NHibernate 3.0 and LINQ: what am I missing?

Question

I recently decided to upgrade my web application from NHibernate 2.1 to 3.0, the latest version of NH. I also decided to upgrade from .NET 2.0 to 3.5 for best compatibility with Mono (the webapp runs only in Linux) now that it's mature enough.

I wanted to play a bit with LINQ and NHibernate, since I also saw that the NHibernate.Linq namespace is included in the release.

However, when I try to write a LINQ using the ISession instance, I don't get the Linq<T> method.

I read i many old blog posts that in order to use LINQ to NH you must use the NHContrib package.

My question is

Do I still need to download NHContrib? Version 3.0 of NH is much more recent than NHContrib's LINQ to NH, and I saw the Linq namespace included in the release

Or,

is it due to the Visual Studio 2010 upgrade with 2.0->3.5 framework upgrade? I double-checked and target framework IS 3.5.

Unfortunately, I can't find comprehensive documentation on NH 3.0 except the full class documentation, which is more useful for NH developers than general-purpose development

Thank you.

Answer 1

Also be aware that the inbuilt LINQ provider doesn't supprort the .Equals method in Where clauses, you need to use == instead. For instance, where the following used to work with NHibernate.Linq in 2x:

(from e in myEntities where e.Name.Equals(nameLookup) select e)

You now need to do

(from e in myEntities where e.Name == nameLookup select e)

Answer 2

NHibernate 3.0 has it's own LINQ providerb built in, you can access it via .Query<T>

So you don't need Ayende's NHibernate.Linq provider anymore.

Also, the NHibernate 3.0 Cookbook may help you out.

https://www.packtpub.com/nhibernate-3-0-cookbook/book