C＃注文した在庫量を変更する

Question

注文後、ShoppingCartの数量を使用して、データベースの商品数量を調整し、購入可能在庫を引き下げますか？ここで

は私のクラス、作成順序

public int CreateOrder(Order order) 
    { 
     decimal orderTotal = 0; 

     var cartItems = GetCartItems(); 

     // Iterate over the items in the cart, adding the order details for each 
     foreach (var item in cartItems) 
     { 
      var orderDetail = new OrderDetail 
      { 
       ProductId = item.ProductId, 
       OrderId = order.OrderId, 
       UnitPrice = item.Product.Price, 
       Quantity = item.Count 
      }; 
      // Set the order total of the shopping cart 
      orderTotal += (item.Count * item.Product.Price); 

      storeDB.OrderDetails.Add(orderDetail); 

     } 
     // Set the order's total to the orderTotal count 
     order.Total = orderTotal; 

     // Save the order 
     storeDB.SaveChanges(); 
     // Empty the shopping cart 
     EmptyCart(); 
     // Return the OrderId as the confirmation number 
     return order.OrderId; 
    } 

私の注文クラス

[Bind(Exclude = "OrderId")] 
public partial class Order 
{ 
    [ScaffoldColumn(false)] 
    public int OrderId { get; set; } 

    [ScaffoldColumn(false)] 
    public System.DateTime OrderDate { get; set; } 

    [ScaffoldColumn(false)] 
    [Remote("CheckUserName", "Account")] 
    public string Username { get; set; } 

    [Required] 
    [StringLength(16, ErrorMessage = "Your name is too long")] 
    [Display(Name = "First Name")] 
    public string FirstName { get; set; } 

    [Required(ErrorMessage = "Your last name is required.")] 
    [StringLength(16, ErrorMessage = "Last name is too long.")] 
    [Display(Name = "Last Name")] 
    public string LastName { get; set; } 

    [Required(ErrorMessage = "Address is required.")] 
    public string Address { get; set; } 

    [Required(ErrorMessage = "City is required.")] 
    public string City { get; set; } 

    [Required(ErrorMessage = "Postcode is required.")] 
    [Display(Name = "Post Code")] 
    public string PostalCode { get; set; } 

    [Required(ErrorMessage = "Country is required.")] 
    public string Country { get; set; } 

    [Required(ErrorMessage = "Phone number is required.")] 
    public string Phone { get; set; } 

    [RegularExpression(@"[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}", ErrorMessage = "Email doesn't look like a valid email address.")] 
    public string Email { get; set; } 

    [System.ComponentModel.DataAnnotations.Compare("Email")] 
    [Display(Name = "Confirm your email address")] 
    public string EmailConfirm { get; set; } 


    [ScaffoldColumn(false)] 
    public string PaymentTransactionId { get; set; } 


    [ScaffoldColumn(false)] 
    public bool HasBeenShipped { get; set; } 

    [ScaffoldColumn(false)] 
    [ReadOnly(true)] 
    public decimal Total { get; set; } 

    public CardDetails cardDetails { get; set; } 
    //public List<CardDetails> cardDetails { get; set; } 
    public List<OrderDetail> OrderDetails { get; set; } 
} 

マイCheckOutController

[HttpPost] 
     public ActionResult AddressAndPayment(FormCollection values) 
     { 
      var order = new Order(); 
      TryUpdateModel(order); 

      //try 
      //{ 
       //if (string.Equals(values["PromoCode"], PromoCode, StringComparison.OrdinalIgnoreCase) == false) 
       //{ 
       // return View(order); 
       //} 
       //else 
       //{ 
        order.Username = User.Identity.Name; 
        order.OrderDate = DateTime.Now; 

        //Order gets saved 
        storeDB.Orders.Add(order); 
        storeDB.SaveChanges(); 
        //Order gets processed 
        var cart = ShoppingCart.GetCart(this.HttpContext); 
        cart.CreateOrder(order); 

        //NEW TEST IF SAVES 
        storeDB.SaveChanges(); 

        //Model.Product.stock = item.Product.stock - item.count; 



        return RedirectToAction("Complete", 
         new { id = order.OrderId }); 

たOrderDetailsクラス

と ShoppingCartのクラスです

public class OrderDetail 
{ 
    public int OrderDetailId { get; set; } 
    public int OrderId { get; set; } 
    public int ProductId { get; set; } 
    public int Quantity { get; set; } 
    public decimal UnitPrice { get; set; } 
    public virtual Product Product { get; set; } 
    public virtual Order Order { get; set; } 
} 

Answer 1

あなたは、製品の詳細情報を取得し、あなたのShoppingCartクラス

// Get the product 
    var product = storeDB.Products 
     .Single(products => products.productID == item.ProductId); 

    //Deduce available stock based on item in carts 
    product.productQty = product.productQty - item.Count; 

    storeDB.saveChanges(); 

まずのforeachループでこれらの次のコードを追加して、どのように多くの項目行うcart.Finallyであるに基づいて、製品の在庫を推測することができますsaveChanges（）をdatabase. Saveに保存してください。これは役に立ちます:)