ToolStripItem.IDropTarget.OnDragOver(DragEventArgs) ToolStripItem.IDropTarget.OnDragOver(DragEventArgs) ToolStripItem.IDropTarget.OnDragOver(DragEventArgs) Method

定义

引发 DragOver 事件。Raises the DragOver event.

 virtual void System.Windows.Forms.IDropTarget.OnDragOver(System::Windows::Forms::DragEventArgs ^ dragEvent) = System::Windows::Forms::IDropTarget::OnDragOver;
void IDropTarget.OnDragOver (System.Windows.Forms.DragEventArgs dragEvent);
Sub OnDragOver (dragEvent As DragEventArgs) Implements IDropTarget.OnDragOver

参数

dragEvent
DragEventArgs DragEventArgs DragEventArgs

包含事件数据的 DragEventArgsA DragEventArgs that contains the event data.

实现

注解

引发事件时,将通过委托调用事件处理程序。Raising an event invokes the event handler through a delegate. 有关详细信息, 请参阅处理和引发事件For more information, see Handling and Raising Events.

IDropTarget.OnDragOver 方法还允许派生类对事件进行处理而不必附加委托。The IDropTarget.OnDragOver method also allows derived classes to handle the event without attaching a delegate. 这是在派生类中处理事件的首选技术。This is the preferred technique for handling the event in a derived class.

继承者说明

当在IDropTarget.OnDragOver(DragEventArgs)派生类中重写时, 请确保调用基类的IDropTarget.OnDragOver(DragEventArgs)方法, 以便注册的委托接收事件。When overriding IDropTarget.OnDragOver(DragEventArgs) in a derived class, be sure to call the base class' IDropTarget.OnDragOver(DragEventArgs) method so that registered delegates receive the event.

适用于