从Automapper 2.2.1迁移到Automapper 4.2.1

Question

我有一个项目，我一直在使用Automapper2.2.1。我升级到4.2.1，完全崩溃了。我试图遵循这，将对Mapper.CreateMap<Source, Target>()的所有引用都更改为Mapper.Initialize(cfg => { cfg.CreateMap<Source, Target>()})。我现在坏了，我似乎无法完成它，我得到的"System.Reflection.ReflectionTypeLoadException被用户代码异常处理，无法加载一个或多个所请求的类型。检索LoaderExceptions属性以获得更多信息“消息。我错过了什么。代码如下：

AutomapperTypeAdapterFactory

public class AutomapperTypeAdapterFactory : ITypeAdapterFactory
{
    public AutomapperTypeAdapterFactory()
    {
        //scan all assemblies finding Automapper Profile
        var profiles = AppDomain.CurrentDomain
                                .GetAssemblies()
                                .SelectMany(a => a.GetTypes())
                                .Where(t => t.BaseType == typeof(Profile));

        Mapper.Initialize(cfg =>
        {
            foreach (var item in profiles)
            {
                if (item.FullName != "AutoMapper.SelfProfiler`2")
                    cfg.AddProfile(Activator.CreateInstance(item) as Profile);
            }
        });
    }

    public ITypeAdapter Create() => new AutomapperTypeAdapter();
}

部门概况

public class DepartmentProfile : Profile
{
    protected override void Configure()
    {
        Mapper.Initialize(cfg =>
        {
            cfg.CreateMap<Department, DepartmentDto>();
        });
    }
}

UnityContainer

public static class Container
{
    static IUnityContainer _container = new UnityContainer();

    static Container()
    {
        var typeAdapterFactory = _container.Resolve<ITypeAdapterFactory>();
        TypeAdapterFactory.SetCurrent(typeAdapterFactory);
    }
    //other container resolutions....
}

Answer 1

在脱离静态配置的项目中，我定义了几个映射配置文件(通常每个应用程序层都有一个概要文件)：

public class MappingProfile : Profile
{
    protected override void Configure()
    {
        CreateMap<Source, Destination>();
    }
}

然后我配置我的IoC (在我的例子中是SimpleInjector)，以查找所有的配置文件，并将它们添加到一个单一的统一配置中。然后，我在容器中注册MapperConfiguration，以及从该容器中创建的IMapper对象：

    public void ConfigureSimpleInjector(IAppBuilder app)
    {
        var container = new Container();
        container.Options.DefaultScopedLifestyle = new WebRequestLifestyle();

        container.RegisterAutoMapper();

        container.RegisterMvcControllers(Assembly.GetExecutingAssembly());

        container.RegisterMvcIntegratedFilterProvider();

        container.Verify();

        DependencyResolver.SetResolver(new SimpleInjectorDependencyResolver(container));
    }


public static Container RegisterAutoMapper(this Container container)
    {
        var profiles = typeof(AutoMapperRegistry).Assembly.GetTypes().Where(t => typeof(Profile).IsAssignableFrom(t)).Select(t => (Profile)Activator.CreateInstance(t));

        var config = new MapperConfiguration(cfg =>
        {
            foreach (var profile in profiles)
            {
                cfg.AddProfile(profile);
            }
        });

        container.Register<MapperConfiguration>(() => config);
        container.Register<IMapper>(() => container.GetInstance<MapperConfiguration>().CreateMapper());

        return container;
    }
}

然后，我可以将DI用于IMapper (或者您可以静态地存储它)，以及用于LINQ投影的MapperConfiguration。