无法将 Auto Mapper 与 .net core 2.2 一起使用

Unable to use Auto Mapper with .net core 2.2

我无法在 .net core 2.2 中使用 Auto Mapper。它一直抛出这个错误:

Unmapped members were found. Review the types and members below. Add a custom mapping expression, ignore, add a custom resolver, or modify the source/destination type For no matching constructor, add a no-arg ctor, add optional arguments, or map all of the constructor parameters ======================================================================================================================================================================================================= AutoMapper created this type map for you, but your types cannot be mapped using the current configuration. IDataReader -> List1 (Destination member list) System.Data.IDataReader -> System.Collections.Generic.List1[[Models.EngineModel, Models, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]] (Destination member list)

Unmapped properties: Capacity

这是我的引擎模型 class:

public class EngineModel
{
        public string Id { get; set; }

        public int engineNo { get; set; }

        public string engineHost { get; set; }
}

这是我的个人资料:

    public class EngineMappingProfile : Profile
    {
        public EngineMappingProfile()
        {

            CreateMap<IDataReader, EngineModel>()
               .ForMember(dest => dest.Id , opt => opt.MapFrom(src => src.GetString(src.GetOrdinal("ID"))))
               .ForMember(dest => dest.engineNo , opt => opt.MapFrom(src => src.GetInt32(src.GetOrdinal("ENG_NO"))))
               .ForMember(dest => dest.engineHost , opt => opt.MapFrom(src => src.GetString(src.GetOrdinal("ENG_HOST"))))

        }
    }

这是我的 Startup.cs ConfigureServices 方法:


       public void ConfigureServices(IServiceCollection services)
        {

            Mapper.Initialize(cfg =>
            {
                cfg.AddProfile<EngineMappingProfile>();
            });
            services.AddAutoMapper();

            services.AddMvc()
                .SetCompatibilityVersion(CompatibilityVersion.Version_2_2)
                .AddJsonOptions(options =>
                {
                    options.SerializerSettings.NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore;
                });
        }

以上所有代码都在我的 API 项目中。我在我的商业项目中使用这些配置文件:


 var enginesData = AutoMapper.Mapper.Map<IDataReader, List<EngineModel>>(dataReader.mcDataReader);

我正在使用 "AutoMapper.Extensions.Microsoft.DependencyInjection (6.0.0)" 和“AutoMapper (8.0.0)

AutoMapper 正在抱怨,因为 IDataReader 有您未指定的其他属性。您要么需要将它们全部映射(在本例中显然不需要),要么指定应忽略它们,例如:

        CreateMap<IDataReader, EngineModel>()
           .ForMember(...)
           .ForMember(...)
           .ForMember(...)
           .ForAllOtherMembers(x => x.Ignore()); // < -- Add this line

我使用的是与您相同的版本,所以这就是我配置自动映射器的方式

在我的startup.cs中我只需要这个

services.AddAutoMapper(config => config.ValidateInlineMaps = false);

以及我如何创建个人资料class

public class CommentProfile : Profile
{
    public CommentProfile()
    {
        CreateMap<Comment, CommentDto>(MemberList.None).ReverseMap();
    }
}

public class Comment : BaseEntity
{
    public string Content { get; set; }
    public virtual Comment ParentComment { get; set; }
    public virtual Post Post { get; set; }
    public virtual User? User { get; set; }
    public CommentStatus CommentStatus { get; set; }
}

public class CommentDto
{
    public int Id { get; set; }
    public Guid UniqeId { get; set; }
    public string Content { get; set; }
    public Comment ParentComment { get; set; }
    public CommentStatus CommentStatus { get; set; }
    public DateTime DateCreated { get; set; }
}

您只需要:

services.AddAutoMapper();

在服务集合中注册 IMapper 并自动应用命名空间中的所有配置文件(从 Profile 继承的任何 class)。

那么,你应该注入 IMapper,而不是使用静态 Mapper。在您的控制器中:

public class MyController : Controller
{
    private readonly IMapper _mapper;

    public MyController(IMapper mapper)
    {
        _mapper = mapper;
    }

然后,当你想映射一些东西时:

 var enginesData = _mapper.Map<List<EngineModel>>(dataReader.mcDataReader);

但是,您不能直接将 IDataReader 实例映射到列表,这是您的主要问题。您需要枚举数据 reader 将行存储为列表中的项目,然后您可以从该列表映射到您的 List<EngineModel>。不过,在这一点上,将行读出为 EngineModel 并在枚举数据 reader 时构建列表可能更有意义。那就根本不用贴图了

您只需要从 NuGet 包安装 AutoMapper.Data(您的情况是 3.0.0),然后在启动时添加以下代码:

services.AddAutoMapper(cfg =>
{
    cfg.AddDataReaderMapping();
});

参考

https://github.com/AutoMapper/AutoMapper.Extensions.Microsoft.DependencyInjection/issues/50