static void Main(string[] args)
{
　　　　　　//創建上下文對象
            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訂單2";
            dbEntities.OrderInfo.Add(orderInfo);

            //第二張增加 用客戶指向訂單
            customer.OrderInfo.Add(orderInfo);

            dbEntities.SaveChanges();

}

ef 多表添加（關聯）