public class CDROM_Listener
{
   
   public static void Test()
   {
      CDROM_Listener listener = new CDROM_Listener();
      ManagementEventWatcher watcher = null;
      WqlEventQuery query = null;//表示 WQL 格式的 WMI 事件查询。
      ManagementOperationObserver observer = new ManagementOperationObserver(); //系统管理操作观察者
      
      // 绑定本机机器
      ConnectionOptions opt = new ConnectionOptions();
      opt.EnablePrivileges = true; //是否需要为连接操作启用用户特权。
      ManagementScope scope = new ManagementScope("root\\CIMV2", opt);//设置监控范围
      
      try
      {
         query = new WqlEventQuery();
         query.EventClassName = "__InstanceModificationEvent";
         query.WithinInterval = new TimeSpan(0, 0, 1);
         
         // DriveType - 5: CDROM
         query.Condition = @"TargetInstance ISA ’Win32_LogicalDisk’ and TargetInstance.DriveType=5";
         watcher = new ManagementEventWatcher(scope, query);
         
         //绑定事件
         watcher.EventArrived += new EventArrivedEventHandler(listener.CDREventArrived);
         watcher.Start(); //开始监听...
      }
      catch (Exception e)
      {
         MessageBox.Show(e.Message);
      }
      finally
      {
         // watcher.Stop(); //停止监听
      }
   }
   
   // 触发光驱事件
   public void CDREventArrived(object sender, EventArrivedEventArgs e)
   {
      PropertyData pd = e.NewEvent.Properties["TargetInstance"];
      
      if (pd != null)
      {
         ManagementBaseObject mbo = pd.Value as ManagementBaseObject;
         
         if (mbo.Properties["VolumeName"].Value != null)
         {
            MessageBox.Show("已经插入光盘");
         }
         else
         {
            MessageBox.Show("已经弹出光盘");
         }
      }
   }
}