C# (CSharp) PaymentItems.Sum примеры использования

Пример #1

 public decimal TotalVat()
 {
     return(PaymentItems.Sum(x => x.VATAmount()));
 }

Пример #2

 public decimal TotalWithholdingTax()
 {
     return(PaymentItems.Sum(x => x.WithHoldingTaxAmount()));
 }

Пример #3

 public decimal TotalUnitAmount()
 {
     return(PaymentItems.Sum(x => x.SubTotal()));
 }