获取客户端IP地址 for ASP.NET

        /// <summary>

        /// 获取Ip地址

        /// </summary>

        /// <returns></returns>

        public static string GetIp()

        {

            string user_IP;

            if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_VIA"] != null)

            {

                user_IP = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();

            }

            else

            {

                user_IP = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();

            }

            return user_IP;

        }