vb.net使用htmlagilitypack获取所有属性值

Snoopy Ohoo 发表于 Dev

史努比·奥胡（Snoopy Ohoo）

这是HTML

<div id="catlist-listview" class="cat-listview cat-listbsize">  
 <ul>
  <li><a href="http://wantedlink1" rel="bookmark" title="sometitel1" class="sonra">title1</a></li>    
  <li><a href="http://wantedlink2" rel="bookmark" title="sometitel2" class="sonra">title2</a></li>
  <li><a href="http://wantedlink3" rel="bookmark" title="sometitel3" class="sonra">title3</a></li>
  <li><a href="http://wantedlink4" rel="bookmark" title="sometitel4" class="sonra">title4</a></li>
  <li><a href="http://wantedlink5" rel="bookmark" title="sometitel5" class="sonra">title5</a></li>
  <li><a href="http://wantedlink6" rel="bookmark" title="sometitel6" class="sonra">title6</a></li>
  <li><a href="http://wantedlink7" rel="bookmark" title="sometitel7" class="sonra">title7</a></li>
  <li><a href="http://wantedlink8" rel="bookmark" title="sometitel8" class="sonra">title8</a></li>
  <li><a href="http://wantedlink9" rel="bookmark" title="sometitel9" class="sonra">title9</a></li>
  <li><a href="http://wantedlink10 " rel="bookmark" title="sometitel10" class="sonra">title10</a></li>
 </ul>
</div>

我的代码是

dim htmldoc as new htmldocument
htmldoc.loadhtml(source)
for each link as htmlnode in htmldoc.document.selectnodes("//*[@id='catlist-listview']/ul")
textbox3.text = link.innerhtml
next

输出是

      <li><a href="http://wantedlink1" rel="bookmark" title="sometitel1" class="sonra">title1</a></li>    
      <li><a href="http://wantedlink2" rel="bookmark" title="sometitel2" class="sonra">title2</a></li>
      <li><a href="http://wantedlink3" rel="bookmark" title="sometitel3" class="sonra">title3</a></li>
      <li><a href="http://wantedlink4" rel="bookmark" title="sometitel4" class="sonra">title4</a></li>
      <li><a href="http://wantedlink5" rel="bookmark" title="sometitel5" class="sonra">title5</a></li>
      <li><a href="http://wantedlink6" rel="bookmark" title="sometitel6" class="sonra">title6</a></li>
      <li><a href="http://wantedlink7" rel="bookmark" title="sometitel7" class="sonra">title7</a></li>
      <li><a href="http://wantedlink8" rel="bookmark" title="sometitel8" class="sonra">title8</a></li>
      <li><a href="http://wantedlink9" rel="bookmark" title="sometitel9" class="sonra">title9</a></li>
      <li><a href="http://wantedlink10 " rel="bookmark" title="sometitel10" class="sonra">title10</a></li>

我想要得到的所有，只http://wantedlink1给http://wantedlink10我尝试属性（“HREF”），但我得到的只有一个链接我要列出这样的所有链接：

http://wantedlink1 
http://wantedlink2 
http://wantedlink3 
.
. 
. 
http://wantedlink10

任何帮助？

har07

基本上，您可以将XPath更改为SelectNodes()选择单个<a>元素而不是<ul>。然后从这一点开始，很容易遍历结果并href逐个获取属性。或者，您可以使用LINQ达到相同的目的，例如以下示例：

'select <a> elements'
Dim links = htmldoc.Document.SelectNodes("//*[@id='catlist-listview']/ul/li/a")
'project to IEnumerable of href attribute value'
Dim hrefs = links.Cast(Of HtmlNode)().Select(Function(x) x.GetAttributeValue("href", ""))
'join the `hrefs`, separated by newline, into one string'
textbox3.text = String.Join(Environment.NewLine, hrefs)

dotnetfiddle demo

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