private void AddTracks(List<ITrack> tracks, ReadOnlyObservableCollection<object> group)
{
if (group.Any())
if (group[0] is ITrack)
tracks.AddRange(group.Cast<ITrack>());
else
foreach (CollectionViewGroup item in group)
AddTracks(tracks, item.Items);
}
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
ReadOnlyObservableCollection <object> list = (ReadOnlyObservableCollection <object>)value;
return(list.Cast <StudentMsg>().Sum(p => p.Point));
}
