如何根据EF DbInitializer中的前一个对象中设置的Id使用linq设置id属性

public class YourDbContext : DbContext
{
    public DbSet<A> As { get; set; }
    public DbSet<B> Bs { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        Database.SetInitializer(new DbInitializer());
        base.OnModelCreating(modelBuilder);
    }

    public class DbInitializer : DropCreateDatabaseAlways<YourDbContext>
    {
        protected override void Seed(YourDbContext context)
        {
            // 创建A对象并设置Id属性
            var a = new A { Id = 1 };

            // 创建B对象并根据A对象的Id属性设置Id属性
            var b = new B { Id = context.As.FirstOrDefault(x => x.Id == a.Id)?.Id };

            // 将A和B对象添加到DbContext中
            context.As.Add(a);
            context.Bs.Add(b);

            base.Seed(context);
        }
    }
}