Automapper ResolveUsing或MapFrom

Question

我将映射定义定义为

Mapper.CreateMap<Calculator, CalculatorViewModel>()
  .ForMember(dest => dest.TypeIndicator, src => src.ResolveUsing(new TypeIndicatorResolver()));

我应该使用ResolveUsing还是MapFrom(src => SomePrivateMethod())？

ResolveUsing和MapFrom在复杂映射方面有什么区别.

Resolver或Private方法将转到数据库并获取值.

Answer 1

MapFrom使用表达式,而ResolveUsing使用Func.MapFrom只允许重定向属性:

ForMember(d => d.Foo, opt => opt.MapFrom(src => src.Bar.Baz.Foo))

ResolveUsing可以是任何东西

ForMember(d => d.Foo, opt => opt.ResolveUsing(src => HitDatabaseWithStuff(src));

当解析逻辑需要在多个成员之间共享时,或者如果我想让服务定位器实例化解析器时,我会使用Resolver类.否则,私有方法就可以了.