Access MemberName/PropertyMap from ResolutionContext in an Automapper custom ValueResolver - automapper

Question

I need to trace any complex (i.e. non-default) mappings in our project.
To achieve this, I'm using a custom value resolver, and publishing out a log event during resolution. As part of this message I'd like to know the destination member being mapped, which I was hoping to find in source.Context.MemberName - but this is always null.
ValueResolver:
public class Resolver : IValueResolver
{
public event MappingEventHandler MappingEvent;
public delegate void MappingEventHandler(MappingMessage m);
public ResolutionResult Resolve(ResolutionResult source)
{
var src = (SourceDTO)source.Context.SourceValue;
if (!String.IsNullOrWhiteSpace(src.Status) && src.Status == "Alert")
{
var newValue = source.Value + " - Fail";
var fieldName = source.Context.MemberName; //Always null
MappingEvent(new MappingMessage(fieldName , newValue));
return source.New(value, typeof(String));
}
return source;
}
}
... and its usage:
Resolver resolver = new Resolver();
//... subscribe to resolver events etc.
Mapper.CreateMap<SourceDTO, Common>()
.ForMember(dest => dest.ReferenceIdentifier
, opt => opt.ResolveUsing<Resolver>()
.FromMember(src => src.Reference)
.ConstructedBy(() => resolver)
I can see in the Automapper code that MemberName only returns if the PropertyMap is non-null, and since PropertyMap is null in this case, I'm not getting my MemberName back.
Is there a reason the PropertyMap isn't being defined in this here? There's a relevant candidate via source.Context.TypeMap.GetPropertyMaps(), but it's not being pushed into this context.
Any ideas? Perhaps there's a means of pulling the right PropertyMap out of the Context.TypeMap set?

Answer 1

Tried with the more recent Automapper build - looks like the problem has been resolved.
Version with issue: 2.1.266
Working version: 2.2.1
Also found it's a lot easier to use the following syntax to resolve from an existing instance:
Resolver resolver = new Resolver();
//... subscribe to resolver events etc.
Mapper.CreateMap<SourceDTO, Common>()
.ForMember(dest => dest.ReferenceIdentifier
, opt => opt.ResolveUsing(resolver)
.FromMember(src => src.Reference) )