NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();            
foreach (NetworkInterface adapter in nics)
{  //判断是否为以太网卡                
    //Wireless80211 无线网卡    
    //Ppp  宽带连接                
    //Ethernet   以太网卡 
    if (adapter.NetworkInterfaceType == NetworkInterfaceType.Ethernet)
   {                    
       //获取以太网卡网络接口信息
      IPInterfaceProperties ip = adapter.GetIPProperties();                    
      //获取单播地址集
      UnicastIPAddressInformationCollection ipCollection = ip.UnicastAddresses;
      foreach (UnicastIPAddressInformation ipadd in ipCollection)
     {                        
         //InterNetwork  IPV4地址      
         //InterNetworkV6  IPV6地址                        
         //Max  MAX 位址
        if (ipadd.Address.AddressFamily == AddressFamily.InterNetwork) //判断是否为ipv4
        label1.Text = ipadd.Address.ToString();//获取ip                    
     }
   }
 }