Automapper-继承映射器不适用于类型转换器 [英] Automapper - Inheritance mapper not working with type converter

问题描述

不能同时使用映射继承和TypeConverter.

Can't use Mapping Inheritance and TypeConverter together.

我有此代码:

/* BaseClassTypeConverter.cs */
public class BaseClassTypeConverter : ITypeConverter<SourceClass, BaseClass> {
    public BaseClass Convert(ResolutionContext context) {
        if (context == null || context.IsSourceValueNull)
            return null;

        var src = (SourceClass)context.SourceValue;

        return new BaseClass() {
            CommonAttr = src.SourceAttr
        };
    }
}

/* AutoMapperConfig.cs */
public static class AutoMapperConfig {

    public static void RegisterMappings() {
        AutoMapper.Mapper.Initialize(config => {
            config
                .CreateMap<SourceClass, BaseClass>()
                .Include<SourceClass, DerivedClass1>()
                .Include<SourceClass, DerivedClass2>()  
                .ForMember(dest => dest.CommonAttr, o => o.MapFrom(src => src.SourceAttr));
                //.ConvertUsing<BaseClassTypeConverter>(); //  NOT WORKING

            config
                .CreateMap<SourceClass, DerivedClass1>()
                .ForMember(dest => dest.Dummy, o => o.MapFrom(src => src.SourceAttr2))
                .IncludeBase<SourceClass, BaseClass>();
        });
    }
}

如您所见，我希望能够从TypeConverter类进行映射，因为我要做一些更复杂的计算，而不仅仅是如上所述的赋值.

As you can see, I want to be able to map from a TypeConverter class, because I have some more complex computations to do, not just assign values as above.

当我使用类型转换器时，映射不起作用，但是当我删除ConvertUsing并在ForMember中使用内联映射时，一切都很好.

When I use the type converter the mappings don't work, however when I remove the ConvertUsing and use inline mapping with ForMember all works just fine.

这是我想念的东西吗?

PD.我正在使用:AutoMapper:version ="4.2.1"，targetFramework ="net452"

PD. I'm using: AutoMapper: version="4.2.1", targetFramework="net452"

推荐答案

不，您不能将ConvertUsing与其他任何东西组合使用.使用自定义类型转换器后，映射就完全取决于您了.这就是"ConvertUsing"返回"void"的原因，这是一个信号，表明您已经完成了配置谢谢".

Nope, you can't combine ConvertUsing and anything else. Once you use a custom type converter, the mapping is then completely up to you. That's why "ConvertUsing" returns "void", that's a signal saying "you're done with config thank you".

但是，您可以使用ConstructUsing来构建初始目标对象.或自定义的AfterMap，它也是继承的.只是不使用ConvertUsing.

However, you CAN use ConstructUsing to build out the initial destination object. Or a custom AfterMap, that's also inherited. Just not ConvertUsing.

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