[英]Automapper many to many mapping
帕特里克,感谢有关正确问题的建议!
编辑1:
我有三张关于多对多关系的表。 像这样:
GoodEntity:
public partial class GoodEntity
{
public GoodEntity()
{
this.GoodsAndProviders = new HashSet<GoodAndProviderEntity>();
}
public int id { get; set; }
public string name { get; set; }
public string description { get; set; }
public decimal cost { get; set; }
public Nullable<decimal> price { get; set; }
public virtual ICollection<GoodAndProviderEntity> GoodsAndProviders { get; set; }
}
ProviderEntity:
public partial class ProviderEntity
{
public ProviderEntity()
{
this.GoodsAndProviders = new HashSet<GoodAndProviderEntity>();
}
public int id { get; set; }
public string name { get; set; }
public string description { get; set; }
public string address { get; set; }
public string phone { get; set; }
public string email { get; set; }
public string url { get; set; }
public Nullable<int> rating { get; set; }
public virtual ICollection<GoodAndProviderEntity> GoodsAndProviders { get; set; }
}
多对多关系的实体:
public partial class GoodAndProviderEntity
{
public int id { get; set; }
public int good_id { get; set; }
public int provider_id { get; set; }
public virtual GoodEntity Goods { get; set; }
public virtual ProviderEntity Providers { get; set; }
}
GoodDTO:
public class GoodDTO
{
public int id { get; set; }
public string name { get; set; }
public string description { get; set; }
public decimal cost { get; set; }
public decimal? price { get; set; }
public IList<ProviderDTO> providers { get; set; }
}
ProviderDTO:
public class ProviderDTO
{
public int id { get; set; }
public string name { get; set; }
public string description { get; set; }
public string address { get; set; }
public string phone { get; set; }
public string email { get; set; }
public string url { get; set; }
public int? rating { get; set; }
}
这是创建地图的代码:
Mapper.CreateMap<ProviderDTO, ProviderEntity>();
Mapper.CreateMap<ProviderEntity, ProviderDTO>();
Mapper.CreateMap<GoodEntity, GoodDTO>()
.ForMember(dto => dto.providers, opt => opt.MapFrom(x => x.GoodsAndProviders));
Mapper.CreateMap<GoodAndProviderEntity, ProviderDTO>();
它的工作量减半。 Automapper已完全映射到“商品”,并为此商品的所有提供商创建了列表。 但是,automapper不会填补提供者。
如果我使用Mapper.AssertConfigurationIsValid(),那么:
找到了未映射的成员。 查看下面的类型和成员。 添加自定义映射表达式,忽略,添加自定义解析程序或修改源/目标类型============================== ========================= ProviderDTO - > ProviderEntity(目的地成员列表)Core.DTO.ProviderDTO - > DAL.EF.Entities.ProviderEntity(目的地)成员列表)未映射的属性:GoodsAndProviders =========================================== =================== GoodAndProviderEntity - > ProviderDTO(目标成员列表)DAL.EF.Entities.GoodAndProviderEntity - > Core.DTO.ProviderDTO(目标成员列表)
如何为多对多关系创建映射?
此致,安东
使用当前代码,您尝试将GoodAndProviderEntity映射到ProviderDTO。
Mapper.CreateMap<GoodEntity, GoodDTO>()
.ForMember(dto => dto.providers, opt => opt.MapFrom(x => x.GoodsAndProviders));
你想要做的是将ProviderEntity映射到ProviderDTO,所以你要做的就是从GoodsAndProviders中选择Providers作为列表:
Mapper.CreateMap<GoodEntity, GoodDTO>()
.ForMember(dto => dto.providers, opt => opt.MapFrom(x => x.GoodsAndProviders.Select(y => y.Providers).ToList()));
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