HtmlAgilityPack搭配 ScrapySharp或HtmlAgilityPack.CssSelectors

Html Agility Pack 源码中的类大概有28个左右，其实不算一个很复杂的类库，但它的功能确不弱，为解析DOM已经提供了足够强大的功能支持，可以跟jQuery操作DOM媲 美：）Html Agility Pack最常用的基础类其实不多，对解析DOM来说，就只有HtmlDocument和HtmlNode这两个常用的类，还有一个 HtmlNodeCollection集合类。

一、ScapySharp

HTML Agility Pack的操作起来还是很麻烦，下面我们要介绍的这个组件是ScrapySharp，他在2个方面针对Html Agility Pack进行了包装，使得解析Html页面不再痛苦，幸福指数直线上升到90分哈。

ScapySharp有了一个真实的浏览器包装类（处理Reference，Cookie等），另外一个就是使用类似于jQuery一样的Css选择器和Linq语法。让我们使用起来非常的爽。它的代码放在 https://bitbucket.org/rflechner/scrapysharp。也可以通过Nuget添加

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using HtmlAgilityPack;
using ScrapySharp.Extensions;
using ScrapySharp.Network;

namespace HTMLAgilityDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            var uri = new Uri("http://www.cnblogs.com/shanyou/archive/2012/05/20/2509435.html");
            var browser1 = new ScrapingBrowser();
            var html1 = browser1.DownloadString(uri);
            var htmlDocument = new HtmlDocument();
            htmlDocument.LoadHtml(html1);
            var html = htmlDocument.DocumentNode;

            var title = html.CssSelect("title");
            foreach (var htmlNode in title)
            {
                Console.WriteLine(htmlNode.InnerHtml);
            }
            var divs = html.CssSelect("div.postBody");

            foreach (var htmlNode in divs)
            {
                Console.WriteLine(htmlNode.InnerHtml);
            }

            divs = html.CssSelect("#cnblogs_post_body");
            foreach (var htmlNode in divs)
            {
                Console.WriteLine(htmlNode.InnerHtml);
            }
        }
    }
}

Basic examples of CssSelect usages:

var divs = html.CssSelect("div");  //all div elements

var nodes = html.CssSelect("div.content"); //all div elements with css class ‘content’

var nodes = html.CssSelect("div.widget.monthlist"); //all div elements with the both css class

var nodes = html.CssSelect("#postPaging"); //all HTML elements with the id postPaging

var nodes = html.CssSelect("div#postPaging.testClass"); // all HTML elements with the id postPaging and css class testClass 

var nodes = html.CssSelect("div.content > p.para"); //p elements who are direct children of div elements with css class ‘content’ 

var nodes = html.CssSelect("input[type=text].login"); // textbox with css class login 

We can also select ancestors of elements:

var nodes = html.CssSelect("p.para").CssSelectAncestors("div.content > div.widget");

二、搭配HtmlAgilityPack.CssSelectors(这个有bug，class里面有下划线_会抛异常)

var postItems = htmlDocument.QuerySelectorAll(".post-item");

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" alt="" />

参考：http://www.cnblogs.com/shanyou/archive/2012/05/27/2520603.html

http://www.tools138.com/create/article/20141014/130844875.html