Automapper -AutoMapper.AutoMapperMappingException

Question

I trying out Automapper, with a really easy mapping, but it does not work. I am trying to map a System.Security.Claims.Claim type to another type ClaimItem:

public class ClaimItem
{
    public string Type { get; set; }
    public string Value { get; set; }
}

But I always get:

AutoMapper.AutoMapperMappingException: Missing type map configuration or unsupported mapping.

Mapping types: Claim -> ClaimItem System.Security.Claims.Claim -> CommonAuth.ClaimItem

Destination path: ClaimItem

Source value: http://schemas.xmlsoap.org/ws/2005/05/identity/claims/dateofbirth: 05.05.2016

Here is my configuration:

var config = new MapperConfiguration(cfg =>
{
    cfg.CreateMap<Claim, ClaimItem>(MemberList.Destination);
});

config.AssertConfigurationIsValid();

var cls = getClaims();
List<ClaimItem> list = new List<ClaimItem>();
cls.ForEach(cl => list.Add(Mapper.Map<ClaimItem>(cl)));

There must be text explanation what is wrong. Can you provide all text — Vova Bilyachat
Updated! :-) In my destination type I have only two props, Type and Value, I want these two properties to be mapped from the sourceType Claims. They have the same names in source and destination. — Legends
Where you get Mapper? because it should injected in version 4 — Vova Bilyachat
This is just a Unit test, where I run the code for testing. I thought Mapper is a wrapper, which has a reference to the config, right??? — Legends

Vova Bilyachat Vova Bilyachat · Accepted Answer · 2016-05-05T07:39:59

From the documentation you must create mapper from config. So you should have in your code smth like this

 private static Mapper _mapper;
    public static Mapper Mapper
    {
        get
        {
            if (_mapper == null)
            {
                var config = new MapperConfiguration(cfg =>
                {
                    cfg.CreateMap<Claim, ClaimItem>(MemberList.Destination);
                });

                config.AssertConfigurationIsValid();
                _mapper = config.CreateMapper();
            }
            return _mapper;
        }
    }

This means that if you have static Mapper it hould be created from config which you create

Automapper -AutoMapper.AutoMapperMappingException

1 Answers