c# 获取web客户端ip

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 #region 获取web客户端ip

        /// <summary>
        /// 获取IP地址
        /// </summary>
        /// <returns></returns>
        public static string getIPAddress()
        {
            string ipv4 = String.Empty;
            foreach (IPAddress ip in Dns.GetHostAddresses(GetClientIP()))
            {
                if (ip.AddressFamily.ToString() == "InterNetwork")
                {
                    ipv4 = ip.ToString();
                    break;
                }
            }
            if (ipv4 != String.Empty)
            {
                return ipv4;
            }
            // 利用 Dns.GetHostEntry 方法，由获取的 IPv6 位址反查 DNS 纪录，
            // 再逐一判断何者为 IPv4 协议，即可转为 IPv4 位址。
            foreach (IPAddress ip in Dns.GetHostEntry(GetClientIP()).AddressList)
            //foreach (IPAddress ip in Dns.GetHostAddresses(Dns.GetHostName()))
            {
                if (ip.AddressFamily.ToString() == "InterNetwork")
                {
                    ipv4 = ip.ToString();
                    break;
                }
            }
            return ipv4;
        }

 private static string GetClientIP()
        {
            if (null == HttpContext.Current.Request.ServerVariables["HTTP_VIA"])
            {
                return HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
            }
            else
            {
                return HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
            }
        } 

    #endregion

c# 获取web客户端ip

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原文地址：http://www.cnblogs.com/lk516924/p/5567168.html