C# HTMLParser 2个使用范例

            System.Net.WebClient aWebClient = new System.Net.WebClient();
            WebClient.Encoding = System.Text.Encoding.Default;
            string html = aWebClient.DownloadString("http://www.baidu.com");

            Lexer lexer = new Lexer(html);
            Parser parser = new Parser(lexer);
            NodeFilter nodeFilter = new TagNameFilter("title");
          

            NodeList htmlNodes = parser.Parse(nodeFilter);

            Console.WriteLine(htmlNodes.Count+"==========================");
            for (int i = 0; i < htmlNodes.Count;i++ )
            {
                Console.WriteLine(htmlNodes.ElementAt(i).GetText());
            }

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
using Winista.Text.HtmlParser; 
using Winista.Text.HtmlParser.Lex;
using Winista.Text.HtmlParser.Util;
using Winista.Text.HtmlParser.Tags; 
using Winista.Text.HtmlParser.Filters; 
namespace HTMLParser 
{ 
    public partial class Form1 : Form 
      { 
        public Form1() 
          { 
              InitializeComponent(); 
              AddUrl(); 
          } 
        private void btnParser_Click(object sender, EventArgs e) 
          {
              #region 获得网页的html
            try
              { 
                  txtHtmlWhole.Text = ""; 
                string url = CBUrl.SelectedItem.ToString().Trim(); 
                  System.Net.WebClient aWebClient = new System.Net.WebClient(); 
                  aWebClient.Encoding = System.Text.Encoding.Default; 
                string html = aWebClient.DownloadString(url); 
                  txtHtmlWhole.Text = html; 
              } 
            catch (Exception ex) 
              { 
                  MessageBox.Show(ex.Message); 
              }
              #endregion
              #region 分析网页html节点
              Lexer lexer = new Lexer(this.txtHtmlWhole.Text); 
              Parser parser = new Parser(lexer); 
              NodeList htmlNodes = parser.Parse(null); 
            this.treeView1.Nodes.Clear(); 
            this.treeView1.Nodes.Add("root"); 
              TreeNode treeRoot = this.treeView1.Nodes[0]; 
            for (int i = 0; i <    htmlNodes.Count; i++) 
              { 
                this.RecursionHtmlNode(treeRoot, htmlNodes[i], false); 
              }
              #endregion
          } 
        private void RecursionHtmlNode(TreeNode treeNode, INode htmlNode, bool siblingRequired) 
          { 
            if (htmlNode == null || treeNode == null) return; 
              TreeNode current = treeNode; 
              TreeNode content ; 
            //current node
            if (htmlNode is ITag) 
              { 
                  ITag tag = (htmlNode as ITag); 
                if (!tag.IsEndTag()) 
                  { 
                    string nodeString = tag.TagName; 
                    if (tag.Attributes != null && tag.Attributes.Count > 0) 
                      { 
                        if (tag.Attributes["ID"] != null) 
                          { 
                              nodeString = nodeString + " { id=\"" + tag.Attributes["ID"].ToString() + "\" }"; 
                          } 
                        if (tag.Attributes["HREF"] != null) 
                          { 
                              nodeString = nodeString + " { href=\"" + tag.Attributes["HREF"].ToString() + "\" }"; 
                          } 
                      } 
                       
                      current = new TreeNode(nodeString); 
                      treeNode.Nodes.Add(current); 
                  } 
              } 
            //获取节点间的内容
            if (htmlNode.Children != null && htmlNode.Children.Count > 0) 
              { 
                this.RecursionHtmlNode(current, htmlNode.FirstChild, true); 
                  content = new TreeNode(htmlNode.FirstChild.GetText()); 
                  treeNode.Nodes.Add(content); 
              } 
            //the sibling nodes
            if (siblingRequired) 
              { 
                  INode sibling = htmlNode.NextSibling; 
                while (sibling != null) 
                  { 
                    this.RecursionHtmlNode(treeNode, sibling, false); 
                      sibling = sibling.NextSibling; 
                  } 
              } 
          } 
        private void AddUrl() 
          { 
              CBUrl.Items.Add("http://www.hao123.com"); 
              CBUrl.Items.Add("http://www.sina.com"); 
              CBUrl.Items.Add("http://www.heuet.edu.cn"); 
          } 
           
      } 
}