c#-4.0 - 启动 ManagementEventWatcher 时未发现异常

Question

启动 MaagementEventWatcher 时有时会出现未发现异常

我的代码示例如下:

 try
        {
            string scopePath = @"\\.\root\default";
            ManagementScope managementScope = new ManagementScope(scopePath);
            WqlEventQuery query =
                new WqlEventQuery(
                    "SELECT * FROM RegistryKeyChangeEvent WHERE " + "Hive = 'HKEY_LOCAL_MACHINE'"
                    + @"AND KeyPath = 'HARDWARE\\DEVICEMAP\\SERIALCOMM'");
            registryWatcher = new ManagementEventWatcher(managementScope, query);
            registryWatcher.EventArrived += new EventArrivedEventHandler(SerialCommRegistryUpdated);

            registryWatcher.Start();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
            if (registryWatcher != null)
            {
                registryWatcher.Stop();
            }
        }

异常:

  Not found
  at System.Management.ManagementException.ThrowWithExtendedInfo(ManagementStatus errorCode)
  at System.Management.ManagementEventWatcher.Start()
  at MTTS.LabX.RockLog.AppService.USBMonitor.AddRegistryWatcherHandler()]

注意:我检查了注册表，找到了文件夹和文件。

Answer 1

当 WQL 查询中不匹配时，将引发 ManagementException“未找到”。也许您指定了错误的 KeyPath 或者 KeyPath 不再可用。