自动映射器-根据映射对象的类型设置值

Question

这是我的DTO：

public class DiaryEventType_dto
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public string  Group { get; set; }
    public bool Redundant { get; set; }
    public string Type { get; set; }
}

并且它映射到两种可能的实体类型：

public partial class UserDiaryEventType
{
    public System.Guid Id { get; set; }
    public string Name { get; set; }
    public string TypeGroup { get; set; }
    public bool Redundant { get; set; }
}

public partial class SystemDiaryEventType
{
    public System.Guid Id { get; set; }
    public string Name { get; set; }
    public string TypeGroup { get; set; }
    public bool Redundant { get; set; }
}

“ Type”属性旨在区分DTO最初是从哪个类型映射的（为什么我要这样做而不是拥有两个单独的DTO类？传统代码，这就是为什么-很难全部更改）。

理想情况下，我想在自动映射过程中填充它，否则，映射器会向我扔一个摇摆器，因为未映射“类型”：

        Mapper.CreateMap<Entities.UserDiaryEventType, DiaryEventType_dto>()
            .ForMember(m => m.Group, o => o.MapFrom(s => s.TypeGroup));
        Mapper.CreateMap<DiaryEventType_dto, Entities.UserDiaryEventType>()
            .ForMember(m => m.TypeGroup, o => o.MapFrom(s => s.Group));
        Mapper.CreateMap<Entities.SystemDiaryEventType, DiaryEventType_dto>()
            .ForMember(m => m.Group, o => o.MapFrom(s => s.TypeGroup));
        Mapper.CreateMap<DiaryEventType_dto, Entities.SystemDiaryEventType>()
            .ForMember(m => m.TypeGroup, o => o.MapFrom(s => s.Group));

但是我不知道这样做的语法。 就像是：

//pseudo code
Mapper.CreateMap<DiaryEventType_dto, Entities.UserDiaryEventType>()
     .SetValue("User");
Mapper.CreateMap<DiaryEventType_dto, Entities.SystemDiaryEventType>()
     .SetValue("System");

可能吗？

Answer 1

ResolveUsing使您可以使用自定义值或计算。

Mapper.CreateMap<Entities.UserDiaryEventType, DiaryEventType_dto>()
        .ForMember(m => m.Group, o => o.MapFrom(s => s.TypeGroup))
        .ForMember(m => m.Group, o => o.ResolveUsing(s => "User"));