I have an two files, both are embedded, in Visual Studio .Net.

They are hibernate.hbm.xml and Part.hbm.xml

In the file hibernate.hbm.xml I can use <mapping assembly="myassembly"/> and the configuration works fine.

However, if I change it to <mapping resource="Part.hbm.xml"/> it fails with the following message:

Object reference not set to an instance of an object.

Any ideas why this may be, I'm fairly sure it is to do with the <mapping> tag because changing this causes the error.

IIRC, when using "resource", you must also set the "assembly" so that NHibernate knows where to extract the resource.

Anyway, it should throw a meaningful exception...

I added the assembly

<mapping resource="Part.hbm.xml" assembly="myassembly"/>

Now I get the following error:


Additional information: Resource: Part.hbm.xml not found


But the file Part.hbm.xml is an embedded resource.

Any ideas now?

Open your assembly with ILDAsm to see the "Full Qualified Name" of your resource; most of the time, it is:

Worked a treat, thank you very much :D :D