.