static DanceViewModel()
{
foreach (var dance in Dances.All)
{
AllDances[dance] = new DanceViewModel(dance);
}
}
public static DanceViewModel GetOrAdd(Dance dance)
{
if (!AllDances.ContainsKey(dance))
{
AllDances[dance] = new DanceViewModel(dance);
}
return(AllDances[dance]);
}
public static IEnumerable <DanceViewModel> ToViewModel(this IEnumerable <Dance> dances)
{
return(dances.Select <Dance, DanceViewModel>((d) => DanceViewModel.GetOrAdd(d)));
}