如何在Net Core中重构一个AutoMapper函数

Question

我正在解决软件开发人员入学考试，我必须开发一个学生注册课程应用程序，并且在其中一个阶段需要编写一个映射器函数，将模型与他的 ModelDto 映射。我这样做了，但现在我必须按照 Omnio（干净架构）方法论软件开发的顺序进行重构。

这是主题模型：

  public class Subject
    {
        public int? SubjectId {get; set; }
        public string? Title {get; set; }
        public int? Credits {get; set; }
        public string registerAt? {get; set;}
   }

公共课SubjectDto

 public string? Title {get; set; }
 public int? Credits {get; set; }
 public string registerAt? {get; set;}

现在这是我确定的 Mapper 配置：

public class MapperConfig:Profile
        {
            public static MapperConfiguration InitializeAutoMapper()
            {
                //Provide all the Mapping Configuration
                var config = new MapperConfiguration(cfg =>
                {
                    //Configuring Subject and EmployeeDTO
                    cfg.CreateMap<Subject, SubjectDto>()
                    //Provide Mapping Configuration of FullName and Name Property
                    .ForMember(dest => dest.Title, act => act.MapFrom(src => src.Title))
                    
                    //Provide Mapping Dept of FullName and Department Property
                    .ForMember(dest => dest.Credits, act => act.MapFrom(src => src.Credits));
                    //Any Other Mapping Configuration ....
                });
                return config;
            }
        }

这就是我在控制器中使用它的方式：

   public async Task<IEnumerable<SubjectDto>> GetAllAsync(int id, CancellationToken cancellationToken = default)
        {
          var subjects = await _context.Subject.GetSubjectsAsync(id, cancellationToken);
          
          if (subjects is null)
          {
             throw new SubjectNotFoundException(id);
          }

          var mapper = MapperConfig.InitializeAutoMapper();

          var subjectDto = mapper.Map<SubjectDto>(subjects); #cause the error CS1061     
        }

它告诉我 MapperConfig 没有可扩展的 Map 方法。

如果有人可以帮助正确重构Mapper函数，我将非常感激。

Answer 1

调整你的配置类：

public class MapperConfig
{
    public static Mapper InitializeAutoMapper()
    {
        //Provide all the Mapping Configuration
        var config = new MapperConfiguration(cfg =>
        {
            //Configuring Subject and EmployeeDTO
            cfg.CreateMap<Subject, SubjectDto>()
            //Provide Mapping Configuration of FullName and Name Property
            .ForMember(dest => dest.Title, act => act.MapFrom(src => src.Title))

            //Provide Mapping Dept of FullName and Department Property
            .ForMember(dest => dest.Credits, act => act.MapFrom(src => src.Credits));
            //Any Other Mapping Configuration ....
        });

        var mapper = new Mapper(config);

        return mapper;
    }
}

不要忘记纠正你的模型：

public string registerAt? {get; set;}

到

public string? registerAt {get; set;}

最后，根据您的情况，为您要返回的列表制作地图：

 var subjects = mapper.Map<IEnumerable<SubjectDto>>(subjects)
 retunr subjects ;

希望对您有帮助