如何根据目标属性名称在 Automapper 中执行字符串查找？

发布于 2024-09-13 02:49:39 字数 626 浏览 0 评论 0原文

我想将这样的代码中的属性查找概括

.ForMember(dest => dest.FirstName, opt => opt.MapFrom(src => src.GetValue("FirstName"))
.ForMember(dest => dest.LastName, opt => opt.MapFrom(src => src.GetValue("LastName"))
... (repeated for many properties)

为单行代码，从概念上讲是这样的：

// How can I access the property name?
.ForAllMembers(opt => opt.MapFrom(src => src.GetValue([[PROPERTYNAME]]))

“源”值几乎总是对 GetValue() 方法进行基于字符串的查找，使用来自的属性名称目的地。我只是不知道如何在“目标”lambda 中定义属性时从“源”lambda 访问该属性的字符串名称。似乎应该有一种方法可以做到这一点，但我没有运气找到相关的例子。

我希望这是有道理的。预先感谢您的任何见解，

杰夫

原文

I'd like to generalize a property lookup from code like this

.ForMember(dest => dest.FirstName, opt => opt.MapFrom(src => src.GetValue("FirstName"))
.ForMember(dest => dest.LastName, opt => opt.MapFrom(src => src.GetValue("LastName"))
... (repeated for many properties)

to a one-liner, conceptually something like this:

// How can I access the property name?
.ForAllMembers(opt => opt.MapFrom(src => src.GetValue([[PROPERTYNAME]]))

The "source" value is almost always be a string-based lookup into a GetValue() method, using the property name from the destination. I just don't know how to access the string name of the property from the "source" lambda when it's defined in the "destination" lambda. It seems like there ought to be a way to do this but I'm not having luck finding a relevant example.

I hope this makes sense. Thanks in advance for any insights,

Jeff

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甜扑 2024-09-20 02:49:39

您应该能够使用自定义解析器，它使用反射来获取所有属性名称，然后调用源对象的 GetValue() 方法。

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人│生佛魔见 2024-09-20 02:49:39

我知道这个问题已经有 2-3 年了，但我遇到了这样的问题，很难找到答案，主要是因为文档中没有记录 IValueResolver 接口。

我最终做了这样的事情：

public class UserProfileMapping : Profile
{
    protected override void Configure()
    {
        Mapper.CreateMap<ProfileBase, UserProfileModel>()
              .ForAllMembers(m => m.ResolveUsing<ProfileValueResolver>());
    }

    public class ProfileValueResolver : IValueResolver
    {
        public ResolutionResult Resolve(ResolutionResult source)
        {
            return source.New(
                ((ProfileBase)source.Value)
                .GetPropertyValue(source.Context.MemberName)
            );
        }
    }
}

希望这对某人有帮助。

I know this question is like 2-3 years old, but I ran into something like this and it was very hard to find the answer, mostly because IValueResolver interface is not documented in the documentation.

I ended up doing something like this:

public class UserProfileMapping : Profile
{
    protected override void Configure()
    {
        Mapper.CreateMap<ProfileBase, UserProfileModel>()
              .ForAllMembers(m => m.ResolveUsing<ProfileValueResolver>());
    }

    public class ProfileValueResolver : IValueResolver
    {
        public ResolutionResult Resolve(ResolutionResult source)
        {
            return source.New(
                ((ProfileBase)source.Value)
                .GetPropertyValue(source.Context.MemberName)
            );
        }
    }
}

Hope this helps someone.

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