Reflection or DynamicMethod?

Question

I have used NHibernbate in few projects and now learned about few more ORMs also. I understand that, NHibernate binds Class to Datalayer dynamically during runtime using the mapping file.

My Question is , how this late binding is done ? I mean, which Methodology is used, 'Reflection' or 'DynamicMethod' ?

In case, if it uses Reflection, Is there any ORM which uses DynamicMethod? and provides better performance ?

Answer 1

As of NHibernate 2.1, the proxy factory is pluggable. Here are some proxy providers supported:

• Castle.DynamicProxy
• LinFu
• Spring.NET

So proxying will be actually out of NHibernate's responsibility, and the answer to this question really depends on the selected proxy factory.

Answer 2

NHibernate uses Castle.DynamicProxy, which under the hood uses DynamicMethods.

Answer 3

Exactly how an ORM instantiates entities is not a good way to assess its overall performance.