自动映射从一个对象到嵌套对象的映射

Question

使用Automapper 2.0映射内部对象的最佳方法是什么？

1. 使用此问题中的解决方案(Automapper 1.0)

2. 创建自定义值解析器

3. ？

   public class DTOObject
   {
       // MainObject
       public int Id { get; set; }
       public string Name { get; set; }
   
       // SubObject (TopObject)
       public string TopText { get; set; }
       public string TopFont { get; set; }
   
       // SubObject (BottomObject)
       public string BottomText { get; set; }
       public string BottomFont { get; set; }
   }
   
   public class MainObject
   {
       public int Id { get; set; }
       public string Name { get; set; }
   
       public SubObject TopObject { get; set; }
       public SubObject BottomObject { get; set; }
   }
   
   public class SubObject
   {
       public string SubPropText { get; set; }
       public string SubPropFont { get; set; }
   }
   

自定义值解析器

    public class CustomResolver : ValueResolver<DTOObject, SubObject>
    {
        protected override SubObject ResolveCore(DTOObject source)
        {
            return Mapper.Map<DTOObject, SubObject>(source);
        }
    }

Answer 1

对我来说,可以只使用MapFrom(没有ResolveUsing,这使你有机会使用这个映射与IQueryable扩展).因此,您将在Automapper配置中获得以下内容:

Mapper.CreateMap<DTOObject, SubObject>()
    .ForMember(dest => dest.SubPropText, opt => opt.MapFrom(x => x.BottomText))
    .ForMember(dest => dest.SubPropFont, opt => opt.MapFrom(x => x.BottomFont));

Mapper.CreateMap<DTOObject, MainObject>()
    .ForMember(dest => dest.SubPart, opt => opt.MapFrom(x => x));