Automapper: Mapping an object to a LIST

Question

I have a typeSupportedCurrencies that contains a list of objects of type Currency:

  public class SupportedCurrencies
        {
            public List<Currency> Currencies { get; set; }
        }
  public class Currency
    {
        public string Code { get; set; }    
        public string AmountMin { get; set; }
        public string AmountMax { get; set; }
    }

And I want to map it to a list of objects of type SupportedCurrency:

    public class SupportedCurrency
    {
        public string CurrencyCode { get; set; }
        public string MinAmount { get; set; }
        public string MaxAmount { get; set; }
    }

In my mapping profile I have the following mappings:

CreateMap<Response.Currency, SupportedCurrency>()
            .ForMember(p => p.MinAmount, q => q.MapFrom(r => r.AmountMin))
            .ForMember(p => p.MaxAmount, q => q.MapFrom(r => r.AmountMax))
            .ForMember(p => p.CurrencyCode, q => q.MapFrom(r => r.Code));

CreateMap<SupportedCurrencies, IList<SupportedCurrency>>().ConvertUsing(MappingFunction);

And the converter looks like this:

 private IList<SupportedCurrency> MappingFunction(SupportedCurrencies arg1, IList<SupportedCurrency> arg2, ResolutionContext arg3)
        {
            foreach (var item in arg1.Currencies)
            {
                arg2.Add(arg3.Mapper.Map<SupportedCurrency>(item)); 
            }
            return arg2;
        }

But when I try to map it:

_mapper.Map<IList<SupportedCurrency>>(obj01.SupportedCurrencies);

I get back an exception saying:

Method 'get_Item' in type 'Proxy_System.Collections.Generic.IList`1 is not implemented.

What am I doing wrong?

score 1 · Accepted Answer · answered Jul 08 '21 at 11:37

static version of CreateMap is removed: AutoMapper.Mapper does not contain definition for CreateMap

I do not know whether you have choice of upgrading. But with latest AutoMapper (10.1.1), following code works (you did not give the completed code so I created object of SupportedCurrencies)

            var config = new MapperConfiguration(cfg => {
                cfg.CreateMap<Currency, SupportedCurrency>()
                    .ForMember(p => p.MinAmount, q => q.MapFrom(r => r.AmountMin))
                    .ForMember(p => p.MaxAmount, q => q.MapFrom(r => r.AmountMax))
                    .ForMember(p => p.CurrencyCode, q => q.MapFrom(r => r.Code));

            });


            SupportedCurrencies supportedCurrencies = new SupportedCurrencies();
            IMapper mapper = config.CreateMapper();
            mapper.Map<IList<SupportedCurrency>>(supportedCurrencies);

Automapper: Mapping an object to a LIST

1 Answers1