How to get a distinct result with nHibernate and QueryOver API?

If you’re using the ICriteria API, you need:

.SetResultTransformer(new DistinctEntityRootTransformer())

If you’re using the QueryOver API, you need:

.TransformUsing(Transformers.DistinctRootEntity)

But beware, this all occurs on client side, so all the duplicate rows are still pulled from SQL database.