ASP.NET 获取IP地址的几种方法

 /// <summary>
        /// 获取用户登陆IP
        /// </summary>
        /// <returns>返回用户IP</returns>
        public 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;
        }

        /// <summary>
        /// 获取用户登陆IP
        /// </summary>
        /// <returns>返回用户IP</returns>
        public string GetIp2()
        {
            return System.Web.HttpContext.Current.Request.ServerVariables.GetValues("REMOTE_ADDR")[0];
        }

        /// <summary>
        /// 获取用户登陆IP
        /// </summary>
        /// <returns>返回用户IP</returns>
        public string GetIp3()
        {
            return System.Web.HttpContext.Current.Request.UserHostAddress;
        }