public static async Task <List <FeedViewModel> > GetFeedsAsync()
{
var feeds = (await SQLiteService.QueryAllFeeds()).Select(feedinfo => new FeedViewModel(feedinfo)).ToList();
foreach (var feedviewmodel in feeds)
{
await feedviewmodel.LoadArticlesFromDb();
// 如果需要加载就刷新一次，就在这里加多一个函数
}
return(feeds);
}