private async void LoadMoreClick(object sender, RoutedEventArgs e)
        {
            (Application.Current as App).currentPage++;
            string url       = "https://api.tuchong.com/feed-app?post_id=" + (Application.Current as App).lastPostId + "&page=" + (Application.Current as App).currentPage.ToString() + "&type=loadmore";
            var    MineItems = await TuchongHelper.GetTuchongImage(url);

            await AddtoGridView(MineItems);
        }
        private async Task GetFirstData()
        {
            string url = "https://api.tuchong.com/feed-app";

            _mine = await TuchongHelper.GetTuchongImage(url);

            (Application.Current as App).lastPostId = _mine[_mine.Count - 1].post_id;
        }
        public async Task <IEnumerable <TuchongImageMine> > GetPagedItemsAsync(int pageIndex, int pageSize, CancellationToken cancellationToken = default(CancellationToken))
        {
            IEnumerable <TuchongImageMine> result = null;

            (Application.Current as App).currentPage++;
            ObservableCollection <TuchongImageMine> MineItems = new ObservableCollection <TuchongImageMine>();

            string url = "";

            if ((Application.Current as App).bRefresh)
            {
                url = "https://api.tuchong.com/feed-app";
            }
            else
            {
                url = "https://api.tuchong.com/feed-app?post_id=" + (Application.Current as App).lastPostId + "&page=" + (Application.Current as App).currentPage.ToString() + "&type=loadmore";
            }

            MineItems = await TuchongHelper.GetTuchongImage(url);

            foreach (var item in MineItems)
            {
                if ((Application.Current as App).toShowItems.Contains(item))
                {
                    continue;
                }
                (Application.Current as App).toShowItems.Add(item);
                _mine.Add(item);
                await Task.Delay(50);
            }
            (Application.Current as App).lastPostId = MineItems[MineItems.Count - 1].post_id;
            (Application.Current as App).bRefresh   = false;

            result = (Application.Current as App).toShowItems.AsEnumerable <TuchongImageMine>();
            return(result);
        }
        private async Task GetRecommend()
        {
            var MineItems = await TuchongHelper.GetTuchongImage("https://api.tuchong.com/feed-app");

            await AddtoGridView(MineItems);
        }