public void RimuoviEditor(int idEditor)
        {
            var found = ElencoNews.Where(x => x.publisherId == idEditor).ToList();

            foreach (var item in found)
            {
                ElencoNews.Remove(item);
            }
        }
        public async void AggiungiEditor(int idEditor)
        {
            if (ElencoNews.Any())
            {
                var envelop = await postApp.GetEditorNewsFromTo(idEditor, ElencoNews.First().id, ElencoNews.Last().id);

                if (envelop.response == StatusCodes.OK)
                {
                    AggiungiNewsAFeed(envelop.content);
                }
            }
            LoadMoreVisibility = true;
        }
        private void AggiungiNewsAFeed(List <News> el_news)
        {
            int startFromIndex = 0;

            foreach (var item in el_news)
            {
                for (int i = startFromIndex; i < ElencoNews.Count; i++)
                {
                    if (item.id > ElencoNews[i].id)
                    {
                        ElencoNews.Insert(i, item);
                        startFromIndex = i + 1;
                    }
                }
            }
        }