Question

I can’t get this to work:

Mapper.CreateMap<Source, Destination>();

var context = new MyDbContext();

var source = new Source();
var destination= context.Destinations.First();

Mapper.Map<Source, Target>(source, destination)

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

This works:

Mapper.CreateMap<Source, Destination>();

var source = new Source();
var destination= new Destination();

Mapper.Map<Source, Target>(source, destination)

The entity framework is creating a dynamic proxy class for my Destination class is that the reason it doesn’t work?

Without destination parameter it works as well i.e.:

var destination = Mapper.Map<Source, Target>(source);

Answer 1

This one is a bug and is fixed on the develop branch of AutoMapper. The prerelease version of AutoMapper has the fix, or wait a little bit for the 2.2.1 release.