c# htmlagilitypack parse first link from div with class?

问题

I am trying to parse the first link in the html code below /search?id=3

<div class="brs_col">
  <p>
    <a href="/search?id=3">
      <b>
        vastu shastra
      </b>
    </a>
  </p>
  <p>
    <a href="/search?id=1">
      <b>
        bygga
      </b>
      bastu
    </a>
  </p>
</div>

I've tried to select it with the following XPATH, but cant seem to get any of them to work:

//div[@class='brs_col']//p//a[@href]
//div[@class='brs_col']//p[0]//a[@href]
//div[@class='brs_col']//p//a[0][@href]

Any ideas?

回答1:

Try this:

var doc = new HtmlDocument();
doc.LoadHtml(@"<div class=""brs_col"">
                  <p><a href=""/search?id=3""><b>vastu shastra</b></a></p>
                  <p><a href=""/search?id=1""><b>bygga</b>bastu</a></p>
                </div>");
var hrefValue = doc.DocumentNode
                   .SelectSingleNode("//div[@class='brs_col']/p/a")
                   .Attributes["href"]
                   .Value;

回答2:

You can try this

doc.DocumentNode.SelectNodes("//a[@href]").FirstOrDefault();

回答3:

This if you sure that is the first url in the whole HTML document:

doc.DocumentNode.SelectSingleNode("//a").Attributes["href"].Value;

Or this if you sure that is the first ulr in the class brs_col

doc.DocumentNode.SelectSingleNode("//div[@class='brs_col']//a").Attributes["href"].Value;

来源：https://stackoverflow.com/questions/16662938/c-sharp-htmlagilitypack-parse-first-link-from-div-with-class