WPF unity尝试获取类型实例时发生激活错误

Question

尝试使用Unity和Prism初始化模块时出现以下错误。该DLL由

找到

return new DirectoryModuleCatalog() { ModulePath = @".\Modules" };

找到dll并找到名称

  #region Constructors

    public AdminModule(
        IUnityContainer container,
        IScreenFactoryRegistry screenFactoryRegistry,
        IEventAggregator eventAggregator,
        IBusyService busyService
        )
        : base(container, screenFactoryRegistry)
    {
        this.EventAggregator = eventAggregator;
        this.BusyService = busyService;
    }

    #endregion

    #region Properties

    protected IEventAggregator EventAggregator { get; set; }
    protected IBusyService BusyService { get; set; }

    #endregion

    public override void Initialize()
    {
        base.Initialize();
    }

    #region Register Screen Factories

    protected override void RegisterScreenFactories()
    {
        this.ScreenFactoryRegistry.Register(ScreenKeyType.ApplicationAdmin, typeof(AdminScreenFactory));
    }

    #endregion

    #region Register Views and Various Services

    protected override void RegisterViewsAndServices()
    {
        //View Models
        this.Container.RegisterType<IAdminViewModel, AdminViewModel>();

               }

    #endregion

产生错误的代码是：

namespace Microsoft.Practices.Composite.Modularity
    protected virtual IModule CreateModule(string typeName)
        {
            Type moduleType = Type.GetType(typeName);
            if (moduleType == null)
            {
                throw new ModuleInitializeException(string.Format(CultureInfo.CurrentCulture, Properties.Resources.FailedToGetType, typeName));
            }

            return (IModule)this.serviceLocator.GetInstance(moduleType); <-- Error Here
        }

任何人都可以帮助我

以下错误记录：

一般信息

---

Additional Info:
ExceptionManager.MachineName: xxxxx
ExceptionManager.TimeStamp: 22/02/2010 10:16:55 AM
ExceptionManager.FullName: Microsoft.ApplicationBlocks.ExceptionManagement, Version=1.0.3591.32238, Culture=neutral, PublicKeyToken=null
ExceptionManager.AppDomainName: Infinity.vshost.exe
ExceptionManager.ThreadIdentity: 
ExceptionManager.WindowsIdentity: xxxxx

1）例外信息

---

Exception Type: Microsoft.Practices.Composite.Modularity.ModuleInitializeException
ModuleName: AdminModule
Message: An exception occurred while initializing module 'AdminModule'. 
    - The exception message was: Activation error occured while trying to get instance of type AdminModule, key ""
    Check the InnerException property of the exception for more information. If the exception occurred 
    while creating an object in a DI container, you can exception.GetRootException() to help locate the 
    root cause of the problem. 
Data: System.Collections.ListDictionaryInternal
TargetSite: Void HandleModuleInitializationError(Microsoft.Practices.Composite.Modularity.ModuleInfo, System.String, System.Exception)
HelpLink: NULL
Source: Microsoft.Practices.Composite

StackTrace信息

---

  at Microsoft.Practices.Composite.Modularity.ModuleInitializer.HandleModuleInitializationError(ModuleInfo moduleInfo, String assemblyName, Exception exception)
   at Microsoft.Practices.Composite.Modularity.ModuleInitializer.Initialize(ModuleInfo moduleInfo)
   at Microsoft.Practices.Composite.Modularity.ModuleManager.InitializeModule(ModuleInfo moduleInfo)
   at Microsoft.Practices.Composite.Modularity.ModuleManager.LoadModulesThatAreReadyForLoad()
   at Microsoft.Practices.Composite.Modularity.ModuleManager.OnModuleTypeLoaded(ModuleInfo typeLoadedModuleInfo, Exception error)
   at Microsoft.Practices.Composite.Modularity.FileModuleTypeLoader.BeginLoadModuleType(ModuleInfo moduleInfo, ModuleTypeLoadedCallback callback)
   at Microsoft.Practices.Composite.Modularity.ModuleManager.BeginRetrievingModule(ModuleInfo moduleInfo)
   at Microsoft.Practices.Composite.Modularity.ModuleManager.LoadModuleTypes(IEnumerable`1 moduleInfos)
   at Microsoft.Practices.Composite.Modularity.ModuleManager.LoadModulesWhenAvailable()
   at Microsoft.Practices.Composite.Modularity.ModuleManager.Run()
   at Microsoft.Practices.Composite.UnityExtensions.UnityBootstrapper.InitializeModules()
   at Infinity.Bootstrapper.InitializeModules() in D:\Projects\dotNet\Infinity\source\Inifinty\Infinity\Application Modules\BootStrapper.cs:line 75
   at Microsoft.Practices.Composite.UnityExtensions.UnityBootstrapper.Run(Boolean runWithDefaultConfiguration)
   at Microsoft.Practices.Composite.UnityExtensions.UnityBootstrapper.Run()
   at Infinity.App.Application_Startup(Object sender, StartupEventArgs e) in D:\Projects\dotNet\Infinity\source\Inifinty\Infinity\App.xaml.cs:line 37
   at System.Windows.Application.OnStartup(StartupEventArgs e)
   at System.Windows.Application.<.ctor>b__0(Object unused)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)

2）异常信息

---

Exception Type: Microsoft.Practices.ServiceLocation.ActivationException
Message: Activation error occured while trying to get instance of type AdminModule, key ""
Data: System.Collections.ListDictionaryInternal
TargetSite: System.Object GetInstance(System.Type, System.String)
HelpLink: NULL
Source: Microsoft.Practices.ServiceLocation

StackTrace信息

---

 at Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance(Type serviceType, String key)
   at Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance(Type serviceType)
   at Microsoft.Practices.Composite.Modularity.ModuleInitializer.CreateModule(String typeName)
   at Microsoft.Practices.Composite.Modularity.ModuleInitializer.Initialize(ModuleInfo moduleInfo)

3）异常信息

---

Exception Type: Microsoft.Practices.Unity.ResolutionFailedException
TypeRequested: AdminModule
NameRequested: NULL
Message: Resolution of the dependency failed, type = "Infinity.Modules.Admin.AdminModule", name = "". Exception message is: The current build operation (build key Build Key[Infinity.Modules.Admin.AdminModule, null]) failed: The parameter screenFactoryRegistry could not be resolved when attempting to call constructor Infinity.Modules.Admin.AdminModule(Microsoft.Practices.Unity.IUnityContainer container, PhoenixIT.IScreenFactoryRegistry screenFactoryRegistry, Microsoft.Practices.Composite.Events.IEventAggregator eventAggregator, PhoenixIT.IBusyService busyService). (Strategy type BuildPlanStrategy, index 3)
Data: System.Collections.ListDictionaryInternal
TargetSite: System.Object DoBuildUp(System.Type, System.Object, System.String)
HelpLink: NULL
Source: Microsoft.Practices.Unity

StackTrace Information
*********************************************
   at Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, Object existing, String name)
   at Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, String name)
   at Microsoft.Practices.Unity.UnityContainer.Resolve(Type t, String name)
   at Microsoft.Practices.Composite.UnityExtensions.UnityServiceLocatorAdapter.DoGetInstance(Type serviceType, String key)
   at Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance(Type serviceType, String key)

4）异常信息

---

Exception Type: Microsoft.Practices.ObjectBuilder2.BuildFailedException
ExecutingStrategyTypeName: BuildPlanStrategy
ExecutingStrategyIndex: 3
BuildKey: Build Key[Infinity.Modules.Admin.AdminModule, null]
Message: The current build operation (build key Build Key[Infinity.Modules.Admin.AdminModule, null]) failed: The parameter screenFactoryRegistry could not be resolved when attempting to call constructor Infinity.Modules.Admin.AdminModule(Microsoft.Practices.Unity.IUnityContainer container, PhoenixIT.IScreenFactoryRegistry screenFactoryRegistry, Microsoft.Practices.Composite.Events.IEventAggregator eventAggregator, PhoenixIT.IBusyService busyService). (Strategy type BuildPlanStrategy, index 3)
Data: System.Collections.ListDictionaryInternal
TargetSite: System.Object ExecuteBuildUp(Microsoft.Practices.ObjectBuilder2.IBuilderContext)
HelpLink: NULL
Source: Microsoft.Practices.ObjectBuilder2

StackTrace信息

---

 at Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context)
   at Microsoft.Practices.ObjectBuilder2.Builder.BuildUp(IReadWriteLocator locator, ILifetimeContainer lifetime, IPolicyList policies, IStrategyChain strategies, Object buildKey, Object existing)
   at Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, Object existing, String name)

5）异常信息

---

Exception Type: System.InvalidOperationException
Message: The parameter screenFactoryRegistry could not be resolved when attempting to call constructor Infinity.Modules.Admin.AdminModule(Microsoft.Practices.Unity.IUnityContainer container, PhoenixIT.IScreenFactoryRegistry screenFactoryRegistry, Microsoft.Practices.Composite.Events.IEventAggregator eventAggregator, PhoenixIT.IBusyService busyService).
Data: System.Collections.ListDictionaryInternal
TargetSite: Void ThrowForResolutionFailed(System.Exception, System.String, System.String, Microsoft.Practices.ObjectBuilder2.IBuilderContext)
HelpLink: NULL
Source: Microsoft.Practices.ObjectBuilder2

StackTrace信息

---

at Microsoft.Practices.ObjectBuilder2.DynamicMethodConstructorStrategy.ThrowForResolutionFailed(Exception inner, String parameterName, String constructorSignature, IBuilderContext context)
   at BuildUp_Infinity.Modules.Admin.AdminModule(IBuilderContext )
   at Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp(IBuilderContext context)
   at Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext context)
   at Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context)

6）异常信息

---

Exception Type: Microsoft.Practices.ObjectBuilder2.BuildFailedException
ExecutingStrategyTypeName: BuildPlanStrategy
ExecutingStrategyIndex: 3
BuildKey: Build Key[PhoenixIT.IScreenFactoryRegistry, null]
Message: The current build operation (build key Build Key[PhoenixIT.IScreenFactoryRegistry, null]) failed: The current type, PhoenixIT.IScreenFactoryRegistry, is an interface and cannot be constructed. Are you missing a type mapping? (Strategy type BuildPlanStrategy, index 3)
Data: System.Collections.ListDictionaryInternal
TargetSite: System.Object ExecuteBuildUp(Microsoft.Practices.ObjectBuilder2.IBuilderContext)
HelpLink: NULL
Source: Microsoft.Practices.ObjectBuilder2

StackTrace信息

---

 at Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context)
   at Microsoft.Practices.Unity.ObjectBuilder.NamedTypeDependencyResolverPolicy.Resolve(IBuilderContext context)
   at BuildUp_Infinity.Modules.Admin.AdminModule(IBuilderContext )

7）异常信息

---

Exception Type: System.InvalidOperationException
Message: The current type, PhoenixIT.IScreenFactoryRegistry, is an interface and cannot be constructed. Are you missing a type mapping?
Data: System.Collections.ListDictionaryInternal
TargetSite: Void ThrowForAttemptingToConstructInterface(Microsoft.Practices.ObjectBuilder2.IBuilderContext)
HelpLink: NULL
Source: Microsoft.Practices.ObjectBuilder2

StackTrace信息

---

  at Microsoft.Practices.ObjectBuilder2.DynamicMethodConstructorStrategy.ThrowForAttemptingToConstructInterface(IBuilderContext context)
   at BuildUp_PhoenixIT.IScreenFactoryRegistry(IBuilderContext )
   at Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp(IBuilderContext context)
   at Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext context)
   at Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context)

有关详细信息，请参阅http://go.microsoft.com/fwlink/events.asp上的“帮助和支持中心”。

Answer 1

最重要的例外是问题。

您的模块类型需要一个名为“screenFactoryRegistry”的参数，类型为IScreenFactoryRegistry。由于IScreenFactoryRegistry是一个接口，并且您显然没有在容器中完成Register以将该接口映射到具体类型，因此Unity容器会抛出异常。

要解决此问题，您需要在Unity中映射该类型，可能在引导程序的ConfigureContainer方法中：

Container.RegisterType<IScreenFactoryRegistry, MyScreenFactoryRegistryImplementation>();