ManagementObject 如何刷新
string queryString = @"SELECT * FROM Win32_PnPSignedDriver WHERE DeviceClass='PORTS'";
SelectQuery selectQuery = new SelectQuery(queryString);
ManagementObjectSearcher searcher = new ManagementObjectSearcher(selectQuery);
用上面的方法查询USB转串口,发现USB 都拔下了,查询USB设备还在,这个问题怎么解决