UIElement.PreviewDragEnter UIElement.PreviewDragEnter UIElement.PreviewDragEnter UIElement.PreviewDragEnter Event

定義

輸入系統報告其下以此項目作為拖曳目標的拖曳事件時發生。Occurs when the input system reports an underlying drag event with this element as the drag target.

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

備註

這個事件PreviewDragEnter會為這個類別建立DragDrop.PreviewDragEnter附加事件的別名, 因此當繼承為基底專案時UIElement , 就是類別成員清單的一部分。This event creates an alias for the DragDrop.PreviewDragEnter attached event for this class, so that PreviewDragEnter is part of the class members list when UIElement is inherited as a base element. 附加至PreviewDragEnter事件的事件處理常式會附加至基礎DragDrop.PreviewDragEnter附加事件, 並接收相同的事件資料實例。Event handlers that are attached to the PreviewDragEnter event are attached to the underlying DragDrop.PreviewDragEnter 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 PreviewDragEnterEvent
路由策略Routing strategy 建立Tunneling
Delegate - 委派Delegate DragEventHandler

適用於