Fehler beim Aktivieren von IConfigurationProvider bei Verwendung von AutoMapper

Question

Ich entwickle eine .NET MVC 5-Anwendung mit Entity Framework 6. Ich habe bereits meine Datenbank erstellt. Dann habe ich ein einfaches ViewModel und verwenden Sie es in der HomeController.But, wenn ich versuche zu mappen das Ansichtsmodell mit dem Datenbank-Modell in der Steuerung erhalte ich diese Fehler:

Error activating IConfigurationProvider No matching bindings are available, and the type is not self-bindable. Activation path: 3) Injection of dependency IConfigurationProvider into parameter configurationProvider of constructor of type Mapper 2) Injection of dependency IMapper into parameter mapper of constructor of type HomeController 1) Request for HomeController

Suggestions: 1) Ensure that you have defined a binding for IConfigurationProvider. 2) If the binding was defined in a module, ensure that the module has been loaded into the kernel. 3) Ensure you have not accidentally created more than one kernel. 4) If you are using constructor arguments, ensure that the parameter name matches the constructors parameter name. 5) If you are using automatic module loading, ensure the search path and filters are correct.

das ist mein Homecontroller ist:

public ActionResult Index() 
    { 
     var ads = this.adService 
      .GetAll() 
      .ToList() 
      .Select(x => this.mapper.Map<AdViewModel>(x)); 


     var viewModel = new MainViewModel() 
     { 
      Ads = ads, 
     }; 

     return View(viewModel); 

     //return View(); 
    } 

das ist meine AutoMapperConfiguration ist:

public class AutoMapperConfig 
{ 
    public static IMapperConfigurationExpression Configuration { get; private set; } 

    public void Execute(Assembly assembly) 
    { 
     Mapper.Initialize(
      cfg => 
      { 
       var types = assembly.GetExportedTypes(); 
       LoadStandardMappings(types, cfg); 
       LoadCustomMappings(types, cfg); 
       Configuration = cfg; 
      }); 
    } 

    private static void LoadStandardMappings(IEnumerable<Type> types, IMapperConfigurationExpression mapperConfiguration) 
    { 
     var maps = (from t in types 
        from i in t.GetInterfaces() 
        where i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IMapFrom<>) && 
          !t.IsAbstract && 
          !t.IsInterface 
        select new 
        { 
         Source = i.GetGenericArguments()[0], 
         Destination = t 
        }).ToArray(); 

     foreach (var map in maps) 
     { 
      mapperConfiguration.CreateMap(map.Source, map.Destination); 
      mapperConfiguration.CreateMap(map.Destination, map.Source); 
     } 
    } 

    private static void LoadCustomMappings(IEnumerable<Type> types, IMapperConfigurationExpression mapperConfiguration) 
    { 
     var maps = (from t in types 
        from i in t.GetInterfaces() 
        where typeof(IHaveCustomMappings).IsAssignableFrom(t) && 
          !t.IsAbstract && 
          !t.IsInterface 
        select (IHaveCustomMappings)Activator.CreateInstance(t)).ToArray(); 

     foreach (var map in maps) 
     { 
      map.CreateMappings(mapperConfiguration); 
     } 
    } 
} 

}

Die NinjectConfig:

private static void RegisterServices(IKernel kernel) 
    { 
     kernel.Bind(x => 
     { 
      x.FromThisAssembly() 
      .SelectAllClasses() 
      .BindDefaultInterface(); 
     }); 

     kernel.Bind(x => 
     { 
      x.FromAssemblyContaining(typeof(IService)) 
      .SelectAllClasses() 
      .BindDefaultInterface(); 
     }); 

     kernel.Bind(typeof(IEfRepository<>)).To(typeof(EfRepository<>)); 
     kernel.Bind(typeof(DbContext), typeof(MsSqlDbContext)).To<MsSqlDbContext>().InRequestScope(); 
     kernel.Bind<ISaveContext>().To<SaveContext>(); 
     kernel.Bind<IMapper>().To<Mapper>(); 

    } 

Und der Global.asax:

protected void Application_Start() 
    { 
     Database.SetInitializer(new MigrateDatabaseToLatestVersion<MsSqlDbContext, Configuration>()); 

     AreaRegistration.RegisterAllAreas(); 
     FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); 
     RouteConfig.RegisterRoutes(RouteTable.Routes); 
     BundleConfig.RegisterBundles(BundleTable.Bundles); 

     var mapper = new AutoMapperConfig(); 
     mapper.Execute(Assembly.GetExecutingAssembly()); 
    } 

Ich freue mich auf eine Idee zur Lösung dieses Fehlers zu sehen, und wie zu injizieren dieser IConfigurationProvider?

Answer 1

Anstatt zu versuchen, die IConfigurationProvider-Abhängigkeit aufzulösen, könnte ich den Ansatz vorschlagen, IMapper einer bereits initialisierten Instanz von Mapper zuzuordnen. Der Autoadapter-Initialisierungscode wird nun zur Ninject-Konfigurationszeit statt in Global.asax ausgeführt.

Die Änderungen würde ich vorschlagen, sind wie folgt:

AutoMapperConfig.cs:

public static class AutoMapperConfig 
{ 
    public static IMapperConfigurationExpression Configuration { get; private set; } 
    public static IMapper MapperInstance { get; private set; } 

    static AutoMapperConfig() 
    { 
     Mapper.Initialize(cfg => 
     { 
      var types = Assembly.GetExecutingAssembly().GetExportedTypes(); 
      LoadStandardMappings(types, cfg); 
      LoadCustomMappings(types, cfg); 
      Configuration = cfg; 
     }); 

     MapperInstance = Mapper.Instance; 
    } 

    private static void LoadStandardMappings(IEnumerable<Type> types, IMapperConfigurationExpression mapperConfiguration) 
    { 
     var maps = (from t in types 
        from i in t.GetInterfaces() 
        where i.IsGenericType && i.GetGenericTypeDefinition() == typeof(IMapFrom<>) && 
          !t.IsAbstract && 
          !t.IsInterface 
        select new 
        { 
         Source = i.GetGenericArguments()[0], 
         Destination = t 
        }).ToArray(); 

     foreach (var map in maps) 
     { 
      mapperConfiguration.CreateMap(map.Source, map.Destination); 
      mapperConfiguration.CreateMap(map.Destination, map.Source); 
     } 
    } 

    private static void LoadCustomMappings(IEnumerable<Type> types, IMapperConfigurationExpression mapperConfiguration) 
    { 
     var maps = (from t in types 
        from i in t.GetInterfaces() 
        where typeof(IHaveCustomMappings).IsAssignableFrom(t) && 
          !t.IsAbstract && 
          !t.IsInterface 
        select (IHaveCustomMappings)Activator.CreateInstance(t)).ToArray(); 

     foreach (var map in maps) 
     { 
      map.CreateMappings(mapperConfiguration); 
     } 
    } 
} 

NinjectConfig:

private static void RegisterServices(IKernel kernel) 
{ 
    kernel.Bind(x => 
    { 
     x.FromThisAssembly() 
     .SelectAllClasses() 
     .BindDefaultInterface(); 
    }); 

    kernel.Bind(x => 
    { 
     x.FromAssemblyContaining(typeof(IService)) 
     .SelectAllClasses() 
     .BindDefaultInterface(); 
    }); 

    kernel.Bind(typeof(IEfRepository<>)).To(typeof(EfRepository<>)); 
    kernel.Bind(typeof(DbContext), typeof(MsSqlDbContext)).To<MsSqlDbContext>().InRequestScope(); 
    kernel.Bind<ISaveContext>().To<SaveContext>(); 
    kernel.Bind<IMapper>().ToMethod(ctx => AutoMapperConfig.MapperInstance); 
} 

Global.asax:

protected void Application_Start() 
{ 
    Database.SetInitializer(new MigrateDatabaseToLatestVersion<MsSqlDbContext, Configuration>()); 

    AreaRegistration.RegisterAllAreas(); 
    FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); 
    RouteConfig.RegisterRoutes(RouteTable.Routes); 
    BundleConfig.RegisterBundles(BundleTable.Bundles); 
}