/// <summary>
/// Try to get the old articles in the database
/// 这是一个可扩展的方法。
/// </summary>
private static async Task LoadArticlesFromDb(this FeedViewModel feedViewModel)
{
if (feedViewModel.Id != null)
{
feedViewModel.Articles.Clear();
// working here
feedViewModel.IsLoading = true;
(await SQLiteService.QueryAritclesByFeedIdAsync((int)feedViewModel.Id)).Select(item => new ArticleModel(item))
.ToList().ForEach(article =>
{
article.InitialOnlyBindingProperty(feedViewModel);
feedViewModel.Articles.Insert(0, article);
// 在这里在开始的时候添加Favourite的文章
if (article.IsStarred)
{
MainPage.Current.ViewModel.StarredFeed.Articles.Insert(0, article);
}
});
feedViewModel.IsLoading = false;
}
return;
}