How to find out the key field for a nhibernate object

Question

Say I have the following query

ICriteria query = session.CreateCriteria(typeof(T));

How can I find out the key field of T so that I can add an expression like so

query.Add(Expression.In(keyField, someListOfObjects.ToArray()));

Any ideas?

Answer 1

Use NH's meta data

var meta = factory.GetClassMetadata(typeof(T));

query.Add(Expression.In(meta.IdentifierPropertyName, someListOfObjects.ToArray()));