IUserType is the way to go.
On Tue, Oct 7, 2008 at 12:02 AM, Jason Meckley <[EMAIL PROTECTED]>wrote:
>
> I would like to use null objects for optional behavior in my
> entities. currently I have this
> class Child
> {
> private IParent parent = null;
> public IParent { get {return parent;} set{parent = value;} }
> }
>
> interface IParent { //readonly members }
>
> public class Parent : IParent
> {
> //poco members
> }
>
> where parent is optional for child. Both child and parent have
> associated mapping files.
>
> I would like to also have a NullParent object which inherits IParent.
> This way I'm not always checking for null values.
>
> class NullParent : IParent
> {
> protected NullParent() {}
> public static readonly IParent Instance = new NullParent();
> //readonly members
> }
>
> class Child
> {
> private IParent parent = NullParent.Instance;
> public IParent { get; set; }
> }
>
> but NH throws a PropertyAccessException. Object does not match target
> type. is there a way to use NullObjects with NH, or do I need to
> provide a service to do this?
> >
>
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