Question

I am able to use HtmlAgilityPack in a Console Application, but when trying in a WPF app I always get this error on this line document.DocumentNode.Descendants() :

Could not find an implementation of the query pattern for source type 'System.Collections.Generic.IEnumerable<HtmlAgilityPack.HtmlNode>'.  'Where' not found.  Are you missing a reference to 'System.Core.dll' or a using directive for 'System.Linq'?

This is the code :

public partial class Window1 : Window
    {
        public Window1()
        {
            var webget = new HtmlWeb();

            var document = webget.Load("http://google.com");

            var p = from program in document.DocumentNode.Descendants()
                    where program.Name == "a"
                    select program.InnerText;

            InitializeComponent();
        }
    }

Anyone has an idee why I get that error ?

Thanks.

Answer 1

Add:

using System.Linq;

to your existing using statements near the top of the file.