public GroupSorter(TGroup group, GroupSorterSelector <TGroup, TItem> groupSorterSelector, IEnumerable <TItem> collection)
{
Group = group;
_groupSorterSelector = groupSorterSelector;
_itemsSorter = (collection == null)
? new Sorter <TItem>()
: new Sorter <TItem>(collection.Where(x => _groupSorterSelector(group, x)));
}
public GroupSorter(TGroup group, GroupSorterSelector <TGroup, TItem> groupSorterSelector) : this(group, groupSorterSelector, null)
{
}
