拖放-拖放/拖放事件继续射击

I have a drag/drop operation on a Canvas that is supposed to do something when an object gets dragged into and out of it. My problem is that the DragEnter/DragLeave events keeps firing as the mouse moves the object over it, not just on enter/exit. The faster the mouse is moving, the more frequently the events fire.I have a drag/drop operation on a Canvas that i