如何在c#中使用htmlagilitypack访问子节点【基于'from'条款]

Question

我有一个 html ：

    <div class="article-listing">
        <div class="media-data">

                             <h4><a href="http://thenextweb.com/media/2012/01/05/24symbols-white-labels-its-platform-to-give-any-organization-its-own-spotify-for-books/">24symbols White-Labels its 'Spotify for Books'</a></h4>
                             <p class="article-meta"><a href="http://thenextweb.com/media/">TNW Media</a> &#8226; <a href="http://thenextweb.com/author/martin/" title="Posts by Martin Bryant" rel="author">Martin Bryant</a>  &#8226; <span class="date" title="1325781355">January 5, 2012</span></a></p>

                             <p>24symbols, the &#8216;Spotify for books&#8217; startup that launched last summer, has been busy developing its service that allows users instant access to a library of books for a fixed fee&#8230;.</p>
                         </div></div>

I am using this xpath code for extracting required information :

    var webGet = new HtmlWeb();
                var document = webGet.Load(page);

                var infos = from info in document.DocumentNode.SelectNodes("//div[@class='article-listing']//div[@class='media-data']")
                            from link in info.Descendants("a").Where(x => x.Attributes.Contains("href"))
                            from content in info.Descendants("p").Where(y => y.HasAttributes != true)
                            from author in info.Descendants("//p[@class='article-meta']//a[@rel='author']").Where(z => z.Attributes.Contains("href"))
                            from date in info.Descendants("//p[@class='article-meta']//span")
                            select new
                                {
                                   LinkURL = link.Attributes["href"].Value,
                                   Text = content.InnerText,
                                   Author = author.InnerText,
                                   Date = date.InnerText
                                };
    lvLinks.DataSource = infos;
                lvLinks.DataBind();   

我正在使用列表视图控件在 asp 页面中显示数据，如使用

; <%# Eval("LinkURL") %> - <%# Eval("文本") %> - <%# Eval("作者") %>

但它不起作用...它没有显示任何错误，也没有在页面上显示任何数据。

使用不同的“from”子句选择节点可能存在一些问题。

请推荐我 谢谢

Answer 1

我已经解决了这个问题......这是与节点的选择有关。需要使用 SelectNodes 而不是后代，我还需要修复 SelectNodes() 方法中传递的标签。
我们可以使用下面的代码，它会工作得很好。

 var infos = from info in document.DocumentNode.SelectNodes("//div[@class='article-listing']//div[@class='media-data']")
    from link in info.SelectNodes("h4//a").Where(x => x.Attributes.Contains("href"))
    from content in info.SelectNodes("p").Where(y => y.HasAttributes != true)
    from author in info.SelectNodes("p[@class='article-meta']//a[@rel='author']").Where(z => z.Attributes.Contains("href"))
    from date in info.SelectNodes("p[@class='article-meta']//span")

    select new
     {
       LinkURL = link.Attributes["href"].Value,
       Text = content.InnerText,
       Author = author.InnerText,
       Date = date.InnerText
     };

lvLinks.DataSource = 信息；
lvLinks.DataBind();

工作正常...现在没问题