Can I use an Interface as a property with Entity Framework?

Question

I have the following class which is a model for a database table:

public class User : IUser
{
    internal int Id { get; set; }

    public string Name { get; set; }
    public string Email { get; set; }

    public ITest TestData { get; set; }
}

When I run Update-Database command, it throws an error:

The property User.TestData is of an interface type (ITest). If it is a navigation property manually configure the relationship for this property by casting it to a mapped entity type

How and where can I manually configure the relationship for this property if I do not want the actual property to be a class?

https://stackoverflow.com/questions/43161458/the-property-is-of-an-interface-type-iformfile-mvc-core/43161520 — Guy, Jan 14 '18 at 13:47
https://stackoverflow.com/questions/9805329/how-to-use-interface-properties-with-codefirst — Levanan Gan, Jan 14 '18 at 14:01

score 7 · Accepted Answer · answered Jan 14 '18 at 14:07

7

EF does not support interfaces, but you can deal with it this way. Take a look on this solution How to use interface properties with CodeFirst

answered Jan 14 '18 at 14:07

Nove124

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Do note that this question is referring to entity framework core, NOT entity framework. Does the same apply there? – Douglas Gaskell Jul 03 '19 at 20:39
Oh, hi me 2+ years later. This is disappointing.... Anyone got info on this? – Douglas Gaskell Oct 26 '21 at 04:48

Can I use an Interface as a property with Entity Framework?

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