結算畫面
購物車=>總計=>跳轉結算畫面
訂購人資訊
產品資訊
CartController
訂單資料表
訂單主表
訂單詳細資訊
OrderHeader
 public class OrderHeader
 {
     public int Id { get; set; }
     public string ApplicationUserId { get; set; }
     [ForeignKey("ApplicationUserId")]
     [ValidateNever]
     public ApplicationUser ApplicationUser { get; set; }
     [Required]
     public DateTime OrderDate { get; set; }
     public double OrderTotal { get; set; }
     public string? OrderStatus { get; set; }
     public string? PaymentStatus { get; set; }
     public DateTime PaymentDate { get; set; }
     public DateTime PaymentDueDate { get; set; }
     public string? SessionId { get; set; }
     [Required]
     public string PhoneNumber { get; set; }
     [Required]
     public string Address { get; set; }
     [Required]
     public string Name { get; set; }
 }
public class OrderDetail
{
    public int Id { get; set; }
    [Required]
    public int OrderHeaderId { get; set; }
    [ForeignKey("OrderHeaderId")]
    [ValidateNever]
    public OrderHeader OrderHeader { get; set; }
    [Required]
    public int ProductId { get; set; }
    [ForeignKey("ProductId")]
    [ValidateNever]
    public Product Product { get; set; }
    public int Count { get; set; }
    public double Price { get; set; }
    public string Color { get; set; }
    public string Size { get; set; }
}
public DbSet<OrderHeader> OrderHeaders { get; set; }
public DbSet<OrderDetail> OrderDetails { get; set; }
public IOrderHeaderRepository OrderHeader { get; private set; }
public IOrderDetailRepository OrderDetail { get; private set; }
OrderHeader = new OrderHeaderRepository(_db);
OrderDetail = new OrderDetailRepository(_db);
IOrderHeaderRepository OrderHeader { get; }
IOrderDetailRepository OrderDetail { get; }