public void RemoveItemCriterion(IItemCriterion criterion)
{
if (_itemCriteria.Contains(criterion))
{
_itemCriteria.Remove(criterion);
}
}
public void AddItemCriterion(IItemCriterion criterion)
{
if (!criterion.MultipleCriteriaAllowed && _itemCriteria.Any(c => c.GetType() == criterion.GetType()))
{
throw new InvalidOperationException("The criterion only allows to be applied once");
}
_itemCriteria.Add(criterion);
}
