自动映射器-使用IEnumerable< anotherType>映射对象 [英] Automapper - Map objects with IEnumerable<anotherType>

问题描述

已解决:我的属性定义不正确！

SOLVED: I had a property defined incorrectly!

我收到此错误... 缺少类型映射配置或不支持的映射. 映射类型: HouseDomain-> RoomDomain {namespace} .HouseDomain-> {namespace} .RoomDomain

I'm getting this error... Missing type map configuration or unsupported mapping. Mapping types: HouseDomain -> RoomDomain {namespace}.HouseDomain -> {namespace}.RoomDomain

目标路径: City.Houses.Houses.Houses0 [0]

Destination path: City.Houses.Houses.Houses0[0]

例如，我有

public class CityDomain
{
    public IEnumerable<HouseDomain> DomainHouses {get;set;}
}
public class HouseDomain
{
    public IEnumerable<RoomDomain> DomainRooms {get;set;}
}    
public class RoomDomain
{
    //whatever
}

和

public class CityDto
{
    public IEnumerable<HouseDto> DtoHouses {get;set;}
}
public class HouseDto
{
    public IEnumerable<RoomDto> DtoRooms {get;set;}
}
public class RoomDto
{
    //whatever
}

所以我想将CityDomain映射到CityDto.我有...

So I want to map CityDomain to CityDto. I have...

Mapper.CreateMap<CityDomain , CityDto>();

是否存在像这样的两个层次的问题?有什么帮助吗?谢谢！

Is there an issue going 2 levels deep like this? Any help? Thanks!

推荐答案

这就是您需要的所有映射(如果已创建了适用于对象类型的映射，则Automapper足够聪明来映射对象列表):

This is all mappings you need (Automapper is smart enough to map lists of objects if mapping for appropriate object types was created):

Mapper.CreateMap<RoomDomain, RoomDto>();
Mapper.CreateMap<HouseDomain, HouseDto>()
      .ForMember(d => d.DtoRooms, m => m.MapFrom(s => s.DomainRooms));

只需删除成员DtoRooms的第二个映射.例如.如果房子有ID，房间有名字，那么对于示例域来说，房子映射就可以了:

Just remove your second mapping for member DtoRooms. E.g. if house has id and room has name, then for sample domain house mapping works just fine:

HouseDomain domainHouse = new HouseDomain
{
    Id = 42,
    DomainRooms = new List<RoomDomain>
    {
        new RoomDomain { Name = "foo" },
        new RoomDomain { Name = "bar" }
    }
};

var dtoHouse = Mapper.Map<HouseDto>(domainHouse);

产生:

{
   Id: 42,
   DtoRooms: [ { Name: "foo" }, { Name: "bar" } ]
}

最后一点-确保在进行映射之前先创建地图.通常，所有地图都是在应用程序启动时创建的.

Last note - make sure you create maps before you are doing mapping. Usually all maps are created on application startup.

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