private IEnumerable <CollectionChange <ContentType, ContentType> > getCollectionChanges(IEnumerable <ContentType> items)
{
items = items ?? Enumerable.Empty <ContentType>();
//var cachedCollection = new List<TItem>(Collection);
//var list = items.Take(5).ToList();
//items = list.ReturnInValue((x) => x.Shuffle()).Take(ThreadSafeRandom.Next(0, list.Count + 1));
var changes = ContentList.GetCollectionChanges(items, EqualityComparer)
#if DEBUG
.ToList()
#endif
;
return(changes);
}
