HttpWebRequest Get 数据 显示乱码 类似正长方形


  private string GetPost(string Url)
        {

            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(Url);
            req.Method = "GET";
            req.Accept = "application/x-shockwave-flash, image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/QVOD, application/QVOD, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*";
            req.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; QQDownload 691; CIBA; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET4.0C; .NET4.0E; InfoPath.2)";
            WebHeaderCollection head = new WebHeaderCollection();

            req.Headers = head;
            req.KeepAlive = true;
            req.Timeout = 30000;

            HttpWebResponse res = (HttpWebResponse)req.GetResponse();
            Stream stm = res.GetResponseStream();
            StreamReader sr = new StreamReader(stm, Encoding.GetEncoding("utf-8"));//
            string endstr = sr.ReadToEnd();
            string sk = sr.ReadLine();
            string skk = sr.ToString();

            res.Close();
            stm.Close();
            sr.Close();
            return endstr;