Automapper说Mapper.Map是过时的全局映射? [英] Automapper says Mapper.Map is obsolete, global mappings?

问题描述

我在项目中定义了一个全局Automapper配置，该配置使我可以在代码中使用Mapper.Map<targetType>(sourceObject);. (请参见下面的配置.)

I had defined in my project a global Automapper configuration that would allow me to use Mapper.Map<targetType>(sourceObject); in my code. (See my configuration below.)

我更新了NuGet程序包，并且看到消息Mapper.Map已过时/已弃用.我回到了GitHub上的Automapper，然后看到了这样的示例:

I updated the NuGet package, and I see the message that Mapper.Map is obsolete/depreciated. I went back to Automapper on GitHub and see examples like this:

[Test]
public void Example()
{
    var config = new MapperConfiguration(cfg =>
    {
        cfg.CreateMap<Source1, SubDest1>().FixRootDest();
        cfg.CreateMap<Source2, SubDest2>().FixRootDest();
    });

    config.AssertConfigurationIsValid();

    var mapper = config.CreateMapper();

    var subDest1 = mapper.Map<Source1, SubDest1>(new Source1 {SomeValue = "Value1"});
    var subDest2 = mapper.Map<Source2, SubDest2>(new Source2 {SomeOtherValue = "Value2"});

    subDest1.SomeValue.ShouldEqual("Value1");
    subDest2.SomeOtherValue.ShouldEqual("Value2");
}

我是否必须在使用映射的每种方法中创建一个配置?

Am I going to have to create a configuration in EVERY method that uses a mapping?

我当前的全局配置:

namespace PublicationSystem.App_Start
{
    public class AutoMapperConfig
    {
        public static void CreateMaps()
        {
            CreateProjectMaps();
        }

        private static void CreateProjectMaps()
        {
            Mapper.CreateMap<Project, ProjectCreate>();
            Mapper.CreateMap<Project, ProjectSelectable>();
            //...
        }
    }
}

更新: :由于斯科特·张伯伦(Scott Chamberlain)的一些指导，我创建了一个像这样的课程:

UPDATE: Thanks to some coaching from Scott Chamberlain I have created a class like this:

    public class MkpMapperProfile : AutoMapper.Profile
    {
        protected override void Configure() 
        {
            this.CreateMap<Project, ProjectCreate>();

            this.CreateMap<Project, ProjectSelectable>();

            this.CreateMap<Project, ProjectDetails>();

            // Many Many other maps
        }
    }

我在想我的BaseController类中应该有"MapperConfiguration".我开始做这样的事情:

I'm thinking I should have the 'MapperConfiguration' in my BaseController class. I started to do something like this:

public partial class BaseController : Controller
{

    private MapperConfiguration mapConfig;

    public BaseController()
    {
        db = new MkpContext();
        SetMapperConfig();
    }

    private void SetMapperConfig()
    {
        mapConfig = new MapperConfiguration(cfg =>
            {
                cfg.AddProfile<MkpMapperProfile>();
            });
    }

    public BaseController(MapperConfiguration config)
    {
        db = new MkpContext();
        this.mapConfig = config;
    }
}

我在正确的轨道上吗?

推荐答案

这就是我的处理方式.

在配置文件中创建地图，请谨慎使用配置文件的CreateMap方法，而不要使用Mapper的同名静态方法:

Create maps in a Profile, taking care to use the Profile's CreateMap method rather than Mapper's static method of the same name:

internal class MappingProfile : Profile
{
    protected override void Configure()
    {
        CreateMap<Project, ProjectCreate>();
    }
}

然后，无论连接了哪些依赖项(例如Global.asax或Startup)，请创建一个MapperConfiguration，然后使用它来创建IMapper.

Then, wherever dependencies are wired-up (ex: Global.asax or Startup), create a MapperConfiguration and then use it to create an IMapper.

var mapperConfiguration = new MapperConfiguration(cfg =>
    {
        cfg.AddProfile(new MappingProfile());
    });

然后，使用配置生成IMapper:

Then, use the configuration to generate an IMapper:

var mapper = mapperConfiguration.CreateMapper();

然后，向依赖项生成器注册该映射器(我在这里使用Autofac)

Then, register that mapper with the dependency builder (I'm using Autofac here)

builder.RegisterInstance(mapper).As<IMapper>();

现在，无论您需要在哪里映射东西，都声明对IMapper的依赖:

Now, wherever you need to map stuff, declare a dependency on IMapper:

internal class ProjectService : IProjectService {
    private readonly IMapper _mapper;
    public ProjectService(IMapper mapper) {
         _mapper = mapper;
    }
    public ProjectCreate Get(string key) {
        var project = GetProjectSomehow(key);
        return _mapper.Map<Project, ProjectCreate>(project);
    }
}

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