private void button1_Click(object sender, EventArgs e)

         {

             if (!string.IsNullOrEmpty(txtCsdnUrl.Text.Trim()))

             {

                 string url = txtCsdnUrl.Text.Trim();

                 string htmlSource = string.Empty;

                 htmlSource = GetHtmlSource(url);

                 int pageCount = GetPageCount(htmlSource);

                 string context = string.Empty;

                 if (pageCount > )

                 {

                     for (int i = ; i <= pageCount; i++)

                     {

                         htmlSource = GetHtmlSource(url + "?page=" + i);

                        context+= GetLZArticle(htmlSource);

                     }

                 }

                 else

                 {

                     context += GetLZArticle(htmlSource);

                 }

                 richTextBox1.Text = context;

             }

             else

             {

                 MessageBox.Show("请输入地址");

             }

         }

         /// <summary>

         /// 获取源代码

         /// </summary>

         /// <param name="Url"></param>

         /// <returns></returns>

         public string GetHtmlSource(string Url)

         {

             WebClient client = new WebClient();

             client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");

             Stream data = client.OpenRead(Url);

             string result = string.Empty;

             using (StreamReader reader = new StreamReader(data, Encoding.UTF8))

             {

                 result = reader.ReadToEnd();

             }

             return result;

         }

         /// <summary>

         /// 获取贴子总页数 URL格式:http://bbs.csdn.net/topics/390730011?page=2

         /// </summary>

         /// <returns>返回最大页数</returns>

         public int GetPageCount(string HtmlSource)

         {

             int pageCount = ;

             Regex reg = new Regex("<select class=\"jumpMenu\" name=\"jumpMenu\">(?<val>.*?)</select>", RegexOptions.Singleline | RegexOptions.IgnoreCase);

             string htmlSource = HtmlSource;

             Regex reg1 = new Regex("<option.*?>(?<val>.*?)</option>", RegexOptions.Singleline | RegexOptions.IgnoreCase);

             int count = reg1.Matches(reg.Match(htmlSource).Groups["val"].Value).Count;

             int.TryParse(reg1.Matches(reg.Match(htmlSource).Groups["val"].Value)[count - ].Groups["val"].Value,

                          out pageCount);

             return pageCount;

         }

         /// <summary>

         /// 获取文章标题

         /// </summary>

         /// <param name="HtmlSource">网页内容</param>

         /// <returns></returns>

         public string GetArticleTitle(string HtmlSource)

         {

             string title = string.Empty;

             Regex reg = new Regex("<span class=\"title text_overflow\">(?<title>.*?)</span>", RegexOptions.Singleline | RegexOptions.IgnoreCase);

             title = reg.Match(HtmlSource).Groups["title"].Value;

             return title;

         }

         public string GetAuthorName(string HtmlSource)

         {

             string result = string.Empty;

             Regex regex = new Regex("<a class=\"p-author\" href=\"#\">(?<value>.*?)</a>");

             result = regex.Match(HtmlSource).Groups["value"].Value;

             return result;

         }

         public string GetLZArticle(string HtmlSource)

         {

             string result = string.Empty;

             string authorName = GetAuthorName(HtmlSource);

             Regex regex = new Regex("<td valign=\"top\" class=\"post_info .*?\" data-username=\"" + authorName + "\".*?>.*?<div class=\"post_body\">(?<value>.*?)</div>.*?</td>", RegexOptions.Singleline | RegexOptions.IgnoreCase);

             for (int i = ; i < regex.Matches(HtmlSource).Count; i++)

             {

                 result += regex.Matches(HtmlSource)[i].Groups["value"].Value;

                 result += "--------------------分隔线--------------------";

             }

             return result.Trim().Replace("<br />","\r\n");

         }