Utils.cs

using HtmlAgilityPack;
using System.Linq;
using UrlNotes.Models;
using System;

namespace UrlNotes
{
    public class Utils
    {
        public static void Unfurl<T>(ref T item) where T:Item
        {

            try
            {
                string src = string.Empty;
                var doc = new HtmlDocument();
                try
                {
                    var h = new HtmlWeb();
                    doc = h.Load(item.Url);
                }
                catch
                {
                }

                var metaTags = doc.DocumentNode.SelectNodes("//meta");

                var title = (from x in metaTags
                        where (x.Attributes["property"] != null && x.Attributes["property"].Value == "og:title") 
                        select x).FirstOrDefault().Attributes["content"].Value;
                item.Name = title;

                var keywords = (from x in metaTags
                                 where (x.Attributes["name"] != null && x.Attributes["name"].Value == "keywords")
                                 select x);


                if (keywords.Count() > 0)
                {
                   var words = keywords.FirstOrDefault().Attributes["content"].Value.Split(',');
                   item.Keywords = words.Select(x => new Keyword() { name = x }).ToList();
                }


                if (item.GetType() == typeof(Video))
                {
                    var i = item as Video;
                    
                    var comments = (from x in metaTags
                                    where (x.Attributes["name"] != null && x.Attributes["name"].Value == "CommentCount")
                                    select x).FirstOrDefault().Attributes["content"].Value;
                    int count;
                    i.CommentCount = int.TryParse(comments, out count) ? count : 0;

                    var img = (from x in metaTags
                               where (x.Attributes["property"] != null && x.Attributes["property"].Value == "og:image")
                               select x).FirstOrDefault().Attributes["content"].Value;
                    i.Screencap = new Uri(img);
                }
                
            }

            catch(Exception ex)
            {
                throw ex;
            }
            
        }
    }

}