protected override IQueryable <TItem> FilterItems(SimplePaginationProviderInput <TItem> input, IQueryable <TItem> items)
        {
            if (input.Where != null)
            {
                var wherePredicate = input
                                     .Where;

                items = items.Where(wherePredicate);
            }
            return(items);
        }
 protected override IQueryable <TItem> GetItems(SimplePaginationProviderInput <TItem> input)
 {
     return(input.Items.AsQueryable());
 }