自动映射器 - 根据映射的对象类型设置值
本文关键字:映射 对象 类型 设置 | 更新日期: 2024-10-25 15:53:26
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; }
}
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最初映射的类型(为什么我要这样做而不是有两个单独的DTO类?遗留代码,这就是为什么 - 太痛苦而无法改变这一切)。
理想情况下,我想在自动映射期间填充它,否则映射器会向我抛出一个摇摆不定的人,因为"类型"没有映射:
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));
但是我无法弄清楚这样做的语法。像这样:
//pseudo code
Mapper.CreateMap<DiaryEventType_dto, Entities.UserDiaryEventType>()
.SetValue("User");
Mapper.CreateMap<DiaryEventType_dto, Entities.SystemDiaryEventType>()
.SetValue("System");
可能吗?
ResolveUsing
允许您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"));