UIElement.PreviewDragOver 事件

定義

命名空間:
System.Windows
組件:
PresentationCore.dll

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.

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

事件類型

DragEventHandler

備註

此事件 DragDrop.PreviewDragOver 會為這個類別建立附加事件的別名，因此 PreviewDragOver 當 UIElement 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.PreviewDragOver attached event for this class, so that PreviewDragOver 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 PreviewDragOver 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 隧道Tunneling
代理人Delegate DragEventHandler

  • 對應的反升事件為 DragOver 。The corresponding bubbling event is DragOver.

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

適用於