Implementing GetByClassName for a .Net XmlDocument.

I am using an XmlDocument to parse and manipulate an XHTML string, converting some nodes to non-HTML nodes.

What is the best way to get a list of all nodes with a given class name? Can it be done with XPath?

From stackoverflow

• With a given class? If it is just the one class, then you should be able to do something like .SelectNodes("//*[@class='foo']"). If it isn't xhtml, then the HTML Agility Pack is worth looking at.

  At the client, jQuery would be a good option - and supports composite class names.

  If you have multiple class names on individual elements, and need to handle it at the server, I expect you might need to find the candidate classes first ("//*[@class!='']), and then loop over them doing a Split() and checking for the class-name in the results; i.e. pull it apart manually.

  In LINQ terms, something like:

          var qry = from XmlElement el in d.SelectNodes("//*[@class!='']")
                    let classes = el.GetAttribute("class").Split(new[] {' '},
                            StringSplitOptions.RemoveEmptyEntries)
                    where classes.Contains("foo")
                    select el;
  

  tpower : I take it then that XPath does not support regular expressions?

  Marc Gravell : Not natively. There are a range of string functions available to you in xpath - however, nothing that would be particularly convenient.

• Yes, it's easy with XPath:

  //*[@class='foo']
  

  tpower : Thanks, does this take into account that an element can have more than one class name?