AutoMapper，远离过时的静态 API

Question

我正在使用现有的解决方案。该解决方案使用 Windsor IoC。我有一个 AutomapperMappings.cs class 看起来像这样：

public class AutoMapperMappings
{
    public static void Configure()
    {
        AutoMapper.Mapper.Configuration
        .CreateMap<LatestUpdateModel, LatestUpdate>();

        AutoMapper.Mapper.Configuration
        .CreateMap<LatestUpdate, LatestUpdateModel>();

        AutoMapper.Mapper.Configuration
        .CreateMap<DownloadLinkModel, DownloadLink>();

        AutoMapper.Mapper.Configuration
        .CreateMap<DownloadLink, DownloadLinkModel>();

        AutoMapper.Mapper.Configuration
        .CreateMap<NavigationElementModel, NavigationElement>();

        AutoMapper.Mapper.Configuration
        .CreateMap<NavigationElement, NavigationElementModel>();

        AutoMapper.Mapper.Configuration
        .CreateMap<Promobox, PromoboxModel>();

        AutoMapper.Mapper.Configuration
        .CreateMap<PromoboxModel, Promobox>();
    }
}

在我的 Global.asax 中，我有以下内容：

protected void Application_Start(object sender, EventArgs e)
{
    IoCContainer();
    ConfigureAutoMapperMappings();
}

protected virtual void ConfigureAutoMapperMappings()
{
    AutoMapperMappings.Configure();
}

以上是警告我应该远离静态API。所以我四处搜索并做了一些阅读，建议我将 AutomapperMappings.cs 更改为：

public class AutoMapperMappings
{
    public static void Configure()
    {
        var config = new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<LatestUpdateModel, LatestUpdate>();
            cfg.CreateMap<LatestUpdate, LatestUpdateModel>();
            cfg.CreateMap<DownloadLinkModel, DownloadLink>();
            cfg.CreateMap<DownloadLink, DownloadLinkModel>();
            cfg.CreateMap<NavigationElementModel, NavigationElement>();
            cfg.CreateMap<NavigationElement, NavigationElementModel>();
            cfg.CreateMap<Promobox, PromoboxModel>();
            cfg.CreateMap<PromoboxModel, Promobox>();
        });
    }
}

一切都很好，但是变量 var config 实际上并没有在任何地方使用，所以我确定我需要做更多的事情，但我不知道我需要改变什么

Answer 1

我会在这里查看 Jimmy Bogards（Automapper 创建者）post：

https://lostechies.com/jimmybogard/2016/01/21/removing-the-static-api-from-automapper/

IMapper mapper = config.CreateMapper();

配置可用于 return IMappper 接口，可以更轻松地用于测试目的、创建新映射等。

Answer 2

有教程"Migrating from static API"。

您需要创建 mapper 对象并将其注册到 IoC 容器：

public class AutoMapperMappings
{
    public static void Configure(IWindsorContainer container)
    {
        var config = new MapperConfiguration(cfg =>
        {
            cfg.CreateMap<LatestUpdateModel, LatestUpdate>();
            ...
        });

        var mapper = config.CreateMapper();

        // register your mapper here.
        container.Register(Component.For<IMapper>().Instance(mapper));
    }
}

现在您可以将映射器注入需要映射实体的类：

public class ExampleClass 
{
    private readonly IMapper _mapper;
    public ExampleClass(IMapper mapper)
    {
        _mapper = mapper;
    }

    public void DoWork()
    {
        var model = new LatestUpdateModel();
        ...
        var update = mapper.Map<LatestUpdateModel, LatestUpdate>(model);
    }
}

此迁移将通过为 IMapper 接口创建模拟对象来帮助您使代码更易于测试。

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c#

automapper