AutoMapper example

Assuming you have the following domain and a DTO type:

namespace AutoMapperExample.Domain;
{
    public record Payment(Iban BankAccountNumber, decimal Amount, string Currency);
}

namespace AutoMapperExample.Dtos;
{
    public record PaymentDto(string BankAccountNumber, decimal Amount, string Currency);
}

To map the Iban type to string and vice versa with AutoMapper, create a mapping profile class and inject IIbanParser. Then, create a two-way mapping between string and the Iban type.

public sealed class IbanMappingProfile : Profile
{
    public IbanMappingProfile(IIbanParser ibanParser)
    {
        CreateMap<string, Iban>().ConvertUsing(s => ibanParser.Parse(s));
        CreateMap<Iban, string>().ConvertUsing(s => s.ToString(IbanFormat.Electronic));
    }
}

Next, have another mapping profile in which you map between your domain model and DTO:

public sealed class MyProfile : Profile
{
    CreateMap<Payment, PaymentDto>().ReverseMap();
}

Make sure to register both mapping profiles with AutoMapper, and you're done!

See here for a similar working example.