尝试获取ICacheManager类型的实例键“ Cache Manager”时发生激活错误

分类：编程问答

如何解决尝试获取ICacheManager类型的实例键“ Cache Manager”时发生激活错误

|| 我似乎在这里碰到了墙，并希望任何能够做到这一点的人提供帮助。我不确定以下错误消息的含义。我正在使用企业模式服务的缓存块，但是我一直遇到以下问题。我下载了最新版本，并尝试逐步解决该问题，但是我似乎无法找出确切的问题，请寻求帮助。提前致谢 
Test method WorldBank.Service.Business.UnitTest.TopicsManagerTest.Call_Children_out_of_schoolTest threw exception: 
Microsoft.Practices.ServiceLocation.ActivationException: Activation error occured while trying to get instance of type ICacheManager,key \"Cache Manager\" ---> Microsoft.Practices.Unity.ResolutionFailedException: Resolution of the dependency failed,type = \"Microsoft.Practices.EnterpriseLibrary.Caching.ICacheManager\",name = \"Cache Manager\".
Exception occurred while: while resolving.
Exception is: InvalidOperationException - The current type,Microsoft.Practices.EnterpriseLibrary.Caching.ICacheManager,is an interface and cannot be constructed. Are you missing a type mapping?
-----------------------------------------------
At the time of the exception,the container was:

  Resolving Microsoft.Practices.EnterpriseLibrary.Caching.ICacheManager,WuCache
 ---> System.InvalidOperationException: The current type,is an interface and cannot be constructed. Are you missing a type mapping?


Microsoft.Practices.ObjectBuilder2.DynamicMethodConstructorStrategy.ThrowForAttemptingToConstructInterface(IBuilderContext context) in e:\\Builds\\Unity\\UnityTemp\\Compile\\Unity\\Unity\\Src\\ObjectBuilder\\Strategies\\BuildPlan\\DynamicMethod\\Creation\\DynamicMethodConstructorStrategy.cs: line 209
BuildUp_Microsoft.Practices.EnterpriseLibrary.Caching.ICacheManager(IBuilderContext )
Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp(IBuilderContext context) in e:\\Builds\\Unity\\UnityTemp\\Compile\\Unity\\Unity\\Src\\ObjectBuilder\\Strategies\\BuildPlan\\DynamicMethod\\DynamicMethodBuildPlan.cs: line 37
Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext context) in e:\\Builds\\Unity\\UnityTemp\\Compile\\Unity\\Unity\\Src\\ObjectBuilder\\Strategies\\BuildPlan\\BuildPlanStrategy.cs: line 43
Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context) in e:\\Builds\\Unity\\UnityTemp\\Compile\\Unity\\Unity\\Src\\ObjectBuilder\\Strategies\\StrategyChain.cs: line 110
Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t,Object existing,String name,IEnumerable`1 resolverOverrides) in e:\\Builds\\Unity\\UnityTemp\\Compile\\Unity\\Unity\\Src\\UnityContainer.cs: line 511
Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t,IEnumerable`1 resolverOverrides) in e:\\Builds\\Unity\\UnityTemp\\Compile\\Unity\\Unity\\Src\\UnityContainer.cs: line 515
Microsoft.Practices.Unity.UnityContainer.Resolve(Type t,ResolverOverride[] resolverOverrides) in e:\\Builds\\Unity\\UnityTemp\\Compile\\Unity\\Unity\\Src\\UnityContainer.cs: line 173
Microsoft.Practices.Unity.UnityServiceLocator.DoGetInstance(Type serviceType,String key) in e:\\Builds\\Unity\\UnityTemp\\Compile\\Unity\\Unity\\Src\\UnityServiceLocator.cs: line 64
Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance(Type serviceType,String key) in c:\\Home\\Chris\\Projects\\CommonServiceLocator\\main\\Microsoft.Practices.ServiceLocation\\ServiceLocatorImplBase.cs: line 49
Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance(Type serviceType,String key) in c:\\Home\\Chris\\Projects\\CommonServiceLocator\\main\\Microsoft.Practices.ServiceLocation\\ServiceLocatorImplBase.cs: line 53
Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance[TService](String key) in c:\\Home\\Chris\\Projects\\CommonServiceLocator\\main\\Microsoft.Practices.ServiceLocation\\ServiceLocatorImplBase.cs: line 103
Microsoft.Practices.EnterpriseLibrary.Caching.CacheFactory.InnerGetCacheManager(String cacheManagerName) in e:\\Builds\\EntLib\\Latest\\Source\\Blocks\\Caching\\Src\\Caching\\CacheFactory.cs: line 66
Microsoft.Practices.EnterpriseLibrary.Caching.CacheFactory.GetCacheManager(String cacheManagerName) in e:\\Builds\\EntLib\\Latest\\Source\\Blocks\\Caching\\Src\\Caching\\CacheFactory.cs: line 53
WorldBank.Service.Business.ResponseManager.Get_w_Utility() in C:\\SOOfficialPiece\\WorldBank.Service.Business\\ResponseManager.cs: line 42
WorldBank.Service.Business.ResponseManager..ctor() in C:\\SOOfficialPiece\\WorldBank.Service.Business\\ResponseManager.cs: line 34
WorldBank.Service.Business.ResponseManager.getResponseObjectJSON(Int32 perpage,Object results,Boolean doDeepRetrieval) in C:\\SOOfficialPiece\\WorldBank.Service.Business\\ResponseManager.cs: line 68
System.Dynamic.UpdateDelegates.UpdateAndExecute4[T0,T1,T2,T3,TRet](CallSite site,T0 arg0,T1 arg1,T2 arg2,T3 arg3)
WorldBankBusiness.Topics.TopicsManager.Call_Children_out_of_school(PersonType persontype,EnrollmentType enrollmenttype,String countrycode) in C:\\SOOfficialPiece\\WorldBank.Service.Business\\TopicsManager.cs: line 39
WorldBank.Service.Business.UnitTest.TopicsManagerTest.Call_Children_out_of_schoolTest() in C:\\SOOfficialPiece\\WorldBank.Service.Business.UnitTest\\TopicsManagerTest.cs: line 88
    

解决方法

        缓存应用程序块需要在app / web.config中存在一些配置信息才能使用（AFAIK，不幸的是，很难找到其他说明的文档）。如果没有该配置信息，则以下代码将导致抛出与您看到的相同的异常： 
var cm = CacheFactory.GetCacheManager(\"MyCacheManager\");
为了获得
CacheManager
，您需要在app.config或web.config中定义
CacheManager
： 
<configuration>
    <configSections>
        <section name=\"cachingConfiguration\" 
                 type=\"Microsoft.Practices.EnterpriseLibrary.Caching.Configuration.CacheManagerSettings,Microsoft.Practices.EnterpriseLibrary.Caching,Version=5.0.414.0,Culture=neutral,PublicKeyToken=31bf3856ad364e35\" requirePermission=\"true\" />
    </configSections>
    <cachingConfiguration defaultCacheManager=\"MyCacheManager\">
        <cacheManagers>
           <add name=\"MyCacheManager\" type=\"Microsoft.Practices.EnterpriseLibrary.Caching.CacheManager,PublicKeyToken=31bf3856ad364e35\" 
                expirationPollFrequencyInSeconds=\"60\" 
                maximumElementsInCacheBeforeScavenging=\"50000\" 
                numberToRemoveWhenScavenging=\"1000\"  
                backingStoreName=\"NullBackingStore\" />
        </cacheManagers>
        <backingStores>
            <add type=\"Microsoft.Practices.EnterpriseLibrary.Caching.BackingStoreImplementations.NullBackingStore,PublicKeyToken=31bf3856ad364e35\" 
                 name=\"NullBackingStore\" />
        </backingStores>
    </cachingConfiguration>
</configuration>
添加配置值后，您应该能够从ѭ6中获得一个有效的ѭ2。该帖子还提供了一些可能对您有帮助的更多信息。 值得注意的是，如果使用的是.NET 4.0，则对于非Web应用程序，可以使用MemoryCache（在“ 7”名称空间中），该功能提供类似的功能，但不需要所有此配置。对于Web应用程序，您当然可以使用
System.Web.Caching
中的Cache类。     

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