怪事~

   private void Form1_Load(object sender, EventArgs e)
        {
            ConnectionOptions co = new ConnectionOptions();
            co.Impersonation = ImpersonationLevel.Impersonate;
            co.EnablePrivileges = true;
            ManagementScope mgrScope = new ManagementScope(@"\\.\root\default", co);
            WqlEventQuery evQuery = new WqlEventQuery();
            evQuery.WithinInterval = new TimeSpan(0, 0, 0, 15, 0);
            //evQuery.QueryString = @"Select * From RegistryKeyChangeEvent Where Hive='HKEY_USERS' And KeyPath='S-1-5-21-3743974248-512206057-3529231067-1000\\Software\\Microsoft\\Internet Explorer\\Main'";//①
            evQuery.QueryString = @"Select * From RegistryKeyChangeEvent Where Hive='HKEY_USERS' And KeyPath='" + GetUserSID() + "\\Software\\Microsoft\\Internet Explorer\\Main'";//②

            ManagementEventWatcher RegKeyWacher = new ManagementEventWatcher();
            RegKeyWacher.Query = evQuery;
            RegKeyWacher.EventArrived += new EventArrivedEventHandler(OnRegistryKeyChange);
            RegKeyWacher.Scope = mgrScope;
            RegKeyWacher.Start();

        
        }

        private string GetUserSID()
        {
            string strUserSID = "";
            ConnectionOptions co = new ConnectionOptions();
            co.Impersonation = ImpersonationLevel.Impersonate;
            co.EnablePrivileges = true;
            ManagementScope mgrScope = new ManagementScope("\\\\.\\root\\cimv2", co);
            ObjectQuery myQuery = new ObjectQuery("SELECT * FROM Win32_UserAccount WHERE Domain=\"" + Environment.UserDomainName + "\"" + " And Name=\"" + Environment.UserName + "\"");
            ManagementObjectSearcher searcher = new ManagementObjectSearcher(mgrScope, myQuery);
            ManagementObjectCollection oReturnCollection = searcher.Get();
            foreach (ManagementObject sid in oReturnCollection)
            {
                strUserSID = sid["SID"].ToString();
            }
            return strUserSID;
        }

 

运行完①②之后，evQuery.QueryString 的值都是一样的，但①可以正常监视，但②RegKeyWacher.Start()的总是时候异常!!怪事！