Win7/8下通过C#获取IPv4的方法

            IPHostEntry IpEntry = Dns.GetHostEntry(Dns.GetHostName());
            string myip;
            foreach (IPAddress ip in IpEntry.AddressList)
            {
                if (ip.AddressFamily == AddressFamily.InterNetwork)
                {
                    myip = ip.ToString();
                    break;
                }
            }        

其中的myip即为ip地址的字符串形式。