What is the best practice for readonly lists in NHibernate

Question

Domain Model I am working on has root aggregate and child entities. Something like the following code:

class Order
{
   IList Lines {get;se         


        

Answer 1

The pattern I use is:

class Order
{
   private List lines = new List();

   IEnumerable Lines { get { return this.lines; } }

   void AddLine(OrderLine line)
   {
       this.orders.Add(line);
   }
}

If you're using NET 3.5 you get all the search functionality you could want for IEnumerable using LINQ, and you hide your collection implementation.

The problem with returning OrderLine[] is that your collection can be modified externally eg:

Order.Lines[0] = new OrderLine().