EF Core 2.0中的种子一对多关系

public class Order
{
    public int Id { get; set; }
    public string OrderNumber { get; set; }
    public ICollection<Product> Products { get; set; }
}

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public Order Order { get; set; }
    public int OrderId { get; set; }
}

public class OrderConfiguration : IEntityTypeConfiguration<Order>
{
    public void Configure(EntityTypeBuilder<Order> builder)
    {
        builder.HasData(
            new Order { Id = 1, OrderNumber = "ORD001" },
            new Order { Id = 2, OrderNumber = "ORD002" }
        );
    }
}

public class ProductConfiguration : IEntityTypeConfiguration<Product>
{
    public void Configure(EntityTypeBuilder<Product> builder)
    {
        builder.HasData(
            new Product { Id = 1, Name = "Product 1", OrderId = 1 },
            new Product { Id = 2, Name = "Product 2", OrderId = 1 },
            new Product { Id = 3, Name = "Product 3", OrderId = 2 }
        );
    }
}

public class ApplicationDbContext : DbContext
{
    public DbSet<Order> Orders { get; set; }
    public DbSet<Product> Products { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.ApplyConfiguration(new OrderConfiguration());
        modelBuilder.ApplyConfiguration(new ProductConfiguration());
    }
}