/// <summary>
/// 设置IP 子网掩码、默认网关和DNS
/// </summary>
/// <param name="ip">IP</param>
/// <param name="subnetmask">子网掩码</param>
/// <param name="gateway">默认网关</param>
/// <param name="dns">DNS</param>
private bool SetNetworkAdapter(string ip, string subnetmask, string gateway, string dns, string mode)
        {
            bool success = true;
            ManagementBaseObject inPar = null;
            ManagementBaseObject outPar = null;
            ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc = mc.GetInstances();
            foreach (ManagementObject mo in moc)
            {
                if (mo["Description"].ToString().Trim() == lbCards.SelectedValue.ToString().Trim())
                {
                    if (!(bool)mo["IPEnabled"])
                    {
                        MessageBox.Show("已检测到网卡，但无法设置。请检查网卡优先性并确认是否已被禁用或已插网线。");
                        Process.Start("ncpa.cpl");//网络连接
                        break;
                    }
                    else
                    {
                        try
                        {
                            if (mode == "auto")
                            {
                                //重置DNS为空   
                                mo.InvokeMethod("SetDNSServerSearchOrder", null);
                                //开启DHCP   
                                mo.InvokeMethod("EnableDHCP", null);
                                success = true;
                                break;
                            }
                            else if (mode == "hand")
                            {
                                //设置ip地址和子网掩码 
                                inPar = mo.GetMethodParameters("EnableStatic");
                                inPar["IPAddress"] = new string[] { ip };// 1.备用 2.IP
                                inPar["SubnetMask"] = new string[] { subnetmask };
                                outPar = mo.InvokeMethod("EnableStatic", inPar, null);

                                //设置网关地址 
                                if (gateway.Equals(String.Empty))
                                {
                                    mo.InvokeMethod("SetGateways", null);
                                }
                                else
                                {
                                    inPar = mo.GetMethodParameters("SetGateways");
                                    inPar["DefaultIPGateway"] = new string[] { gateway }; // 1.网关;2.备用网关
                                    outPar = mo.InvokeMethod("SetGateways", inPar, null);
                                }

                                //设置DNS 
                                if (dns.Equals(String.Empty))
                                {
                                    mo.InvokeMethod("SetDNSServerSearchOrder", null);
                                }
                                else
                                {
                                    inPar = mo.GetMethodParameters("SetDNSServerSearchOrder");
                                    inPar["DNSServerSearchOrder"] = new string[] { dns }; // 1.DNS 2.备用DNS
                                    outPar = mo.InvokeMethod("SetDNSServerSearchOrder", inPar, null);
                                }
                                success = true;