Has anyone moved to NHibernate 2.0 in a production environment?

Question

If so, have you run into any immediate gotchas?

Answer 1

Yes..

Here are the gotchas (a more detailed discussion here):

Flush after Delete
Expression namespace change to Criterion

It wasn't a tough migration, and it won't be for you if you have good test coverage.

Answer 2

We have moved to 2.0, but only for new development (not migrating old to new).

The reason for this was there are a couple of breaking changes that are documented online and we didn't have the budget to fix it. The big ones for use were:

• Changed NHibernate.Expression namespace to NHibernate.Criterion
• <nhibernate> section is ignored, using <hibernate-configuration> section (note that they have different XML formats)

Edit: There's a pretty good summary of the latest changes to NHibernate 2.0 on CodeBetter