1         public void AddOrderItem(OrderItem item)

 2         {

 3             item.MustNotNull("item");

 4

 5             this.State.BeforeChangeOrder();

 6

 7             item.OrderId = this.Id;

 8             this.OrderItemCollection.Add(item);

 9             this.Total += item.Subtotal;

10         }

11

12         public void RemoveOrderItem(Guid productId)

13         {

14             this.State.BeforeChangeOrder();

15

16             var item = this.OrderItemCollection.First(x => x.ProductId == productId);

17             this.OrderItemCollection.Remove(item);

18             this.Total -= item.Subtotal;

19         }

 1             modelBuilder

 2                 .Entity<OrderItem>()

 3                 .HasKey(x => new { x.Id, x.OrderId });

 4

 5             modelBuilder

 6                 .Entity<Order>()

 7                 .HasKey(x => x.Id);

 8             modelBuilder

 9                 .Entity<Order>()

10                 .Property(x => x.OptimisticKey).IsRowVersion().IsConcurrencyToken();

11             modelBuilder

12                 .Entity<Order>()

13                 .HasMany(x => x.OrderItemCollection).WithRequired().HasForeignKey(x => x.OrderId).WillCascadeOnDelete();