C#获取百度新歌TOP50
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
1public 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;
int i = 0;
int InfoIndex = 0;
while (i >= 0 && i < htmlSpan.Count)
{
if (ContaintClass(htmlSpan, ClassNames))
{
musicInfo = htmlSpan.InnerText;
InfoIndex++;
if (InfoIndex > 2) break;
}
i++;
}
DataRow dr = dt.NewRow();
dr["OrderID"] = musicInfo;
dr["MusicName"] = musicInfo;
dr["Singer"] = musicInfo;
dt.Rows.Add(dr);
}
dataGridView1.DataSource = dt;
}代码都很简单
慎于行,敏于思！GGGGGG
文档来源：51CTO技术博客https://blog.51cto.com/u_1539555/3197430
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