/// <summary>
/// Initializes the new instance.
/// </summary>
/// <param name="originSet">Origin set to iterate</param>
/// <param name="wherePredicate">Predicate used for filtering</param>
public ObervableCollectionSubset(IObservableCollection <TElement> originSet, Predicate <TElement> wherePredicate)
{
_originSet = originSet ?? throw new ArgumentNullException(nameof(originSet));
_wherePredicate = wherePredicate ?? throw new ArgumentNullException(nameof(wherePredicate));
// If the collection has been changed, we need to clear the cache
_originSet.AddListener(new CollectionListenerAdapter <TElement>(OnOriginSetChanged));
}