使用ProjectTo（）

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未初始化。使用适当的配置调用Initialize。如果您尝试通过容器或其他方式使用映射器实例，请确保您没有对静态Mapper.Map方法的任何调用，并且如果您使用的是ProjectTo或UseAsDataSource扩展方法，请确保传入适当的IConfigurationProvider实例

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;
    }

自动播放器配置文件

   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));

    }

}

我也使用StructureMap来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和Issue但未解决我的问题。

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;
}