C#获取当前站点的根地址

         /// <summary>
         /// 得到当前网站的根地址
         /// </summary>
         /// <returns></returns>
         protected string GetRootPath()
         {
             // 是否为SSL认证站点
             string secure = HttpContext.Current.Request.ServerVariables["HTTPS"];
             string httpProtocol = (secure == "on" ? "https://" : "http://");
             // 服务器名称
             string serverName = HttpContext.Current.Request.ServerVariables["Server_Name"];
             string port = HttpContext.Current.Request.ServerVariables["SERVER_PORT"];
             // 应用服务名称
             string applicationName = HttpContext.Current.Request.ApplicationPath;
             return httpProtocol + serverName + (port.Length >  ? ":" + port : string.Empty) + applicationName;
         }