Question

I’ve been using AutoMapper successfully for a while now. However, when I use MapFrom() in the CreateMap calls, I get the above error.

I have upgraded to version 2, and it seems the registries have been broken.

CreateMap<EmailInbound, EmailMessageModel>()
            .ForMember(dest => dest.Subject, opt => opt.MapFrom(src => src.Subject = (string.IsNullOrEmpty(src.Subject) ? "No Subject" : src.Subject)));

Any ideas what has broken here?

Answer 1

You are trying to do an assignment in lambda expression instead of returning a value. Here’s the fixed version.

CreateMap<EmailInbound, EmailMessageModel>()
.ForMember(dest => dest.Subject, opt => opt.MapFrom(src => string.IsNullOrEmpty(src.Subject) 
                                                         ? "No Subject" 
                                                         : src.Subject));