C#爬虫（04）：HtmlAgilityPack解析html文档

doc.DocumentNode.SelectSingleNode("//title").InnerText;//XPath中：“//title”表示所有title节点。SelectSingleNode用于获取满足条件的唯一的节点。

doc.DocumentNode.Descendants("a")

var kwBox = doc.DocumentNode.SelectSingleNode("//input[@name=‘kw‘]");

private void Form1_Load(object sender, EventArgs e)
{
    List<Result> list = new List<Result>();
    HtmlWeb htmlWeb = new HtmlWeb();
    htmlWeb.OverrideEncoding = Encoding.UTF8;//编码，这里网上有些很多写法都不正确
    HtmlAgilityPack.HtmlDocument htmlDoc = htmlWeb.Load(@http://www.cnblogs.com/);
    //选择博客园首页文章列表
    htmlDoc.DocumentNode.SelectNodes("//div[@id=‘post_list‘]/div[@class=‘post_item‘]").//双斜杠“//”表示从跟节点开始查找
        AsParallel().ToList().ForEach(ac =>
        {
            //抓取图片，因为有空的，所以拿变量存起来
            HtmlNode node = ac.SelectSingleNode(".//p[@class=‘post_item_summary‘]/a/img");
            list.Add(new Result
            {
                url = ac.SelectSingleNode(".//a[@class=‘titlelnk‘]").Attributes["href"].Value,
                title = ac.SelectSingleNode(".//a[@class=‘titlelnk‘]").InnerText,
                //图片如果为空，显示默认图片
                img = node == null ? "http ://www.cnblogs.com//Content/img/avatar.png" : node.Attributes["src"].Value,
                content = ac.SelectSingleNode(".//p[@class=‘post_item_summary‘]").InnerText
            });
        });

    foreach (Result item in list)
    {
        this.listBox1.Items.Add(item.title);
    }
}

/// <summary>
/// 页面抓取结果
/// </summary>
public class Result
{
    /// <summary>
    /// 链接
    /// </summary>
    public string url { get; set; }
    /// <summary>
    /// 标题
    /// </summary>
    public string title { get; set; }
    /// <summary>
    /// 头像地址
    /// </summary>
    public string img { get; set; }
    /// <summary>
    /// 正文内容
    /// </summary>
    public string content { get; set; }
}

using HtmlAgilityPack;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace ConsoleApp4
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            //网页地址：
            string Url = "https://docs.microsoft.com/zh-cn/aspnet/mvc/overview/getting-started/getting-started-with-ef-using-mvc/implementing-inheritance-with-the-entity-framework-in-an-asp-net-mvc-application";

            List<string> list = new List<string>(); ;
            HtmlWeb htmlWeb = new HtmlWeb();
            htmlWeb.OverrideEncoding = Encoding.UTF8;

            HtmlDocument htmlDoc = htmlWeb.Load(Url);

            HtmlNode node = htmlDoc.DocumentNode.SelectSingleNode("//main[@id=‘main‘]");

            //去掉英文翻译
            var a = node.SelectNodes("//span[@class=‘sxs-lookup‘]");
            foreach (HtmlNode b in a)

            {
                b.Remove();
            }

            string src = "";
            //图片相对路径改成绝对路径
            var imgNode = node.SelectNodes("//img[@data-linktype=‘relative-path‘]");
            foreach (HtmlNode node1 in imgNode)
            {
                src = node1.GetAttributeValue("src", "");
                var url = new Uri(htmlWeb.ResponseUri, src);
                node1.SetAttributeValue("src", url.AbsoluteUri);
            }

            //链接路径转换
            var hrefNode = node.SelectNodes("//a[@data-linktype=‘relative-path‘]|//a[@data-linktype=‘absolute-path‘]");
            foreach (HtmlNode node1 in hrefNode)
            {
                src = node1.GetAttributeValue("href", "");
                var url = new Uri(htmlWeb.ResponseUri, src);
                node1.SetAttributeValue("href", url.AbsoluteUri);
            }

            //找到所有的H2标签，然后加上顺序。
            var h2Node = node.SelectNodes("//h2");
            var arr = new string[] { "一", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二", "十三", "十四", "十五", "十六", "十七", "十八", "十九", "二十" };
            if (h2Node != null)
            {
                for (int i = 0; i < h2Node.Count; i++)
                {
                    h2Node[i].InnerHtml = arr[i] + "、" + h2Node[i].InnerHtml;
                    //找到所有的H3标签，然后加上顺序。

                    var h3Node = h2Node[i].SelectNodes("following-sibling::h2|following-sibling::h3");
                    if (h3Node is null)
                        break;
                    for (int j = 0; j < h3Node.Count; j++)
                    {
                        if (h3Node[j].Name == "h2")
                            break;
                        else
                            h3Node[j].InnerHtml = (j + 1) + "、" + h3Node[j].InnerHtml;
                    }
                }
            }
            HtmlNode myNOde = htmlDoc.CreateElement("div");

            //去掉前面无用的部分
            var OK = node.SelectNodes("nav[1]/following-sibling::*");
            myNOde.AppendChildren(OK);

            //添加原文连接：
            HtmlNode nodeOriUrl = htmlDoc.CreateElement("p");
            nodeOriUrl.InnerHtml = "原文：<a href=‘" + htmlWeb.ResponseUri + "‘>" + htmlWeb.ResponseUri + "</a>";
            myNOde.PrependChild(nodeOriUrl);

            //写入到本地文件
            TextWriter wr = new StreamWriter(@"aa.html");
            myNOde.WriteTo(wr);
            wr.Close();
        }
    }
}

// Load the document using HTMLAgilityPack as normal
var html = new HtmlDocument();
html.LoadHtml(@"
  <html>
      <head></head>
      <body>
        <div>
          <p class=‘content‘>Fizzler</p>
          <p>CSS Selector Engine</p></div>
      </body>
  </html>");

// Fizzler for HtmlAgilityPack is implemented as the
// QuerySelectorAll extension method on HtmlNode

var document = html.DocumentNode;

// yields: [<p class="content">Fizzler</p>]
document.QuerySelectorAll(".content");

// yields: [<p class="content">Fizzler</p>,<p>CSS Selector Engine</p>]
document.QuerySelectorAll("p");

// yields empty sequence
document.QuerySelectorAll("body>p");

// yields [<p class="content">Fizzler</p>,<p>CSS Selector Engine</p>]
document.QuerySelectorAll("body p");

// yields [<p class="content">Fizzler</p>]
document.QuerySelectorAll("p:first-child");