读取JSON文件

   string menuStr = "";// " 消息内容";
            Encoding encode = System.Text.Encoding.GetEncoding("GB2312"); //编码,否则会出现json中文乱码
            using (StreamReader sr = new StreamReader(HttpContext.Server.MapPath("/Json/sendmessage.json"), encode))
            {
                menuStr = sr.ReadToEnd();
            }