/// <summary>
/// Refreshes the list of featured exercises asynchronously.
/// </summary>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
private static async Task <ReadOnlyObservableCollection <Grouping <Exercise> > > GetFeaturedExercisesAsync()
{
ExerciseFeaturedApi featuredEndpoint = new ExerciseFeaturedApi(App.OAuth2Account);
IEnumerable <Exercise> featuredExercises;
try
{
featuredExercises = await Task.Run(async() => await featuredEndpoint.CallEndpointAsExerciseModel());
// Remove dictionary searches (they are not meant to be displayed in the list).
featuredExercises = featuredExercises.Where(x => x.GetType() != typeof(DictionarySearchExercise));
// Group the exercises by their CEFR level.
LanguageLevelClassificationToLongDescriptionConverter longDescConverter = new LanguageLevelClassificationToLongDescriptionConverter();
LanguageLevelClassificationToHtmlParamConverter htmlParamConverter = new LanguageLevelClassificationToHtmlParamConverter();
IEnumerable <Grouping <Exercise> > featuredByGroup = from ex in featuredExercises group ex by ex.Level into exSameLevel select new Grouping <Exercise>((string)longDescConverter.Convert(exSameLevel.Key, typeof(string), null, CultureInfo.CurrentCulture), (string)htmlParamConverter.Convert(exSameLevel.Key, typeof(string), null, CultureInfo.CurrentCulture), exSameLevel.ToList());
return(new ReadOnlyObservableCollection <Grouping <Exercise> >(new ObservableCollection <Grouping <Exercise> >(featuredByGroup)));
}
catch (AggregateException ex)
{
ex.Handle(x =>
{
Tools.Logger.Log("FeaturedExercise", ex);
return(true);
});
}
return(new ReadOnlyObservableCollection <Grouping <Exercise> >(new ObservableCollection <Grouping <Exercise> >()));
}
/// <summary>
/// Refreshes the list of featured exercises asynchronously.
/// </summary>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
private static async Task <ReadOnlyObservableCollection <ExerciseGroup> > GetFeaturedExercisesAsync()
{
ExerciseFeaturedApi featuredEndpoint = new ExerciseFeaturedApi(App.OAuth2Account);
IList <Exercise> featuredExercises = await Task.Run(async() => await featuredEndpoint.CallEndpointAsExerciseModel());
// Group the exercises by their CEFR level.
LanguageLevelClassificationToLongDescriptionConverter longDescConverter = new LanguageLevelClassificationToLongDescriptionConverter();
LanguageLevelClassificationToHtmlParamConverter htmlParamConverter = new LanguageLevelClassificationToHtmlParamConverter();
IEnumerable <ExerciseGroup> featuredByGroup = from ex in featuredExercises group ex by ex.Level into exSameLevel select new ExerciseGroup((string)longDescConverter.Convert(exSameLevel.Key, typeof(string), null, CultureInfo.CurrentCulture), (string)htmlParamConverter.Convert(exSameLevel.Key, typeof(string), null, CultureInfo.CurrentCulture), exSameLevel.ToList());
return(new ReadOnlyObservableCollection <ExerciseGroup>(new ObservableCollection <ExerciseGroup>(featuredByGroup)));
}