EF Core Mapping EntityTypeConfiguration

Question

In EF6 we usually able to use this way to configure the Entity.

public class AccountMap : EntityTypeConfiguration
{
    public AccountMap()
           


        

Answer 1

I ended with this solution:

public interface IEntityMappingConfiguration
{
    void Map(ModelBuilder b);
}

public interface IEntityMappingConfiguration : IEntityMappingConfiguration where T : class
{
    void Map(EntityTypeBuilder builder);
}

public abstract class EntityMappingConfiguration : IEntityMappingConfiguration where T : class
{
    public abstract void Map(EntityTypeBuilder b);

    public void Map(ModelBuilder b)
    {
        Map(b.Entity());
    }
}

public static class ModelBuilderExtenions
{
    private static IEnumerable GetMappingTypes(this Assembly assembly, Type mappingInterface)
    {
        return assembly.GetTypes().Where(x => !x.IsAbstract && x.GetInterfaces().Any(y => y.GetTypeInfo().IsGenericType && y.GetGenericTypeDefinition() == mappingInterface));
    }

    public static void AddEntityConfigurationsFromAssembly(this ModelBuilder modelBuilder, Assembly assembly)
    {
        var mappingTypes = assembly.GetMappingTypes(typeof (IEntityMappingConfiguration<>));
        foreach (var config in mappingTypes.Select(Activator.CreateInstance).Cast())
        {
            config.Map(modelBuilder);
        }
    }
}

Sample Use:

public abstract class PersonConfiguration : EntityMappingConfiguration
{
    public override void Map(EntityTypeBuilder b)
    {
        b.ToTable("Person", "HumanResources")
            .HasKey(p => p.PersonID);

        b.Property(p => p.FirstName).HasMaxLength(50).IsRequired();
        b.Property(p => p.MiddleName).HasMaxLength(50);
        b.Property(p => p.LastName).HasMaxLength(50).IsRequired();
    }
}

and

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.AddEntityConfigurationsFromAssembly(GetType().Assembly);
}