ef 多表添加（关联）

static void Main(string[] args){　　　　　　//创建上下文对象
            PpDbEntities dbEntities = new PpDbEntities();

            #region Add()

            //多表增加
            //
            Customer customer = new Customer();
            customer.Name = "mmm";
            dbEntities.Customer.Add(customer);

            //customer.ID = 5;
            //dbEntities.Entry(customer).State=EntityState.Deleted;
            //dbEntities.Entry<ProductInfo>(productInfo).State = EntityState.Deleted;

            //
            OrderInfo orderInfo = new OrderInfo();
            orderInfo.Name = "mmm订单2";
            dbEntities.OrderInfo.Add(orderInfo);
            //第二张增加 用客户指向订单
            customer.OrderInfo.Add(orderInfo);

            dbEntities.SaveChanges();
}