在哪里定义AutoMapper映射？

Question

在我的ASP.NET MVC应用程序中,我应该定义AutoMapper映射吗？

Mapper.CreateMap<User, UserViewModel>();

目前我在BaseController的构造函数中定义了这些,我的所有Controlllers都是从这个构造函数派生出来的.这是最好的地方吗？

Answer 1

我认为回答这个问题有点迟,但也许有人可以使用我的答案.

我使用Ninject来解析依赖关系,所以我为AutoMapper创建了Ninject模块.这是代码:

public class AutoMapperModule : NinjectModule
{
    public override void Load()
    {
        Bind<IConfiguration>().ToMethod(context => Mapper.Configuration);
        Bind<IMappingEngine>().ToMethod(context => Mapper.Engine);

        SetupMappings(Kernel.Get<IConfiguration>());

        Mapper.AssertConfigurationIsValid();
    }

    private static void SetupMappings(IConfiguration configuration)
    {
        IEnumerable<IViewModelMapping> mappings = typeof(IViewModelMapping).Assembly
            .GetExportedTypes()
            .Where(x => !x.IsAbstract &&
                        typeof(IViewModelMapping).IsAssignableFrom(x))
            .Select(Activator.CreateInstance)
            .Cast<IViewModelMapping>();

        foreach (IViewModelMapping mapping in mappings)
            mapping.Create(configuration);
    }
}

正如您在加载时看到的那样,它扫描程序集以实现IViewModelMapping,然后运行Create方法.

这是IViewModelMapping的代码:

interface IViewModelMapping
{
    void Create(IConfiguration configuration);
}

IViewModelMapping的典型实现如下所示:

public class RestaurantMap : IViewModelMapping
{
    public void Create(IConfiguration configuration)
    {
        if (configuration == null)
            throw new ArgumentNullException("configuration");

        IMappingExpression<RestaurantViewModel, Restaurant> map =
            configuration.CreateMap<RestaurantViewModel, Restaurant>();
// some code to set up proper mapping

        map.ForMember(x => x.Categories, o => o.Ignore());
    }
}