private object[] GetFilteredItems(bool useModelFilter, NameValueCollection collection, FakeItem[] items)
 {
     IQueryable<FakeItem> filteredItems;
     if (useModelFilter)
     {
         var modelFilter = GetModelFilter(collection);
         filteredItems = modelFilter.Filter(items);
         return modelFilter.Project(filteredItems).ToArray();
     }
     return items.Filter(collection).Project(collection).ToArray();
 }