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Asked: 2026-05-31T20:32:37+00:00

I have created an entity data model and generated a database from it. One

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I have created an entity data model and generated a database from it.

One of the entities is called Template.

Created partial classes to extend the functionality of Template works fine.

If I create a new class and try to derive from Template, I get a runtime exception upon instantiating:

Mapping and metadata information could not be found for EntityType 'Template001'.

How can I work around this? I definitely need to inherit from the EF classes.

EDIT

Does not seem possible. If that is the case, what would be the best way to implement the following requirement: The template entity stores information about templates that each have their own code to execute. That is why I was trying to derive from the entity in the first place.

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1 Answer

  1. Editorial Team

    Why do you need to inherit from entity class first of all? If you want to add some simple behavior, use partial class.

    Update: Based on comments, it appears that there is possibility that behavior will be extended over the time. In this case, I would recommend using composition/aggregation, not inheritance. Let the classes that need to be extended have an entity as a field. In Raheel’s scenario, it would be a class called TemplateLogic with field/property of type Template.

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