ManagementBaseObject inPar = null;
ManagementBaseObject outPar = null;
ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
ManagementObjectCollection moc = mc.GetInstances();
foreach (ManagementObject mo in moc)
{
   if (!(bool)mo["IPEnabled"])
   continue;
   
   //设置ip地址和子网掩码
   inPar = mo.GetMethodParameters("EnableStatic");
   inPar["IPAddress"] = new string[] { "172.168.1.111" };
   inPar["SubnetMask"] = new string[] { "255.255.255.0" };
   outPar = mo.InvokeMethod("EnableStatic", inPar, null);
   
   //设置网关地址
   inPar = mo.GetMethodParameters("SetGateways");
   inPar["DefaultIPGateway"] = new string[] { "172.168.1.1" };
   outPar = mo.InvokeMethod("SetGateways", inPar, null);
   
   //设置DNS
   inPar = mo.GetMethodParameters("SetDNSServerSearchOrder");
   inPar["DNSServerSearchOrder"] = new string[] { "221.11.1.67" };
   outPar = mo.InvokeMethod("SetDNSServerSearchOrder", inPar, null);
   
}