Asp.net MVC中获取访客IP的方法

/// <summary>

       /// 获取IP

       /// </summary>

       /// <returns></returns>

       private string GetIP()

       {

           string ip = string.Empty;

           if (!string.IsNullOrEmpty(System.Web.HttpContext.Current.Request.ServerVariables["HTTP_VIA"]))

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

           if (string.IsNullOrEmpty(ip))

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

           return ip;

       }