请求页面因为不同页面不同编辑格式照成的乱码

/// <summary>
        /// 网址流
        /// </summary>
        /// <param name="Url"></param>
        /// <returns></returns>
        public static Stream GetWebUrlStream(string Url)
        {
            Stream stream = null;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            {
                stream = response.GetResponseStream();
            }
            return stream;
        }

public ActionResult GetBaiduUrlInfo()
        {
            string url = RequestUtils.GetString("url");
            Stream stream = HttpWebRequestUntil.GetWebUrlStream(url);
            string strHtml = "";
            List<byte> lst = new List<byte>();
            int nRead = 0;
            while ((nRead = stream.ReadByte()) != -1) lst.Add((byte)nRead);
            byte[] byHtml = lst.ToArray();
            //utf8的编码比较多 所以默认先用他解码  
            strHtml = Encoding.UTF8.GetString(byHtml, 0, byHtml.Length);
            //就算编码没对也不会影响英文和数字的显示 然后匹配真正编码  
            string strCharSet =
                Regex.Match(strHtml, @"<meta.*?charset=""?([a-z0-9-]+)\b", RegexOptions.IgnoreCase)
                .Groups[1].Value;
            //如果匹配到了标签并且不是utf8 那么重新解码一次  
            if (strCharSet != "" && (strCharSet.ToLower().IndexOf("utf") == -1))
            {
                try
                {
                    strHtml = Encoding.GetEncoding(strCharSet).GetString(byHtml, 0, byHtml.Length);
                }
                catch
                {
                }
            }
            return Json(new { html = strHtml }, JsonRequestBehavior.AllowGet);
        }