Question

I need to load a property on an object that is set for lazy load. When I try to access it or load it using NhibernateUtil.Initialize(), I get the same error:

“Initializing[ProjectName.Logic.Entities.AddressList#9]-Could not initialize proxy – no Session.”

I can ensure that the session DOES exist by calling the necessary method to open a session in the “using” clause. (We have buried our session creation such that instantiating a repository object with a parameter of “true” will also create a session factory if needed and open a session. Verified with a breakpoint triggered at the “using” clause.)

foreach (MemberViewModel MVM in _filteredMemberViewModels)
           {
               foreach (Detail Mailings in MVM.Member.Mailings)  
               {
                   //used for lazy loading
                   using (var repo = new AddressListRepository(true))
                   {
                       NHibernateUtil.Initialize(Mailings.AddressList);
                   }
               }
           }

Detail Mapping:

public class DetailMap : ClassMap<Detail>
{
    public DetailMap()
    {
        Table("AddressDetailsCCN");

        // Unique Identifier
        Id(x => x.Id, "Id")
            .GeneratedBy.Identity();

        // MANY TO ONE relationship (the list has many details)
        References<AddressList>(x => x.AddressList, "ListId")
            .LazyLoad()
            .Not.Nullable()
            .Cascade.None();

        // MANY TO ONE relationship (Members have details)
        References<Member>(x => x.Member, "MemberId")
            .Not.LazyLoad()
            .Not.Nullable();

        // First line of Address
        Map(x => x.Address, "Address")
            .Nullable();

        // Second line of Address
        Map(x => x.Address2, "Address2")
            .Nullable();

        // City
        Map(x => x.City, "City")
            .Nullable();

        // State
        Map(x => x.State, "State")
            .Nullable();

        // Zip
        Map(x => x.Zip, "Zip")
            .Nullable();

        // Finalized date
        Map(x => x.FinalizedDate, "FinalizedDate")
            .CustomType(typeof(DateTime))
            .Nullable();

        // Date the list is created by
        Map(x => x.CreatedDate, "CreatedDate")
            .CustomType(typeof(DateTime))
            .Not.Nullable();
    }
}

Answer 1

You need to attach your Mailings object to the session before you can initialize any properties on it. You would have to expose a method on your repository to do so, which would call:

session.Lock(entity, LockMode.None);

That will then associate the entity (Mailings) with your session and then the call to NHibernateUtil.Initialize(Mailings.AddressList) should work.

However I would suggest re-considering why you need to do it this way and look at having coarser grained sessions (ie. open it earlier and close it later).