Control.OnQueryContinueDrag(QueryContinueDragEventArgs) 方法

定義

引發 QueryContinueDrag 事件。Raises the QueryContinueDrag event.

protected:
 virtual void OnQueryContinueDrag(System::Windows::Forms::QueryContinueDragEventArgs ^ qcdevent);
protected virtual void OnQueryContinueDrag (System.Windows.Forms.QueryContinueDragEventArgs qcdevent);
abstract member OnQueryContinueDrag : System.Windows.Forms.QueryContinueDragEventArgs -> unit
override this.OnQueryContinueDrag : System.Windows.Forms.QueryContinueDragEventArgs -> unit
Protected Overridable Sub OnQueryContinueDrag (qcdevent As QueryContinueDragEventArgs)

參數

qcdevent
QueryContinueDragEventArgs

QueryContinueDragEventArgs,其中包含事件資料。A QueryContinueDragEventArgs that contains the event data.

備註

開始拖曳之後,.NET Framework.NET Framework 會重複呼叫這個方法,直到取消或完成拖曳作業為止。After dragging has begun, this method is called repeatedly by the .NET Framework.NET Framework until the drag operation is either canceled or completed.

注意

如果您想要變更取消拖曳或發生卸載的點,請覆寫這個方法。Override this method if you want to change the point at which dragging is canceled or at which a drop occurs.

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.

OnQueryContinueDrag 方法也可讓衍生類別處理事件,而不需要附加委派。The OnQueryContinueDrag method also enables 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

當在衍生類別中覆寫 OnQueryContinueDrag(QueryContinueDragEventArgs) 時,請確定呼叫基底類別的 OnQueryContinueDrag(QueryContinueDragEventArgs) 方法,使已註冊的委派能接收到事件。When overriding OnQueryContinueDrag(QueryContinueDragEventArgs) in a derived class, be sure to call the base class's OnQueryContinueDrag(QueryContinueDragEventArgs) method so that registered delegates receive the event.

適用於

另請參閱