Question

我需要帮助这个标题控制器

 public void SaveOrder(int magiam, string name, string phone)
    {
        ViewCart cartItm = new ViewCart();
        DonHang dh = new DonHang();
        //od.tblOrderDetails = details;
        dh.NgayTaoDH = DateTime.Now;
        dh.TenTK= Session["NhanVien"].ToString();
        Random cus_id = new Random();
        dh.MaKH = cus_id.Next();
        db.DonHangs.Add(dh);

        KhachHang kh = new KhachHang();
            db.KhachHangs.Add(kh);

        kh.MaKH = (int)dh.MaKH;

            kh.TenKH = name;
            kh.SDTKH = phone;
            db.KhachHangs.Add(kh);

        List<ViewCart> viewcart = (List<ViewCart>)Session["Cart"];
        foreach (var itm in viewcart)
        {

            ChiTietDonHang ctdh = new ChiTietDonHang();              
            ctdh.MaDH = dh.MaDH;
            ctdh.IDSP = itm.ID;
            ctdh.SoLuong = itm.SoLuong;
            ctdh.Gia = itm.Gia;
            ctdh.GiamGia = magiam;
            dh.TongGia = viewcart.Sum(p=>p.Gia*p.SoLuong) - (viewcart.Sum(p => p.Gia * p.SoLuong)*magiam)/100;
            db.ChiTietDonHangs.Add(ctdh);

            var model1 = db.SanPhams.ToList();
            foreach (var item in model1)
            {                  
                item.SoLuongSP = item.SoLuongSP - itm.SoLuong;
                db.SanPhams.Add(item);
            }
        }
        db.SaveChanges();
    }

当我将商品添加到购物车并点击付款完成时，我有错误

System.Data.Entity.Validation.DbEntityValidationException：＆＃39;验证一个或多个实体失败。请参阅＆＃39; EntityValidationErrors＆＃39;属性了解更多详情。＆＃39;

无法保存。

var model1 = db.SanPhams.ToList();
        foreach (var item in model1)
        {                  
            item.SoLuongSP = item.SoLuongSP - itm.SoLuong;
            db.SanPhams.Add(item);
        }

此代码关于减少数量

有人检查并帮助我，如果新的方式请帮助我。谢谢

将物品添加到购物车时减少产品数量

0 个答案: