How to determine if an NHibernate entity was updated

I have an application that mass-updated a load of entities based on external data. Some of them will have not changed. NHibernate is clever enough to know wh开发者_如何学Pythonether the entity has changed and whether or not to send an update when I call DbContext.CommitChanges().

But I want to be able to output to screen/log when an entity has been updated.

How do I find out if an update has been executed? How do I hook into Nhibernate change tracking?

NHibernate has an event system you can hook up to. Here is a blog post that explains what you want to do:

NHibernate 2.0 Events and Listeners

Here is the part of the NHibernate tutorial that explains the event system:

Chapter 11. Interceptors and events

And another one:

Creating an Audit Log using NHibernate Events