UIElement.PreviewDrop 事件

定义

在输入系统报告出现将此元素作为放置目标的基础放置事件时发生。Occurs when the input system reports an underlying drop event with this element as the drop target.

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

注解

此事件创建此类的 DragDrop.PreviewDrop 附加事件的别名,以便在将 UIElement 作为基元素继承时,PreviewDrop 是类成员列表的一部分。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. 附加到 PreviewDrop 事件的事件处理程序附加到基础 DragDrop.PreviewDrop 附加事件,并接收相同的事件数据实例。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.

路由事件信息Routed Event Information

标识符字段Identifier field PreviewDropEvent
路由策略Routing strategy 隧道Tunneling
委托Delegate DragEventHandler
  • 对应的冒泡事件 DropThe corresponding bubbling event is Drop.

  • 重写 OnPreviewDrop 在派生类中实现此事件的类处理。Override OnPreviewDrop to implement class handling for this event in derived classes.

适用于