C# 获取客户端ip地址

    /// <summary>
        /// 获取当前用户客户端ip
        /// </summary>
        /// <returns></returns>
        private string GetCurrentUserIp()
        {
            string userIP;
            userIP = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_VIA"] == null ? System.Web.HttpContext.Current.Request.UserHostAddress : System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

            return userIP;
        }