我一直在编写一些代码来检测USB设备的添加和移除，并且我使用以下WMI代码来注册设备更改通知:watcher=newManagementEventWatcher(query);watcher.EventArrived+=newEventArrivedEventHandler(DeviceChangeEventReceived);watcher.Start();这是处理程序代码:voidDeviceChangeEventReceived(objectsender,EventArrivedEventArgse){foreach(PropertyDatapdine.NewEvent.Prop