Microsoft Unity IoC不起作用和ASP.NET mvc4應用程序。爲什麼？

Question

我正在嘗試將Unity IoC容器設置爲ASP.NET mvc4應用程序。 我創建的空項目，並使用包管理控制檯安裝下一個產品

• 安裝，包裝統一
• 安裝，包裝Unity.Mvc4

一切都順利完成。但是在運行我的應用程序後，我有例外

說明：執行當前Web請求期間發生未處理的異常。請查看堆棧跟蹤以獲取有關該錯誤的更多信息以及源代碼的位置。 異常詳細信息：System.MissingMethodException：無法創建接口的實例。

這裏是簡單的代碼。 的Global.asax.cs

public class MvcApplication : System.Web.HttpApplication 
{ 
    protected void Application_Start() 
    { 
     AreaRegistration.RegisterAllAreas(); 

     WebApiConfig.Register(GlobalConfiguration.Configuration); 
     FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); 
     RouteConfig.RegisterRoutes(RouteTable.Routes); 

     Bootstrapper.Initialise(); 
    } 
} 

public interface IA 
{ 
    void test(); 
} 
public class A : IA 
{ 
    public A() { } 
    public void test() 
    { 
     throw new NotImplementedException(); 
    } 
} 

HomeController.cs

public class HomeController : Controller 
{ 
    // 
    // GET: /Home/ 

    public ActionResult Index(IA a) 
    { 
     return View(); 
    } 

} 

Bootstrapper.cs：

public static class Bootstrapper 
{ 
    public static void Initialise() 
    { 
     var container = BuildUnityContainer(); 

     DependencyResolver.SetResolver(new UnityDependencyResolver(container)); 
    } 

    private static IUnityContainer BuildUnityContainer() 
    { 
     var container = new UnityContainer(); 

     container.RegisterType<IA, A>();   

     return container; 
    } 
} 

我在做什麼錯，爲什麼代碼不能正常工作？

堆棧跟蹤：

堆棧跟蹤：[MissingMethodException：無法創建接口的實例] System.RuntimeTypeHandle.CreateInstance（RuntimeType類型，布爾publicOnly，布爾NOCHECK，布爾& canBeCached，RuntimeMethodHandleInternal &構造函數，布爾& bNeedSecurityCheck）0 System.RuntimeType.CreateInstanceSlow（布爾publicOnly，布爾skipCheckThis，布爾fillCache）98 System.RuntimeType.CreateInstanceDefaultCtor（布爾publicOnly，布爾skipVisibilityChecks，布爾skipCheckThis，啵精簡fillCache）+241 System.Activator.CreateInstance（Type type，Boolean nonPublic）+69 System.Web.Mvc.DefaultModelBinder.CreateModel（ControllerContext controllerContext，ModelBindingContext bindingContext，Type modelType）+190 System.Web.Mvc.DefaultModelBinder .BindComplexModel（controllerContext controllerContext，ModelBindingContext的BindingContext）572 System.Web.Mvc.DefaultModelBinder.BindModel（controllerContext controllerContext，ModelBindingContext的BindingContext）454 System.Web.Mvc.ControllerActionInvoker.GetParameterValue（controllerContext controllerContext，ParameterDescriptor parameterDescriptor）317 System.Web.Mvc.ControllerActionInvoker.GetParameterValues（ControllerContext controllerContext，ActionDescriptor actionDescriptor）+117 System.Web.Mvc.A同步。 <> C_ DisplayClass25.b _1e（的AsyncCallback的AsyncCallback，對象asyncState）476 System.Web.Mvc.Async.WrappedAsyncResult 1.Begin(AsyncCallback callback, Object state, Int32 timeout) +124 System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state) +304 System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__17(AsyncCallback asyncCallback, Object asyncState) +30 System.Web.Mvc.Async.WrappedAsyncResult 1.Begin（AsyncCallback的回調，對象的狀態，的Int32超時）124 System.Web.Mvc .Controller.BeginExecuteCore（AsyncCallback callback，Object state）+389 System.Web.Mvc.Async.WrappedAsyncResult 1.Begin(AsyncCallback callback, Object state, Int32 timeout) +124 System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +319 System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +15 System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__2(AsyncCallback asyncCallback, Object asyncState) +76 System.Web.Mvc.Async.WrappedAsyncResult 1。開始（AsyncCallback回調，對象狀態，Int32超時）+124 System.Web.Mvc.MvcHandler.BeginProcessRequest（HttpContextBase httpContext，AsyncCallback回調，對象狀態）+251 System.Web.Mvc.MvcHandler.BeginProcessRequest（HttpContext httpContext，AsyncCallback回調，對象狀態）+50 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest（HttpContext上下文，AsyncCallback cb，Object extraData）+16 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep。執行（）8837208 System.Web.HttpApplication.ExecuteStep（IExecutionStep步驟，布爾& completedSynchronously）184

Answer 1

我完全不知道你的問題，但這裏是適用於我的設置;

public static class Bootstrapper 
{ 
    public static void Initialise() 
    { 
     var container = BuildUnityContainer(); 
     DependencyResolver.SetResolver(new UnityDependencyResolver(container)); 
    } 

    private static IUnityContainer BuildUnityContainer() 
    { 
     var container = new UnityContainer(); 
     container.RegisterType<ICategoryRepository, CategoryRepository>(new HierarchicalLifetimeManager()); 
     return container; 
    } 
} 

的Global.asax

Bootstrapper.Initialise(); 

現在

，在我的控制器構造;

ICategoryRepository _catRepo; 

public CategoryController(ICategoryRepository catRepo) 
{ 
    _catRepo = catRepo; 
} 
public ActionResult Index() 
{ 
    ViewBag.CategoriesList = _catRepo.GetAllCategories(); 
    return View(); 
}