AutoMapper可以在值类型（枚举）和引用类型之间进行映射吗？ （串）

Question

Weird problem - i'm trying to map between an enum and a string , using AutoMapper:

Mapper.CreateMap<MyEnum, string>()
   .ForMember(dest => dest, opt => opt.MapFrom(src => src.ToString()));

Don't worry that im using .ToString() , in reality i'm using an extension method on the enum itself ( .ToDescription() ), but i've kept it simple for the sake of the question.

The above throws an object reference error, when im doing simply setting up the mapping.

Considering this works:

string enumString = MyEnum.MyEnumType.ToString();

I can't see why my AutoMapper configuration does not.

Can AutoMapper handle this, am i doing something wrong, or is this a bug with AutoMapper?

Any ideas?

EDIT

I also tried using a custom resolver:

Mapper.CreateMap<MyEnum, string>()
                .ForMember(dest => dest, opt => opt.ResolveUsing<MyEnumResolver>());

public class MyEnumResolver: ValueResolver<MyEnum,string>
{
   protected override string ResolveCore(MyEnum source)
   {
      return source.ToString();
   }
}

Same error on same line. :(

Answer 1

For mapping between two types where you're taking control of the entire mapping, use ConvertUsing:

Mapper.CreateMap<MyEnum, string>().ConvertUsing(src => src.ToString());

All the other methods assume you're mapping to individual members on the destination type.