using System;  using System.Management;  using System.Net;     public class Program      {          static void Main(string[] args)          {              try              {                  string ip = "";                  string mac = "";                  ManagementClass mc;                  string hostInfo = Dns.GetHostName();                  //IP地址                  //System.Net.IPAddress[] addressList = Dns.GetHostByName(Dns.GetHostName()).AddressList;这个过时                    System.Net.IPAddress[] addressList = Dns.GetHostEntry(Dns.GetHostName()).AddressList;                  for (int i = 0; i < addressList.Length; i++)                  {                      ip = addressList[i].ToString();                  }                  //mac地址                  mc = new ManagementClass("Win32_NetworkAdapterConfiguration");                  ManagementObjectCollection moc = mc.GetInstances();                  foreach (ManagementObject mo in moc)                  {                      if (mo["IPEnabled"].ToString() == "True")                      {                          mac = mo["MacAddress"].ToString();                      }                  }                  //输出                  string outPutStr = "IP:{0},\n MAC地址:{1}";                  outPutStr = string.Format(outPutStr, ip, mac);                  Console.WriteLine(outPutStr);              }              catch (Exception e)              { }              Console.ReadLine();          }      }

 第二种方式

/// 
        /// 获取Mac地址        /// 
        ///         ///         ///         ///         /// 
             [DllImport("Iphlpapi.dll")]        public static extern uint SendARP(uint DestIP, uint SrcIP, ref ulong pMacAddr, ref uint PhyAddrLen);        public static string GetMac()        {            string p_Id = GetInternalIP();            IPAddress _Address;            if (!IPAddress.TryParse(p_Id, out _Address)) return "";            uint DestIP = System.BitConverter.ToUInt32(_Address.GetAddressBytes(), 0);            ulong pMacAddr = 0;            uint PhyAddrLen = 6;            uint error_code = SendARP(DestIP, 0, ref pMacAddr, ref PhyAddrLen);            byte[] _Bytes1 = BitConverter.GetBytes(pMacAddr);            return BitConverter.ToString(_Bytes1, 0, 6);        }        //获取内网IP        protected static string GetInternalIP()        {            IPHostEntry host;            string localIP = "?";            host = Dns.GetHostEntry(Dns.GetHostName());            foreach (IPAddress ip in host.AddressList)            {                if (ip.AddressFamily.ToString() == "InterNetwork")                {                    localIP = ip.ToString();                    break;                }            }            return localIP;        }