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我有一個3層架構Web Api解決方案,里面有3個項目：數(shù)據(jù),業(yè)務和表示層.我需要在兩個業(yè)務和表示層中初始化兩個不同的映射器.

我已經創(chuàng)建了一個靜態(tài)類和方法來初始化業(yè)務邏輯中的一個映射器：

using AutoMapper;using Shop.BLL.DTOModels;using Shop.DAL.Models;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Shop.BLL.InitMapper{    public static class InitializeMapperBLL    {        public static void RegisterMappings()        {            Mapper.Initialize(cfg => cfg.CreateMap<Category, DTOCategoryModel>());        }    }}

并稱之為：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using Shop.DAL.Repositories;using AutoMapper;using Shop.BLL.DTOModels;using Shop.DAL.Models;using Shop.BLL.Interfaces;using Shop.DAL.Interfaces;using Shop.BLL.InitMapper;namespace Shop.BLL.Services{    public class CategoryService : ICategoryService    {        IUnitOfWork Database { get; set; }        public CategoryService(IUnitOfWork uow)        {            Database = uow;        }        public IEnumerable<DTOCategoryModel> GetCategories()        {//I call it here            InitializeMapperBLL.RegisterMappings();            return Mapper.Map<IEnumerable<Category>, List<DTOCategoryModel>>(Database.Categories.GetAll());        }        public void Dispose()        {            Database.Dispose();        }    }}

在表示層我做同樣的事情：

using AutoMapper;using Shop.API.ViewModels;using Shop.BLL.DTOModels;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Shop.API.MapperInit{    public static class InitializeMapperAPI    {        public static void RegisterMappings()        {            Mapper.Initialize(cfg => cfg.CreateMap<DTOCategoryModel, CategoryViewModel>());        }    }}

并調用Global.asax

protected void Application_Start()        {            AreaRegistration.RegisterAllAreas();            GlobalConfiguration.Configure(WebApiConfig.Register);            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);            RouteConfig.RegisterRoutes(RouteTable.Routes);            BundleConfig.RegisterBundles(BundleTable.Bundles);      //here I call it            InitializeMapperAPI.RegisterMappings();            CreateKernel();        }

我已經初始化了錯誤Mapper.您必須為每個應用程序域/進程調用一次Initialize.

如何解決這個問題呢？

解決方法:

您可以使用反射和自動播放器配置文件的一種方法.這在我用過的項目中非常有效.

在每個項目/圖層中創(chuàng)建一個automapper配置文件類.每個配置文件類應僅包含它自己需要的映射.以下是其中一個的示例：

  //Profile here is of type AutoMapper.Profile  public class BusinessLayerMapperConfig : Profile  {    public BusinessLayerMapperConfig()    {      //create layer specific maps      CreateMap<MyObjectDTO, MyObjectViewModel>();    }    public override string ProfileName    {      get { return this.GetType().ToString(); }    }  }

然后真正靠近應用程序入口點的地方(我從Global.asax.cs中的ApplicationStart方法調用以下方法),初始化所有的配置文件,如下所示：

public static void RegisterMaps()    {      //get all projects' AutoMapper profiles using reflection      var assembliesToScan = System.AppDomain.CurrentDomain.GetAssemblies();      var allTypes = assembliesToScan.SelectMany(a => a.ExportedTypes).ToArray();      var profiles =          allTypes              .Where(t => typeof(Profile).GetTypeInfo().IsAssignableFrom(t.GetTypeInfo()))              .Where(t => !t.GetTypeInfo().IsAbstract);      //add each profile to our static AutoMapper      Mapper.Initialize(cfg =>      {        foreach (var profile in profiles)        {          cfg.AddProfile(profile);        }      });    }

這將允許您按照它們使用的圖層邏輯分隔您的地圖,并確保您只初始化它們一次.