ManagementScope 类在System.Management（在 system.management.dll 中）public class CheckPrinterState    {        public static bool CheckPrinter(string printerName1)        {            ManagementScope scope = new ManagementScope(@"\root\cimv2");            scope.Connect();            // Select Printers from WMI Object Collections            ManagementObjectSearcher searcher = new             ManagementObjectSearcher("SELECT * FROM Win32_Printer");            string printerName = "";            foreach (ManagementObject printer in searcher.Get())            {                printerName = printer["Name"].ToString().ToLower();                if (printerName.IndexOf(printerName1.ToLower()) > -1)                {                                       if (printer["WorkOffline"].ToString().ToLower().Equals("true"))                    {                        return false;                        // printer is offline by user                                           }                    else                    {                        // printer is not offline                                               return true;                    }                }            }            return false;        }    }