C#获取百度新歌TOP50

影者东升

先上软件效果图

代码如下
1.根据Url地址得到网页的html源码

1  public static string GetWebContent(string Url)
 2     {
 3       string strResult = "";
 4       try
 5       {
 6         HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
 7         //声明一个HttpWebRequest请求
 8         request.Timeout = 30000;
 9         //设置连接超时时间
10         request.Headers.Set("Pragma", "no-cache");
11         HttpWebResponse response = (HttpWebResponse)request.GetResponse();
12         Stream streamReceive = response.GetResponseStream();
13         Encoding encoding = Encoding.GetEncoding("GB2312");
14         StreamReader streamReader = new StreamReader(streamReceive, Encoding.UTF8);
15         strResult = streamReader.ReadToEnd();
16       }
17       catch
18       {
19         MessageBox.Show("出错");
20       }
21       return strResult;
22     }

2.根据元素判断是否使用了指定名字的样式，此方法有不妥之处，请大师指点
之所以重写是因为li.GetAttribute("class")获取不到例如,<a class=style1>这种没有引号的格式，所以就自己写了一个，检索不是很规范，

bool ContaintClass(HtmlElement li, string ClassName)
    {
      string Html = li.OuterHtml;
      string str = Html.Substring(1, Html.IndexOf('>')-1);
      if (str.Contains(ClassName))
        return true;
      else
        return false;
    }

3.使用

private void btn_GetList_Click(object sender, EventArgs e)
    {
      DataTable dt = new DataTable();
      dt.Columns.Add("OrderID");
      dt.Columns.Add("MusicName");
      dt.Columns.Add("Singer");
      string DataURL = (string)txt_DataURL.SelectedValue;
      if (String.IsNullOrEmpty(DataURL))
      {
        MessageBox.Show("数据来源不能为空！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);
      }
      string StrWebContent = GetHTMLContent.GetWebContent(DataURL);
      int ListStart = StrWebContent.IndexOf("<div class="top-list-item">");
      int ULStart = StrWebContent.IndexOf("<ul", ListStart);
      int ULEnd = StrWebContent.IndexOf("</ul>", ULStart);
      string strweb = StrWebContent.Substring(ULStart, ULEnd);

      //生成HtmlDocument 
      WebBrowser webb = new WebBrowser();
      webb.Navigate("about:blank");
      HtmlDocument htmldoc = webb.Document.OpenNew(true);
      htmldoc.Write(strweb);
      HtmlElementCollection htmlli = htmldoc.GetElementsByTagName("li");
      string ClassName_OrderID = "index-num";
      string ClassName_SontTitle = "song-title";
      string ClassName_Singer = "singer";
      string[] ClassNames = new string[] { ClassName_OrderID, ClassName_SontTitle, ClassName_Singer };
      foreach (HtmlElement li in htmlli)
      {

        HtmlElementCollection htmlSpan = li.GetElementsByTagName("span");
        string[] musicInfo = new string[3];
        int i = 0;
        int InfoIndex = 0;
        while (i >= 0 && i < htmlSpan.Count)
        {
          if (ContaintClass(htmlSpan[i], ClassNames[InfoIndex]))
          {
            musicInfo[InfoIndex] = htmlSpan[i].InnerText;
            InfoIndex++;
            if (InfoIndex > 2) break;
          }
          i++;
        }
        DataRow dr = dt.NewRow();
        dr["OrderID"] = musicInfo[0];
        dr["MusicName"] = musicInfo[1];
        dr["Singer"] = musicInfo[2];
        dt.Rows.Add(dr);
      }
      dataGridView1.DataSource = dt;
    }

代码都很简单
慎于行,敏于思！GGGGGG