设置默认打印机

  /// <summary>
        /// 设置默认打印机
        /// </summary>
        /// <param name="name"></param>
        public bool SetDefaultPrinter(string name)
        {
            bool val = false;
            string PrinterName = ConfigurationManager.AppSettings[name];
            if (!string.IsNullOrEmpty(PrinterName))
            {
                ManagementObjectSearcher query;
                ManagementObjectCollection queryCollection;
                string _classname = "SELECT * FROM Win32_Printer";

                query = new ManagementObjectSearcher(_classname);
                queryCollection = query.Get();

                foreach (ManagementObject mo in queryCollection)
                {
                    string a = mo["Name"].ToString();

                    if (a.IndexOf(PrinterName) >= 0)
                    {
                        mo.InvokeMethod("SetDefaultPrinter", null);
                        val = true;
                        break;
                    }
                }
            }
            return val;
        }