截取指定网站Html编码

   方法一：

        string url_s = "http://www.baidu.com/ ";
        WebRequest request_o = WebRequest.Create(url_s);
        HttpWebResponse response_o = (HttpWebResponse)request_o.GetResponse();
        Stream html_o = response_o.GetResponseStream();
        StreamReader reader_o = new StreamReader(html_o, System.Text.Encoding.Default);
        string html_s = reader_o.ReadToEnd();
        reader_o.Close();
        html_o.Close();
        response_o.Close();
        Response.Write(Server.HtmlEncode( html_s));

    方法二：

              WebClient wc = new WebClient();
            wc.Credentials = CredentialCache.DefaultCredentials;
            Stream resStream = wc.OpenRead(web);
            StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);
            code = sr.ReadToEnd();
            resStream.Close();

              ------------------------------

              WebClient wc = new WebClient();
            wc.Credentials = CredentialCache.DefaultCredentials;
            wc.Headers.Set("User-Agent", "Microsoft Internet Explorer");//增加的代码伪装
            Stream resStream = wc.OpenRead(web);
            StreamReader sr = new StreamReader(resStream, System.Text.Encoding.Default);
            code = sr.ReadToEnd();
            resStream.Close();