題
我正在使用HTML Agility Pack並在class="fileHeader"中搜索div其中包含子h4元素中的"RelayClinical Patient Education with Animations Install zip" 。一旦找到，我想捕獲該特定塊的錨標記內的"href"屬性。我怎麼才能得到它？
HTML來源
<div class="fileHeader" id="fileHeader_7311111">
<h4 class="collapsed">RelayClinical Patient Education with Animations Install zip</h4>
<div class="defaultMethod">
<a class="buttonGrey" href="https://mckc-esd.subscribenet.com/cgi-bin/download?rid=2511740931&rp=DTM20130905162949MzcyODIwNjM0" title="Clicking this link will open a new window." rel="noreferrer">
HTTPS Download
</a>
</div>
</div>
碼
<div class="fileHeader" id="fileHeader_7311111">
<h4 class="collapsed">RelayClinical Patient Education with Animations Install zip</h4>
<div class="defaultMethod">
<a class="buttonGrey" href="https://mckc-esd.subscribenet.com/cgi-bin/download?rid=2511740931&rp=DTM20130905162949MzcyODIwNjM0" title="Clicking this link will open a new window." rel="noreferrer">
HTTPS Download
</a>
</div>
</div>
一般承認的答案
而不是選擇h4元素，直接選擇a元素。然後你可以獲取href屬性。
var h4Text = "RelayClinical Patient Education with Animations Install zip";
var xpath = String.Format(
"//div[@class='fileHeader' and h4='{0}']/div[@class='defaultMethod']/a",
h4Text
);
var anchor = doc.DocumentNode.SelectSingleNode(xpath);
if (anchor != null)
{
var attr = anchor.GetAttributeValue("href", null);
// do stuff with attr
}