Automapper ResolveUsing原因和QUOT;无法解析这可查询前pression＆QUOT;

问题描述

我使用autommaper映射域类模型类，反之亦然。我需要加密/解密的一个属性。当我映射模型域名没有问题，工作perefectly：

  Mapper.CreateMap＆LT; EntityModel，实体方式＆gt;（）ForMember（DEST =＆GT; dest.Password，选择=＆GT; opt.ResolveUsing（SRC =＆GT; this.EncryptString（SRC 。密码）））
 

但是，当实体映射到模型automapper崩溃，并引发无法解析这可查询前pression

  Mapper.CreateMap＆LT;实体，EntityModel方式＆gt;（）ForMember（DEST =＆GT; dest.Password，选择=＆GT; opt.ResolveUsing（SRC =＆GT; this.DecryptString（SRC 。密码）））
 

我和一个自定义值解析器尝试过，用同样的结果：

  Mapper.CreateMap＆LT;实体，EntityModel＆GT;（）ForMember（DEST =方式＆gt; dest.Password，OP =＆GT; op.ResolveUsing＆LT; PasswordResolver方式＆gt;（）FromMember（X = ＆GT; x.Password））;
公共类PasswordResolver：ValueResolver＆LT;对象，字符串＆GT;
{
        保护覆盖字符串ResolveCore（对象源）
    {
        返回TEST;
    }}
 

解决方案

作为文档状态，你不能使用可查询前pressions定制解析器：

的

您可以，但是，使用MapFrom：

  Mapper.CreateMap＆LT;实体，EntityModel＆GT;（）
    .ForMember（DEST =＆GT; dest.Password，OP =＆GT; op.MapFrom（SRC =＆gt;中考））;
 

我猜那并不是你想为Password属性做什么，但是这就是你如何修复的例子。

I'm using autommaper to map domain classes to model classes and viceversa. I need to encrypt/decrypt one property. When I map Model to Domain there isn't problem, work perefectly:

Mapper.CreateMap<EntityModel, Entity>().ForMember(dest => dest.Password, opt => opt.ResolveUsing(src => this.EncryptString(src.Password)))

But when map Entity to Model automapper crash and throws "Can't resolve this to Queryable Expression":

Mapper.CreateMap<Entity, EntityModel>().ForMember(dest => dest.Password, opt => opt.ResolveUsing(src => this.DecryptString(src.Password)))

I've tried with a Custom Value Resolver too, with same result:

Mapper.CreateMap<Entity, EntityModel>().ForMember(dest => dest.Password, op => op.ResolveUsing<PasswordResolver>().FromMember(x => x.Password));


public class PasswordResolver : ValueResolver<object, string>
{
        protected override string ResolveCore(object source)
    {
        return "TEST";
    }

}

解决方案

As the documentation states, you can't use custom resolvers in queryable expressions:

https://github.com/AutoMapper/AutoMapper/wiki/Queryable-Extensions#supported-mapping-options

You can, however, use MapFrom:

Mapper.CreateMap<Entity, EntityModel>()
    .ForMember(dest => dest.Password, op => op.MapFrom(src => "TEST"));

I'm guessing that's not actually what you want to do for that Password property but that's how you can fix the example.

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