使用Automapper进行深层映射 [英] Deep level mapping using Automapper

问题描述

我正在尝试使用多级成员映射对象: 这些是类:

I am trying to map objects with multi-level members: these are the classes:

 public class Father
    {
        public int Id { get; set; }
        public Son Son { get; set; }
    }

    public class FatherModel
    {
        public int Id { get; set; }
        public int SonId { get; set; }
    }

    public class Son
    {
        public  int Id { get; set; }
    }

这是我尝试自动映射的方式:

This is how I try automap it:

 AutoMapper.Mapper.CreateMap<FatherModel , Father>()
                      .ForMember(dest => dest.Son.Id, opt => opt.MapFrom(src => src.SonId));

这是我得到的例外:

表达式'dest => Convert(dest.Son.Id)'必须解析为顶级 成员，而不是任何子对象的属性.在上使用自定义解析器 子类型或AfterMap选项.参数名称: lambdaExpression

Expression 'dest => Convert(dest.Son.Id)' must resolve to top-level member and not any child object's properties. Use a custom resolver on the child type or the AfterMap option instead. Parameter name: lambdaExpression

谢谢

推荐答案

这既适用于映射到新对象，也适用于现有对象.

This will work both for mapping to a new or to an existing object.

Mapper.CreateMap<FatherModel, Father>()
    .ForMember(x => x.Son, opt => opt.MapFrom(model => model));
Mapper.CreateMap<FatherModel, Son>()
    .ForMember(x => x.Id, opt => opt.MapFrom(model => model.SonId));

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