ToSic.SexyContent.ContentGroup.GetPresentationIdWithSameLengthAsContent C# (CSharp) Method

        private List<int?> GetPresentationIdWithSameLengthAsContent()
        {
            var difference = Content.Count - Presentation.Count;

            if (difference < 0)
                throw new Exception("There are more Presentation elements than Content elements.");

            var entityIds = ListWithNulls(cPresentation); // Presentation.Select(p => p?.EntityId).ToList();

            // extend as necessary
            if (difference != 0)
                entityIds.AddRange(Enumerable.Repeat(new int?(), difference));

            return entityIds; // SaveChangedLists(PrepareSavePackage(cPresentation, entityIds));
        }