/// <summary>方法一：比较推荐
/// 用HttpWebRequest取得网页源码

        /// 对于带BOM的网页很有效，不管是什么编码都能正确识别

        /// </summary>

        /// <param name="url">网页地址" </param>

        /// <returns>返回网页源文件</returns>

        public static string GetHtmlSource2(string url,Encoding code)

        {

            //处理内容

            string html = "";

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

            request.Accept = "*/*"; //接受任意文件

            request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322)"; // 模拟使用IE在浏览

            request.AllowAutoRedirect = true;//是否允许302

            //request.CookieContainer = new CookieContainer();//cookie容器，

            request.Referer = url; //当前页面的引用

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            Stream stream = response.GetResponseStream();

            StreamReader reader = new StreamReader(stream, code);

            html = reader.ReadToEnd();

            stream.Close();

            return html;

        }

        //方法二：

        public static string GetHttpData2(string Url)

        {

            string sException = null;

            string sRslt = null;

            WebResponse oWebRps = null;

            WebRequest oWebRqst = WebRequest.Create(Url);

            oWebRqst.Timeout = ;

            try

            {

                oWebRps = oWebRqst.GetResponse();

            }

            catch (WebException e)

            {

                sException = e.Message.ToString();

            }

            catch (Exception e)

            {

                sException = e.ToString();

            }

            finally

            {

                if (oWebRps != null)

                {

                    StreamReader oStreamRd = new StreamReader(oWebRps.GetResponseStream(), Encoding.GetEncoding("utf-8"));

                    sRslt = oStreamRd.ReadToEnd();

                    oStreamRd.Close();

                    oWebRps.Close();

                }

            }

            return sRslt;

        }

        /// <summary>方法三：
///

        /// </summary>

        /// <param name="url">/要访问的网站地址</param>

        /// <param name="charSets">目标网页的编码，如果传入的是null或者"",那就自动分析网页的编码</param>

        /// <returns></returns>

        public static string getHtml(string url, params  string[] charSets)

        {

            try

            {

                string charSet = null;

                if (charSets.Length == )

                {

                    charSet = charSets[];

                }

                WebClient myWebClient = new WebClient(); //创建WebClient实例myWebClient

                // 需要注意的：

                //有的网页可能下不下来，有种种原因比如需要cookie,编码问题等等

                //这是就要具体问题具体分析比如在头部加入cookie

                // webclient.Headers.Add("Cookie", cookie);

                //这样可能需要一些重载方法.根据需要写就可以了

                //获取或设置用于对向 Internet 资源的请求进行身份验证的网络凭据.

                myWebClient.Credentials = CredentialCache.DefaultCredentials;

                //如果服务器要验证用户名，密码

                //NetworkCredential mycred = new NetworkCredential(struser, strpassword);

                //myWebClient.Credentials = mycred;

                //从资源下载数据并返回字节数组.(加@是因为网址中间有"/"符号)

                byte[] myDataBuffer = myWebClient.DownloadData(url);

                string strWebData = Encoding.Default.GetString(myDataBuffer);

                //获取网页字符编码描述信息

                Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)", RegexOptions.IgnoreCase | RegexOptions.Multiline);

                string webCharSet = charSetMatch.Groups[].Value;

                if (charSet == null || charSet == "")

                    charSet = webCharSet;

                if (charSet != null && charSet != "" && Encoding.GetEncoding(charSet) != Encoding.Default)

                {

                    strWebData = Encoding.GetEncoding(charSet).GetString(myDataBuffer);

                }

                else

                {

                    strWebData = Encoding.GetEncoding("utf-8").GetString(myDataBuffer);

                }

                return strWebData;

            }

            catch (Exception e) { return ""; }

        }

/// <summary>

    /// 远程获取数据

    /// </summary>

    /// <param name="url">url</param>

    /// <param name="code">编码</param>

    /// <param name="ProxyStr">代理IP，格式：10.20.30.40:8888</param>

    /// <returns></returns>

    public static string SendUrl(string url, Encoding code, string ProxyStr)

    {

        string html = string.Empty;

        //try

        //{

            HttpWebRequest WebReques = (HttpWebRequest)HttpWebRequest.Create(url);

            WebReques.Method = "GET";

            WebReques.Timeout = ;

            if (ProxyStr.Length > )

            {

                WebProxy proxy = new WebProxy(ProxyStr, true);

                WebReques.Proxy = proxy;

            }

            HttpWebResponse WebRespon = (HttpWebResponse)WebReques.GetResponse();

            if (WebRespon != null)

            {

                StreamReader sr = new StreamReader(WebRespon.GetResponseStream(), code);

                html = sr.ReadToEnd();

                sr.Close();

                sr.Dispose();

                WebRespon.Close();

            }

        //}

        //catch

        //{

        //}

        return html;

    }

 public string SendUrlGZIP(string PageUrl, System.Text.Encoding encode, string ProxyStr)

    {

        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(PageUrl);

        if (ProxyStr.Length > )

        {

            WebProxy proxy = new WebProxy(ProxyStr, true);

            request.Proxy = proxy;

        }

        request.Headers.Add("Accept-Encoding", "gzip,deflate");

        request.AutomaticDecompression = DecompressionMethods.GZip;

        //request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;

        WebResponse response = request.GetResponse();

        Stream resStream = response.GetResponseStream();

        Encoding enc = encode;

        StreamReader sr = new StreamReader(resStream, enc);

        string strHtml = sr.ReadToEnd();

        resStream.Close();

        sr.Close();

        return strHtml;

    }