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Asked: 2026-05-27T15:44:30+00:00

I am using Fluent NHibernate to map out an existing database. For this reason

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I am using Fluent NHibernate to map out an existing database. For this reason – automapping isn’t an option for me.

How do I tell NHibernate not to map certain properties? Many of them are read-only, and the others do not need to be persisted for other reasons.

I am writing this in VB.Net.

I get the typical error message:
“The following types may not be used as proxies
… should be ‘public/protected virtual’ or ‘protected internal virtual'”

I have purposely not made my objects Overridable (equivalent to virtual in C#) because I do not want NHibernate to touch them.

How can I achieve this?

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1 Answer

  1. Editorial Team

    All properties and methods must be overridable in order for NHibernate to create dynamic proxies, including unmapped properties. This does not imply that NHibernate is mapping your read-only properties, it just requires them to be overridable so that it can generate a proxy of the class. This article explains the requirement.

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