在搜索引擎的开发中，我们需要对网页的Html内容进行检索，难免的就需要对Html进行解析。拆分每一个节点并且获取节点间的内容。此文介绍两种C#解析Html的方法。
第一种方法：
用System.Net.WebClient下载Web Page存到本地文件或者String中，用正则表达式来分析。这个方法可以用在Web Crawler等需要分析很多Web Page的应用中。
估计这也是大家最直接，最容易想到的一个方法。
转自网上的一个实例：所有的href都抽取出来：

using ...System;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
namespace HttpGet
...{
    class Class1
    ...{
        [STAThread]
        static void Main(string[] args)
        ...{
            System.Net.WebClient client = new WebClient();
            byte[] page = client.DownloadData("http://www.google.com");
            string content = System.Text.Encoding.UTF8.GetString(page);
            string regex = "href=[\\\"\\\'](http:\\/\\/|\\.\\/|\\/)?\\w+(\\.\\w+)*(\\/\\w+(\\.\\w+)?)*(\\/|\\?\\w*=\\w*(&\\w*=\\w*)*)?[\\\"\\\']";
            Regex re = new Regex(regex);
            MatchCollection matches = re.Matches(content);

            System.Collections.IEnumerator enu = matches.GetEnumerator();
            while (enu.MoveNext() && enu.Current != null)
            ...{
                Match match = (Match)(enu.Current);
                Console.Write(match.Value + "\r\n");
            }
        }
    }
}
 

 一些爬虫的HTML解析中也是用的类似的方法。
第二种方法：
利用Winista.Htmlparser.Net 解析Html。这是.NET平台下解析Html的开源代码，网上有源码下载，百度一下就能搜到，这里就不提供了。并且有英文的帮助文档。找不到的留下邮箱。
个人认为这是.net平台下解析html不错的解决方案，基本上能够满足我们对html的解析工作。
自己做了个实例：

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)
        ...{
            获得网页的html#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

            分析网页html节点#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");
        }运行效果：

        

    }
}

实现取来很容易，结合Winista.Htmlparser源码很快就可以实现想要的效果。