ToolStripItem.IDropTarget.OnDragOver(DragEventArgs) 方法

定義

引發 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);
abstract member System.Windows.Forms.IDropTarget.OnDragOver : System.Windows.Forms.DragEventArgs -> unit
override this.System.Windows.Forms.IDropTarget.OnDragOver : System.Windows.Forms.DragEventArgs -> unit
Sub OnDragOver (dragEvent As DragEventArgs) Implements IDropTarget.OnDragOver

參數

dragEvent
DragEventArgs

包含事件資料的 DragEventArgsA DragEventArgs that contains the event data.

實作

備註

引發事件會透過委派叫用此事件處理常式。Raising an event invokes the event handler through a delegate. 如需詳細資訊,請參閱處理和引發事件For more information, see Handling and Raising Events.

IDropTarget.OnDragOver 方法也允許衍生類別處理事件,而不用附加委派。The IDropTarget.OnDragOver method also allows derived classes to handle the event without attaching a delegate. 這是在衍生類別中處理事件的慣用技巧。This is the preferred technique for handling the event in a derived class.

給繼承者的注意事項

覆寫衍生類別中的 IDropTarget.OnDragOver(DragEventArgs) 時,請務必呼叫基類的 IDropTarget.OnDragOver(DragEventArgs) 方法,讓已註冊的委派能接收事件。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.

適用於