NHibernate: c# action on cascade deletion

Question

I've implemented one-to-many code mapping with cascade deletion. I have associated file with child entity. I want to delete file automatically on child cascade deletion. How can it be implemented?

Answer 1

I found out that NHibernate supports Listeners on Configuration level. It's not perfect, but better than nothing. Simplified example:

var deleteListener = new DeleteListener();
_configuration.SetListener(ListenerType.Delete, deleteListener);

class DeleteListener : DefaultDeleteEventListener {
    public override void OnDelete(DeleteEvent e, ISet<object> transientEntities) {
        MyEntity entity = e.Entity as MyEntity;
        if (entity != null) {
            // code for file deletion
        }
        base.OnDelete(e, transientEntities);
    }
}