@ -30,12 +30,7 @@ namespace Microsoft.eShopOnContainers.Services.Ordering.Domain.AggregatesModel.O
// so OrderItems cannot be added from "outside the AggregateRoot" directly to the collection,
// but only through the method OrderAggrergateRoot.AddOrderItem() which includes behaviour.
private readonly List < OrderItem > _orderItems ;
public IReadOnlyCollection < OrderItem > OrderItems = > _orderItems ;
// Using List<>.AsReadOnly()
// This will create a read only wrapper around the private list so is protected against "external updates".
// It's much cheaper than .ToList() because it will not have to copy all items in a new collection. (Just one heap alloc for the wrapper instance)
//https://msdn.microsoft.com/en-us/library/e78dcd75(v=vs.110).aspx
private int? _paymentMethodId ;