Entity Framework - OnModelCreating with Model First

I have a Entity Framework model set up with text templates to generate the code. However, one of them creates the DBContext containing an OnModelCreating.

    protected override void O开发者_Python百科nModelCreating(DbModelBuilder modelBuilder)
    {
        throw new UnintentionalCodeFirstException();
    }

How do expand on this, since a partial class with the same override does not work.

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You cannot use OnModelCreating when using model first (EDMX). OnModelCreating is only for scenarios without using EDMX.

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Possibly your problem is that the connection string you're using is a standard SQL Server one rather than the Entity Framework one. See this answer.