private async Task <IEnumerable <IModel> > GetData(uint startIndex, int page) { if (IsLoading) { return(new List <IModel>()); } if (currentPage > 5) { Pins.NoMore(); NoMoreVisibility = Visibility.Visible; return(new List <IModel>()); } IsLoading = true; try { var home = await HomeService.GetPagingHomeAsync(currentPage ++); if (home.Recommends.Count > 0) { Pins.HasMore(); } else { Pins.NoMore(); NoMoreVisibility = Visibility.Visible; } if (home.Explores?.Count > 0 && !(Explores?.Count > 0)) { Explores = new ObservableCollection <Explore>(home.Explores); } return(home.Recommends); } catch { } finally { IsLoading = false; } return(null); }