nHibernate -> Dependency in the UI layer

We want to take advantage of nHibernate's "Unit of Work" functionality. To accomplish this in our C# WinForms app, we need to open a session from within the UI layer i.e when a form opens. Perform some work and then close the session when we close the form.

This form based approach seems very logical except for the fact that we now require a reference to nHibernate from our UI layer! Where should we be referencing nHibernate, I would have though开发者_运维问答t we can accomplish thish without having to reference it from within our UI layer?

You need a session manager class, which would be a wrapper for binding the nhibernate session. Something like this:

    public class SessionManager : ISessionManager
{
    private  readonly ISessionFactory _sessionFactory;

     SessionManager()
    {
        _sessionFactory = CreateSessionFactory();
    }

    public void OpenSession()
    {
        ISession session = _sessionFactory.OpenSession();

        session.BeginTransaction();

        CurrentSessionContext.Bind(session);
    }


    public void CloseSession()
    {
        ISession session = CurrentSessionContext.Unbind(_sessionFactory);


        if (session == null) return;


        try
        {
            session.Transaction.Commit();
        }

        catch (Exception)
        {
            session.Transaction.Rollback();
        }

        finally
        {
            session.Close();

            session.Dispose();
        }
    }
}

Just create the CreateSessionFactory method.