映射器未初始化，使用 ProjectTo() 时

Question

我在我的项目中使用 Automapper 5.2.0。当我在代码中使用 ProjectTo() 时出现此错误：

Mapper not initialized. Call Initialize with Appropriate configuration. If you are trying to use mapper instances through a container or otherwise, make sure you do not have any calls to the static Mapper.Map methods, and if you're using ProjectTo or UseAsDataSource extension methods, make sure you pass in the appropriate IConfigurationProvider instance.

服务代码

 public async Task<FreelancerProfileViewModel> GetFreelancerProfile()
    {
        var id = Guid.Parse(_identity.GetUserId());
        var model = await _freelancerProfiles
            .AsNoTracking()
            .Where(_ => _.User.Id == id)
            .ProjectTo<FreelancerProfileViewModel>()
            .FirstAsync();

     //  var viewmodel =  _mapper.Map<FreelancerProfileViewModel>(model);

        return model;
    }

Automapper 配置文件

   public class FreelancerDashbordProfile : Profile
{
    private readonly IIdentity _identity;
    public FreelancerDashbordProfile(IIdentity identity)
    {
        _identity = identity;
        var id = Guid.Parse(_identity.GetUserId());
        CreateMap<FreelancerProfile, FreelancerProfileViewModel>()
        .ForMember(_ => _.DoingProjectCount,
            __ => __.MapFrom(_ => _.Projects.Count(project => project.ProjectState == ProjectState.Doing)))

        .ForMember(_ => _.EndProjectCount,
            __ => __.MapFrom(_ => _.Projects.Count(project => project.ProjectState == ProjectState.End)))

        .ForMember(_ => _.ProjectCount, __ => __.MapFrom(_ => _.Projects.Count));

    }

}

我也用 StructureMap For IoC

AutoMapperRegistery

   public AutoMapperRegistery()
    {

        this.Scan(scan =>
        {
            scan.TheCallingAssembly();
            scan.AssemblyContainingType<SkillProfile>(); // for other asms, if any.
            scan.WithDefaultConventions();

            scan.AddAllTypesOf<Profile>().NameBy(item => item.FullName);
        });

        this.For<MapperConfiguration>().Singleton().Use("MapperConfig", ctx =>
        {
            var config = new MapperConfiguration(cfg =>
            {
                cfg.CreateMissingTypeMaps = true; // It will connect `Person` & `PersonViewModel` automatically.
                addAllCustomAutoMapperProfiles(ctx, cfg);
            });
            config.AssertConfigurationIsValid();

            return config;
        });

        this.For<IMapper>()
            .Singleton()
            .Use(ctx => ctx.GetInstance<MapperConfiguration>().CreateMapper(ctx.GetInstance));


    }

我看到其他 Question and Issue 但没有解决我的问题。

Answer 1

您需要将 MappingConfiguration 提供程序传递给 ProjectTo 调用。

public async Task<FreelancerProfileViewModel> GetFreelancerProfile()
{
    var id = Guid.Parse(_identity.GetUserId());
    var model = await _freelancerProfiles
        .AsNoTracking()
        .Where(_ => _.User.Id == id)
        .ProjectTo<FreelancerProfileViewModel>(_mapper.Configuration)
        .FirstAsync();

 //  var viewmodel =  _mapper.Map<FreelancerProfileViewModel>(model);

    return model;
}

Answer 2

在.NET Core 3.1 (AutoMapper 9.0.0) 中新注册的是： services.AddAutoMapper(typeof(Startup));

在 .NET Core 2.1 (AutoMapper 7.0.1) 版本中你必须通过 ConfigurationProvider.

按照说明注册 AutoMapper here
注入控制器：

私有只读IMapper _mapper； public SomeController(ApplicationDbContext dbContext, IMapper 映射器) { _mapper = 映射器； }
这样传递 ConfigurationProvider：

ApplicationDbContext.SomeEntities.ProjectTo(_mapper.ConfigurationProvider)

映射器未初始化，使用 ProjectTo() 时

Mapper not initialized, When Use ProjectTo()

c#

structuremap

ioc-container

automapper-5