C#中的Explicit和Implicit详情

if (dto.Payment == null) continue;
 
var entity = entries.FirstOrDefault(e => e.LedgerEntryID == dto.LedgerEntryID);
 
dto.Payment = entity?.Payment;

    public static implicit operator PaymentDTO(Payment payment)
 

    public class Payment
    {
         public decimal Amount { get; set; }

    }
    public class PaymentDTO

    {
         public string AmountString { get; set; }
    }
 

        public class PaymentDTO
        {
            public string AmountString { get; set; }

           public static implicit operator PaymentDTO(Payment payment)

            {
                return new PaymentDTO

                {
                    AmountString = payment.Amount.ToString("C2")
                };

            }
        }

     class Program
        {
            static void Main(string[] args)
            {
                PaymentDTO dto = new Payment { Amount = 1 };

 

                Console.WriteLine(dto.AmountString);

                Console.Read();

            }
        }

 
        public class PaymentDTO

        {

            public string AmountString { get; set; }
            public static explicit operator PaymentDTO(Payment payment)

            {

               return new PaymentDTO

                {
                    AmountString = payment.Amount.ToString("C2")

                };
            }
        }

        class Program

        {
            static void Main(string[] args)
            {
                PaymentDTO dto = (PaymentDTO)new Payment { Amount = 1 };

                Console.WriteLine(dto.AmountString);

               Console.Read();

            }
        }