我有这个实现了IDisposable的对象PreloadClient，我想处理它，但是在异步方法完成它们的调用之后...这并没有发生privatevoidPreload(SlideHandlerslide){using(PreloadClientclient=newPreloadClient()){client.PreloadCompleted+=client_PreloadCompleted;client.Preload(slide);}//Hereclientisdisposedimmediately}privatevoidclient_PreloadCompleted(objec