string hostName = System.Net.Dns.GetHostName();                   //hostName获取主机名称                   System.Net.IPHostEntry ipEntry = System.Net.Dns.GetHostEntry(hostName);//Dns.GetHostByName(hostName);                             //ip地址列表                   System.Net.IPAddress[] addr = ipEntry.AddressList;                   string add = addr[0].ToString();