[英]Mapping entity to dto with interfaces
我有从数据库检索的实体类:
public class User{
public string Username {get; set;}
public List<IAddress> Addresses {get; set;}
}
public class Address: IAddress{
public string Line1 {get; set;}
public string Line2 {get; set;}
}
public class AddressExtended:Address, IAddress{
public string Line3 {get; set;}
public string Line4 {get; set;}
}
public interface IAddress{
}
我使用Automapper
将此实体Automapper
到镜像的DTO:
public class UserDto{
[JsonProperty("username")]
public string Username { get; set; }
[JsonProperty("addresses")]
public List<IAddressDto> Addresses { get; set; }
}
public class AddressDto: IAddressDto{
[JsonProperty("line1")]
public string Line1 { get; set; }
[JsonProperty("line2")]
public string Line2 { get; set; }
}
public class AddressExtendedDto:AddressDto, IAddressDto{
[JsonProperty("line3")]
public string Line3 { get; set; }
[JsonProperty("line4")]
public string Line4 { get; set; }
}
public interface IAddressDto{
}
自动映射器的配置如下:
CreateMap<IAddress, IAddressDto>();
CreateMap<Address, AddressDto>();
CreateMap<AddressExtended, AddressExtendedDto>();
问题是,当我运行应用程序时,如果在实体中我有2个地址和1个AddressExtended,则在DTO中,Addresses属性()的映射如下:
[
{Proxy<MyProject.Models.Dto.IAddressDto_MyProject_Version=1.0.0.0_Culture=neutral_PublicKeyToken=null>},
{Proxy<MyProject.Models.Dto.IAddressDto_MyProject_Version=1.0.0.0_Culture=neutral_PublicKeyToken=null>},
{Proxy<MyProject.Models.Dto.IAddressDto_MyProject_Version=1.0.0.0_Culture=neutral_PublicKeyToken=null>}
]
正确设置了Username
属性。
我想念什么?
UPDATE
我在这里添加了一个提琴手:
据我所知,解决该问题的一种方法是使用以下代码构建
cfg.CreateMap<Address, AddressDto>();
cfg.CreateMap<AddressExtended, AddressExtendedDto>();
cfg.CreateMap<IAddress, IAddressDto>().ConstructUsing((IAddress addressDto) =>
{
if (addressDto is AddressExtended) return Mapper.Map<AddressExtendedDto>(addressDto);
return Mapper.Map<AddressDto>(addressDto);
});
编辑1:这是最终答案,它可以解决您的问题
cfg.CreateMap<Address, AddressDto>();
cfg.CreateMap<AddressExtended, AddressExtendedDto>();
cfg.CreateMap<IAddress, IAddressDto>().ConstructUsing((addressDto, ctx) =>
{
var destination = Mapper.Instance.ConfigurationProvider.GetAllTypeMaps()
.First(t => t.SourceType == addressDto.GetType());
return ctx.Mapper.Map(addressDto, addressDto.GetType(), destination.DestinationType) as IAddressDto;
});
无需使用LINQ获取目标类型,您可以构建字典并从中获取字典以更快地执行。
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