I have a application that is DO 3.9 and want to start extending it using DO 4.

To do this I need a couple of shared object's , that exist in both DO 3.9 and 4.

My site obect is in 3.9 so I created it in 4 and update any changes on the 3.9 version to the 4 version.

Simple version of objects:

public abstract class Site : DataObject {

       public abstract String name(get; set;}
       public abstract long D4Id(get; set;} // set to d4 id when created.

        [ItemType(typeof(PostCode))]
    public abstract DataObjectCollection PostCodes {get;}

       public virtual void RemovePostCode(PostCode postcode) {
                PostCodes.Remove(postcode);
                Model.Config.Site.D4RemovePostCode(D4Id, postcode.D4Id);
        }

}

&

[HierarchyRoot]
public class Site : Entity {
        [Field, Key]
        public long Id { get; private set; }
        [Field]
        public string Name { get; set; }

        [Field]
        public EntitySet<PostCode> PostCodes { get; private set; }

        public static void D4RemovePostCode(long targetId, long pcId) {
            using (D4.domain.OpenSession()) {
                using (var transactionScope = Transaction.Open()) {
                    Site target = (Key.Create<Site>(Tuple.Create(targetId))).Resolve<Site>();
                    PostCode pc = (Key.Create<PostCode>(Tuple.Create(pcId))).Resolve<PostCode>();
                    target.PostCodes.Remove(pc); *****  Exception thrown.
                    transactionScope.Complete();
                }
            }
        }
}

I use OnPropertyChanged to replicate changes of the value fields to the V4 objects. and add/remove from entityset when there is an add/remove on the DataObjectCollection. All works ok except Remove on the entity set, a call toD4RemovePostCode from RemovePostCode this throws the following exception:

Message "Method not found: 'Void Xtensive.Storage.Internals.EntitySetItem2..ctor(Xtensive.Storage.EntityState, Boolean)'." Source "Xtensive.TypeHelper.GeneratedTypes" StackTrace " at NNet.Model.Config.EntitySetItems.n_c_Site-PostCodes-n_c_PostCode..ctor(EntityState , Boolean ) at NNet.Model.Config.EntitySetItems.n_c_Site-PostCodes-n_c_PostCode.~Xtensive.Core.Aspects.ProtectedConstructorAccessor(EntityState , Boolean ) at Xtensive.Storage.Internals.Activator.CreateEntity(Type type, EntityState state, Boolean notify)\r\n at Xtensive.Storage.EntityState.get_Entity() at Xtensive.Storage.Key.Resolve(Session session) at Xtensive.Storage.Key.Resolve()\r\n at Xtensive.Storage.EntitySetBase.Remove(Entity item, Boolean notify) at Xtensive.Storage.EntitySet1.Remove(TItem item) at NNet.Model.Config.Site.D4RemovePostCode(Int64 targetId, Int64 pcId) in D:\Project\NNet-Web\NNet\Config\Model\Site.cs:line 284 at NNet.Config.Site.RemovePostCode(PostCode postcode) in D:\Project\NNet-Web\NNet\Config\Site.cs:line 337" string

If I perform the same operations in just D4 then remove works fine.

Tony Steele NeighbourNet Ltd

This thread was imported from our support forum. The original discussion may contain more detailed answer. Original topic by Anonymous.