使用 Automapper 映射复杂的继承模型

Question

我正在开发我的 .NET Core 3.0 应用程序，我需要使用 Automapper 将我的模型映射到另一个模型（我有 ddl-s 并且需要使用这些库）。

我的模型（源模型）具有以下结构：

public class ProfessorModel {
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Email { get; set; }
    public string Profession { get; set; }
    public string JobId { get; set; }
}

public class UniversityMembersModel {
    public IEnumerable<ProfessorModel> People { get; set; }
}

目标模型如下：

public interface Identificator {
    int Id { get; }
}

public interface IPerson : Identificator {
    string FirstName { get; }
    string LastName { get; }
}

public abstract class TeachingStaff : IPerson, Identificator {
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Email { get; set; }
}

public class TeachingProfessor : TeachingStaff {
    public string Profession { get; set; }
    public string TeachingSubject { get; set; }
    public string JoblId { get; set; }
}

public class UniversityMembers {
    public IEnumerable<IPerson> People { get; set; }
}

我无法正确映射到目标模型。我尝试使用以下 Automapper 配置：

var config = new MapperConfiguration(cfg => {
    cfg.CreateMap<ProfessorModel, IPerson>(); // <-- does not work

    // does not work:
    cfg.CreateMap<ProfessorModel, IPerson>()
        .ConstructUsing(p => new TeachingProfessor());

    // does not work:
    cfg.CreateMap<ProfessorModel, TeachingProfessor>();

    // does not work:
    cfg.CreateMap<ProfessorModel, TeachingProfessor>()
        .ConstructUsing(p => new TeachingProfessor());
});

我需要从源映射到目标模型的响应如下：

{
    "people": [
        {
            "id": 213,
            "firstName": "John",
            "lastName": "Doe",
            "email": "johny@myUni.edu",
            "profession": "Full time professor Biology",
            "jobId": "J3487H"
        },
        {
            "id:" 928,
            "firstName": "Mary",
            "lastName": "Doe",
            "email": "mary.me@my.uni",
            "profession": "Part time professor Chemistry",
            "jobId": "P3436JJ"
        }
    ]
}

如何从源模型中获取映射的目标模型？我无法更改目标模型的结构，因为它是在现有 .dll 库中定义的。我也没有在文档中找到有关继承抽象类和接口的任何解决方案。

谢谢大家！

Answer 1

我查看了一些 Whosebug 的答案并最终得出了以下可行的解决方案。

我已经创建了自定义转换器：

public class ProfessorIPersonConverter : ITypeConverter<src.Professor, dest.IPerson>
    {
        public IPerson Convert(Professor source, IPerson destination, ResolutionContext context)
        {
            return context.Mapper.Map<src.Professor, dest.TeachingProfessor>(source);
        }
    }

然后包含在现有映射器配置中：

var config = new MapperConfiguration(cfg => {
    cfg.CreateMap<src.Professor, dest.IPerson>()
       .ConvertUsing(new ProfessorIPersonConverter());
    cfg.CreateMap<src.Professor, dest.TeachingProfessor>();
});

它就像一个魅力:)

使用 Automapper 映射复杂的继承模型

Mapping complex inherited models with Automapper

c#

automapper

.net-core