public async Task <IDictionary <string, IList <BookItem> > > LoadAsync(bool forceRefresh = false, int maxVolumeCount = 9)
{
if (!IsLoading && (!IsLoaded || forceRefresh))
{
IsLoading = true;
try
{
var recommandBookGroups = await CachedClient.GetRecommandedBookLists(forceRefresh);
this.Clear();
foreach (var bookGroup in recommandBookGroups)
{
var group = new KeyGroup <string, BookCoverViewModel>
{
Key = bookGroup.Key
};
if (bookGroup.Value.Count <= maxVolumeCount)
{
group.AddRange(bookGroup.Value.Select(x => new BookCoverViewModel(x)));
}
else
{
group.AddRange(bookGroup.Value.Take(maxVolumeCount).Select(x => new BookCoverViewModel(x)));
}
this.Add(group);
}
IsLoading = false;
IsLoaded = true;
NotifyPropertyChanged("IsEmpty");
return(recommandBookGroups);
}
catch (Exception exception)
{
IsLoading = false;
IsLoaded = false;
Debug.WriteLine(exception.Message);
return(null);
}
}
return(null);
}
public async Task LoadRecommandDataAsync()
{
if (IsLoading || IsRecommandLoaded)
{
return;
}
LoadingText = "Loading recommand books";
IsLoading = true;
try
{
var recommandBookGroups = await CachedClient.GetRecommandedBookLists();
RecommandBookItems = new List <KeyGroup <string, BookCoverViewModel> >();
foreach (var bookGroup in recommandBookGroups)
{
var group = new KeyGroup <string, BookCoverViewModel>
{
Key = bookGroup.Key
};
if (bookGroup.Value.Count <= 12)
{
group.AddRange(bookGroup.Value.Select(x => new BookCoverViewModel(x)));
}
else
{
group.AddRange(bookGroup.Value.Take(12).Select(x => new BookCoverViewModel(x)));
}
RecommandBookItems.Add(group);
}
IsLoading = false;
IsRecommandLoaded = true;
}
catch (Exception exception)
{
MessageBox.Show(exception.Message, "Exception when retriving recommanded books", MessageBoxButton.OK);
IsLoading = false;
}
}