得到服务器网址

 /// <summary>
        /// 得到服务器网址
        /// </summary>
        /// <returns></returns>
        public string getUrl()
        {
            string url = "http://" + Request.ServerVariables["HTTP_HOST"].ToString() + Request.ServerVariables["PATH_INFO"].ToString();  //获得URL的值
            int i = 0;
            i=url.LastIndexOf("/");
            url = url.Substring(0, i);
                   return url;
        }