UIElement.PreviewDrop 事件


輸入系統報告其下以這個項目作為置放目標的置放事件時發生。Occurs when the input system reports an underlying drop event with this element as the drop target.

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




此事件 DragDrop.PreviewDrop 會為這個類別建立附加事件的別名,因此 PreviewDropUIElement 繼承為基底專案時,它就是類別成員清單的一部分。This event creates an alias for the DragDrop.PreviewDrop attached event for this class, so that PreviewDrop is part of the class members list when UIElement is inherited as a base element. 附加至事件的事件處理常式 PreviewDrop 會附加至基礎 DragDrop.PreviewDrop 附加事件,並接收相同的事件資料實例。Event handlers that are attached to the PreviewDrop event are attached to the underlying DragDrop.PreviewDrop 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 PreviewDropEvent
路由策略Routing strategy 隧道Tunneling
代理人Delegate DragEventHandler
  • 對應的反升事件為 DropThe corresponding bubbling event is Drop.

  • OnPreviewDrop在衍生類別中覆寫以執行這個事件的類別處理。Override OnPreviewDrop to implement class handling for this event in derived classes.