nature_net.user_controls.list_populator.get_all_users C# (CSharp) Метод

        public List<user_item> get_all_users()
        {
            try
            {
                naturenet_dataclassDataContext db = new naturenet_dataclassDataContext();
                var r = from u in db.Users
                        where u.id != 0
                        orderby u.name
                        select u;
                if (r == null)
                {
                    return new List<user_item>();
                }
                List<user_item> users = new List<user_item>();
                foreach (User u in r)
                {
                    var n1 = from m in db.Collection_Contribution_Mappings
                             where m.Collection.user_id == u.id
                             orderby m.Contribution.date descending
                             select m.Contribution.date;
                    //var n2 = from f in db.Feedbacks
                    //         where f.user_id == u.id
                    //         orderby f.date descending
                    //         select f.date;
                    List<DateTime> n2 = null;
                    int cnt = 0;
                    if (n1 != null)
                        cnt = n1.Count();
                    if (n2 != null)
                        cnt = cnt + n2.Count();
                    user_item i = new user_item();
                    ImageSource src = new BitmapImage(new Uri(configurations.GetAbsoluteAvatarPath() + u.avatar));
                    src.Freeze();
                    i.img = src;
                    i.user = u;
                    i.count = cnt;
                    i.has_date = false;
                    if (n1 != null)
                    {
                        if (n1.Count() > 0)
                        {
                            i.last_date = n1.First();
                            i.has_date = true;
                        }
                    }
                    if (n2 != null)
                    {
                        if (n2.Count() > 0)
                        {
                            if (i.has_date)
                            {
                                if (i.last_date.CompareTo(n2.First()) < 0)
                                    i.last_date = n2.First();
                            }
                            else
                            {
                                i.last_date = n2.First();
                                i.has_date = true;
                            }
                        }
                    }
                    users.Add(i);
                }
                return users;
            }
            catch (Exception ex)
            {
                log.WriteErrorLog(ex);
                return new List<user_item>();
            }
        }