private void UpdateTopStoriesArticles()
{
try
{
var newArticles = new List <Article>();
if (_dataService.TopStoriesArticles == null || _dataService.TopStoriesArticles.Count <= 0)
{
return;
}
if (_dataService.TopStoriesArticles.Count >= 10)
{
newArticles = new List <Article>(_dataService.TopStoriesArticles.GetRange(0, 10));
}
else
{
newArticles = new List <Article>(_dataService.TopStoriesArticles);
}
if (newArticles.Count <= 0)
{
return;
}
newArticles = newArticles.OrderBy(x => x.PublishDate).ToList();
if (TopStoriesArticles == null)
{
TopStoriesArticles = new ObservableCollection <Article>();
}
foreach (var article in newArticles)
{
if (TopStoriesArticles.FirstOrDefault(o => o.ArticleId == article.ArticleId) == null)
{
TopStoriesArticles.Insert(0, article);
}
}
}
catch (Exception exception)
{
if (Debugger.IsAttached)
{
Debug.WriteLine("MainViewModel:" + exception);
}
}
}
public void RefreshTopNews()
{
if (TopStoriesArticles == null)
{
TopStoriesArticles = new ObservableCollection <Article>();
}
var expectedCount = TopStoriesArticles.Count + BatchSize;
if (_dataService.TopStoriesArticles.Count > expectedCount)
{
var newArticles = _dataService.TopStoriesArticles.GetRange(TopStoriesArticles.Count, BatchSize);
foreach (var article in newArticles)
{
if (TopStoriesArticles.FirstOrDefault(o => o.ArticleId == article.ArticleId) == null)
{
TopStoriesArticles.Add(article);
}
}
}
_moreTopStoriesAvailable = expectedCount == TopStoriesArticles.Count;
}