public void PopulateAssignedCategoryData(NeaguDenisa_ProiectContext context, Document book) { var allCategories = context.Category; var bookCategories = new HashSet <int>( book.DocumentCategories.Select(c => c.DocumentID)); AssignedCategoryDataList = new List <AssignedCategoryData>(); foreach (var cat in allCategories) { AssignedCategoryDataList.Add(new AssignedCategoryData { CategoryID = cat.ID, Name = cat.CategoryName, Assigned = bookCategories.Contains(cat.ID) }); } }
public void UpdateBookCategories(NeaguDenisa_ProiectContext context, string[] selectedCategories, Document bookToUpdate) { if (selectedCategories == null) { bookToUpdate.DocumentCategories = new List <DocumentCategory>(); return; } var selectedCategoriesHS = new HashSet <string>(selectedCategories); var bookCategories = new HashSet <int> (bookToUpdate.DocumentCategories.Select(c => c.Category.ID)); foreach (var cat in context.Category) { if (selectedCategoriesHS.Contains(cat.ID.ToString())) { if (!bookCategories.Contains(cat.ID)) { bookToUpdate.DocumentCategories.Add( new DocumentCategory { DocumentID = bookToUpdate.ID, CategoryID = cat.ID }); } } else { if (bookCategories.Contains(cat.ID)) { DocumentCategory courseToRemove = bookToUpdate .DocumentCategories .SingleOrDefault(i => i.CategoryID == cat.ID); context.Remove(courseToRemove); } } } }