英文:
Map Different Concrete Types to Collection of Interface
问题
我在使用AutoMapper将不同的具体类型映射到一个接口集合时遇到困难。例如：
领域模型：
public interface INameInterface {string Name;}public class FullName : INameInterface {string Name;}public class FirstNameOnly : INameInterface {string Name;}public class MyDomain {List<INameInterface> Names;}
DTO模型：
public class NameDTO {int NameType;string Name;}public class MyDTO {List<NameDTO> NameDTOs;}
我想将MyDTO映射到MyDomain。我想根据NameDTO的NameType解析它，并将NameType 1映射到FullName，将NameType 2映射到FirstNameOnly的具体类，并将它们放在MyDomain.Names集合中。如何在AutoMapper中实现这个目标？
非常感谢任何帮助。
注：示例已经简化。
英文:
I'm having difficulty in mapping different concrete types to a single collection of interface in automapper. For example:
Domain:
public interface INameInterface {string Name;}public class FullName: INameInterface {string Name;}public class FirstNameOnly: INameInterface {string Name;}public class MyDomain {List<INameInterface> Names;}
DTOs:
public class NameDTO {int NameType;string Name;}public class MyDTO {List<NameDTO> NameDTOs;}
I would like to map MyDTO to MyDomain. I would like to resolve NameDTO by its NameType and map NameTypes 1 to Fullname and 2 to FirstNameOnly concrete classes and place them in MyDomain.Names collection. How can I do it in automapper.
Any help is highly appreciated.
PS. Example is simplified
答案1
得分: 1
可以使用自定义类型转换器来解决这个问题。
在automapper配置中：
cfg.CreateMap<NameDTO, INameInterface>().ConvertUsing<SomeConverter>();
然后创建自定义转换器类。
public class SomeConverter : ITypeConverter<NameDTO, INameInterface>{public INameInterface Convert(NameDTO source, INameInterface destination, ResolutionContext context){if (source.NameType == 0){return context.Mapper.Map<FullName>(source);}if (source.NameType == 1){return context.Mapper.Map<FirstNameOnly>(source);}return context.Mapper.Map<FirstNameOnly>(source);}}
只需为每个具体类型添加必要的映射。
不过需要注意的是，我尝试在投影中使用这种方法，但这不会起作用，因为它无法转换为表达式。
英文:
This can be solved using custom type converter.
In automapper config:
cfg.CreateMap<NameDTO, INameInterface>().ConvertUsing<SomeConverter>();
Then create the custom converter class.
public class SomeConverter : ITypeConverter<NameDTO, INameInterface>{public INameInterface Convert(NameDTO source, INameInterface destination, ResolutionContext context){if (source.NameType == 0){return context.Mapper.Map<FullName>(source);}if (source.NameType == 1){return context.Mapper.Map<FirstNameOnly>(source);}return context.Mapper.Map<FirstNameOnly>(source);}}
Just add the necessary mapping for each concrete types.
Warning tho, I have tried to use this approach in projection but this won't work as it cannot be converted to an expression.
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