Entity Framework Code First - Configuration in another file

Question

What is the best way to separate the mapping of tables to entities using the Fluent API so that it is all in a separate class and not inline in the OnModelCreating method?

What I am doing currently:

public class FooContext : DbContext {
    // ...
    protected override OnModelCreating(DbModelBuilder modelBuilder) {
        modelBuilder.Entity<Foo>().Property( ... );
        // ...
    }
}

What i want:

public class FooContext : DbContext {
    // ...
    protected override OnModelCreating(DbModelBuilder modelBuilder) {
        modelBuilder.LoadConfiguration(SomeConfigurationBootstrapperClass);
    }
}

How do you do this? I am using C#.

Daniel Pratt · Accepted Answer · 2011-09-19 18:31:28Z

20

You will want to create a class that inherits from the EntityTypeConfiguration class, like so:

public class FooConfiguration : EntityTypeConfiguration<Foo>
{
    public FooConfiguration()
    {
        // Configuration goes here...
    }
}

Then you can load the configuration class as part of the context like so:

public class FooContext : DbContext
{
    protected override OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new FooConfiguration());
    }
}

This article goes into greater detail on using configuration classes.

answered Sep 19, 2011 at 18:31

Daniel Pratt

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