/// <summary>       /// 用HttpWebRequest取得網頁源碼      /// 對于帶BOM的網頁很有效，不管是什么編碼都能正確識別      /// </summary>      /// <param name="url">網頁地址" </param>      /// <returns>返回網頁源文件</returns>      public static string GetHtmlSource2(string url)    {      //處理內容        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)"; // 模擬使用IE在瀏覽 http://www.52mvc.com      request.AllowAutoRedirect = true;//是否允許302      //request.CookieContainer = new CookieContainer();//cookie容器，      request.Referer = url; //當前頁面的引用        HttpWebResponse response = (HttpWebResponse)request.GetResponse();      Stream stream = response.GetResponseStream();      StreamReader reader = new StreamReader(stream, Encoding.Default);      html = reader.ReadToEnd();      stream.Close();        return html;    }

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.IO;using System.Text;using System.Net;namespace MySql{  public class GetHttpData  {    public static string GetHttpData2(string Url)    {      string sException = null;      string sRslt = null;      WebResponse oWebRps = null;      WebRequest oWebRqst = WebRequest.Create(Url);      oWebRqst.Timeout = 50000;      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;    }   }}

public static string getHtml(string url, params string [] charSets)//url是要訪問的網站地址，charSet是目標網頁的編碼，如果傳入的是null或者""，那就自動分析網頁的編碼  {    try    {      string charSet = null;      if (charSets.Length == 1) {        charSet = charSets[0];      }      WebClient myWebClient = new WebClient(); //創建WebClient實例myWebClient      // 需要注意的：      //有的網頁可能下不下來，有種種原因比如需要cookie,編碼問題等等      //這是就要具體問題具體分析比如在頭部加入cookie      // webclient.Headers.Add("Cookie", cookie);      //這樣可能需要一些重載方法。根據需要寫就可以了        //獲取或設置用于對向 Internet 資源的請求進行身份驗證的網絡憑據。      myWebClient.Credentials = CredentialCache.DefaultCredentials;      //如果服務器要驗證用戶名,密碼      //NetworkCredential mycred = new NetworkCredential(struser, strpassword);      //myWebClient.Credentials = mycred;      //從資源下載數據并返回字節數組。（加@是因為網址中間有"/"符號）      byte[] myDataBuffer = myWebClient.DownloadData(url);      string strWebData = Encoding.Default.GetString(myDataBuffer);        //獲取網頁字符編碼描述信息      Match charSetMatch = Regex.Match(strWebData, "<meta([^<]*)charset=([^<]*)/"", RegexOptions.IgnoreCase | RegexOptions.Multiline);      string webCharSet = charSetMatch.Groups[2].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 ""; }  }

private string GetStringByUrl(string strUrl) {   WebRequest wrt = WebRequest.Create(strUrl);   WebResponse wrse = wrt.GetResponse();   Stream strM = wrse.GetResponseStream();   StreamReader SR = new StreamReader(strM,  Encoding.GetEncoding("gb2312"));   string strallstrm = SR.ReadToEnd();   return strallstrm; } 

private string SaveHTML()  {     string str = RenderPage("Default2.aspx");     Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8"); //解決中文亂碼     Response.AddHeader("Content-Disposition","attachment;filename=index.html"); //解決中文文件名亂碼       Response.AddHeader("Content-length",str.Length.ToString());     Response.Write(str);     Response.End(); ｝