Question

How can i parse the rel=”canonical” tag with URL from a html document?

I want to find the url here:

<link rel="canonical" href="http://stackoverflow.com/questions/2593147/html-agility-pack-make-code-look-neat" />

Answer 1

Suppose doc is your HtmlDocument object.

HtmlNodeCollection links = doc.DocumentNode.SelectNodes("//link[@rel]");

should get you the link elements that have a rel attribute. Now iterate:

foreach (HtmlNode link in links)
{
    string url;
    if (link.Attributes["rel"] == "canonical") {
        url = link.Attributes["href"];
    }
}

Also, it’s possible to filter links in the SelectNodes call to only get the ones with “canonical”: doc.DocumentNode.SelectNodes("//link[@rel='canonical']");

Not tested code, but you get the idea 🙂