在使用EF6的数据库设计中，如何适应父表的默认值？

// 父表实体类
public class Parent
{
    public int Id { get; set; }
    public string Name { get; set; }
    [DatabaseGenerated(DatabaseGeneratedOption.Computed)]
    public DateTime CreatedDate { get; set; }
}

// 子表实体类
public class Child
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int ParentId { get; set; }
    [ForeignKey("ParentId")]
    public virtual Parent Parent { get; set; }
}

// 数据库上下文类
public class MyDbContext : DbContext
{
    public DbSet<Parent> Parents { get; set; }
    public DbSet<Child> Children { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Child>()
            .HasRequired(c => c.Parent)
            .WithMany()
            .HasForeignKey(c => c.ParentId);
    }
}