How to set field with another one

Cenk 956

Hello,

I have this OrderDetail class. I want to set the Currency field to ExtendedCurrency. Can I set it in the LINQ query below? Or is it possible to set it in the class?

Thank you.

public async Task<IEnumerable<Order?>> GetAllOrders()  
{  
   return await _db.Orders.Include(d => d.OrderDetails).ThenInclude(v => v.Vendor).ToListAsync();  
}  

public class OrderDetail  
    {  
        public int Id { get; set; }  
          
        [Required]  
        [MaxLength(100)]  
        public string ProductCode { get; set; }  
        [Required]  
        [MaxLength(250)]  
        public string ProductName { get; set; }  
        [Required]  
        public int BuyQuantity { get; set; }  
        [Required]  
        public int SellQuantity { get; set; }  
        public double CostRatio { get; set; }  
        public double UnitCost { get; set; }  
        public double TotalBuyPrice { get; set; }  
        public double TotalSellPrice { get; set; }  
        [MaxLength(150)]  
        public string ShippingNumber { get; set; }  
        public string Status { get; set; }  
        [MaxLength(150)]  
        public string TrackingNumber { get; set; }  
        [MaxLength(400)]  
        public string Description { get; set; }  
  
        public string Currency { get; set; }  
        public int OrderId { get; set; }  
        public int VendorId { get; set; }  
        public Order Order { get; set; }  
        public Vendor Vendor { get; set; }  
        [NotMapped] public string? ExtendedCurrency { get; set; }  
  
    }

Karen Payne MVP 35,036 Reputation points

2022-08-12T07:50:16.75+00:00

How is ExtendedCurrency going to be used?
Viorel 112.5K Reputation points

2022-08-12T08:39:12.877+00:00

Do you need something like this?

public string Currency { get { return ExtendedCurrency;} set { ExtendedCurrency = value; }
Cenk 956 Reputation points

2022-08-12T09:09:52.947+00:00

Could it be possible setting both Currency and ExtendedCurrency?

Cenk 956

I tried like this but ExtendedCurrency is Null.

private string _currency;  
        public string Currency  
        {  
            get { return _currency; }  
            set  
            {  
                _currency = value;  
                ExtendedCurrency = value;  
            }  
        }  
  
        
        [NotMapped] public string? ExtendedCurrency { get; set; }

AgaveJoe 26,136 Reputation points

2022-08-12T12:40:58.59+00:00

You specially defined ExtendedCurrency as a nullable string and the property is not mapped to table column. Therefore, your design must set ExtendedCurrency at some point during run-time. Where is the code that sets Currency? Keep in mind, setting Currency must happen before getting ExtendedCurrency.

This design has a bad smell.

Karen Payne MVP 35,036

Perhaps

public class OrderDetail  
{  
    public string Currency { get; set; }  
    [NotMapped] public string ExtendedCurrency => Currency;  
}