Automapper Mapping Complex nested Objects

Question

I am currently facing an error whilst trying to map data objects as shown below;

Method 'get_Item' in type 'Proxy_System.Collections.Generic.IList`1[[InsureAfrika_API.Model.DataModel, InsureAfrika API, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]_28141317_' from assembly 'AutoMapper.Proxies, Version=0.0.0.0, Culture=neutral, PublicKeyToken=be96cd2c38ef1005' does not have an implementation.

Below are my data sources; QuoteSourceDto

public string ResponseStatus { get; set; }
public IList<Data> Data { get; set; }

DataClass

public string Client { get; set; }
public IList<Extensions> Extensions { get; set; }

Extensions Source Class

public Decimal Limit { get; set; }
public Decimal Rate { get; set; }

My Destination Class; QuoteDestinationModel

public string ResponseStatus { get; set; }
public IList<DataModel> Data { get; set; }

DataModel

public string Client { get; set; }
public IList<ExtensionsModel> Extensions { get; set; }

ExtensionModel Class

public Decimal Limit { get; set; }
public Decimal Rate { get; set; }

Below is my mapper configuration;

var config = new MapperConfiguration(cfg => {
   cfg.CreateMap<IList<Extensions>, IList<ExtensionsModel>>();
   cfg.CreateMap<IList<Data>, IList<DataModel>>();

   cfg.CreateMap<QuoteSourceDto, QuoteDestinationModel>()
                    .ForMember(dest => dest.Data, opt => opt.MapFrom(src => src.Data))
                    .ForMember(dest => dest.ResponseStatus, opt => opt.Ignore());
})

My Data Source;

IList<Extensions> exts =new List<Extensions>
{
   new Extensions{Rate=1.34M,Limit=21400.00M};
}

IList<Data> dat = new List<Data>
{
  new Data{Client="Micael Angelus", Extensions =exts};
};

QuoteSourceDto dtos = new QuoteSourceDto
{
     ResponseStatus = "Success",
     Data = dat
};

Thus my Map function call is as shown below;


var _client = mapper.Map<QuoteSourceDto, QuoteDestinationModel>(dtos);

When I use type List it returns no error and no result just an empty list and when I use IList it returns the stated error above. All I want to do is map results to QuoteDestinationModel.

EDIT I'm Using Automapper Version 9.0.0

I've spent 3hrs debugging using their documentation and I still haven't figured out why I'm getting this error. — John Nyingi
– John Nyingi, Commented Dec 10, 2019 at 8:25
There are many examples available online. Try the tests in the AM repo. — Lucian Bargaoanu
– Lucian Bargaoanu, Commented Dec 10, 2019 at 9:45

Prolog · Accepted Answer · 2019-12-13 20:47:13Z

AutoMapper documentation states:

"AutoMapper only requires configuration of element types, not of any array or list type that might be used. " ~ Documentation

What that means is that you don't have to (and you shouldn't) create mapping profiles between particular types of collections (using generic type parameter), like you did:

// Don't do that!
cfg.CreateMap<IList<Extensions>, IList<ExtensionsModel>>();

Instead, create mapping profiles between concrete types:

var config = new MapperConfiguration(cfg =>
{
    cfg.CreateMap<Extensions, ExtensionsModel>();
    cfg.CreateMap<Data, DataModel>();
    cfg.CreateMap<QuoteSourceDto, QuoteDestinationModel>()
        .ForMember(dest => dest.ResponseStatus, opt => opt.Ignore());
});

and AutoMapper will create a collection for you. Types of source collections supported:

IEnumerable
IEnumerable<T>
ICollection
ICollection<T>
IList
IList<T>
List<T>
Array

Notice that I removed the configuration part telling AutoMapper how to map between Data members. As both - source and destination - models have the same name, which is just Data, AutoMapper will map them just fine without explicitly telling it how to do that. That is, if you previously create a map between Data and DataModel types in configuration.

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