Unity错误---试图获取类型为IUserRepository的实例时发生激活错误，密钥为“”&”；

本文关键字：错误 激活 密钥 实例 获取 取类型 Unity IUserRepository | 更新日期: 2023-09-27 18:26:00

我正在尝试运行从codeplex 下载的MVC示例项目Shrinker

我实际上在VS2012中打开了这个解决方案，并且正在成功编译。但是当我运行这个应用程序时，我会收到这个错误。

我收到一条异常错误消息，说明"尝试获取类型为IUserRepository，key的实例时发生激活错误"

粘贴在下面的是详细的异常消息

   Microsoft.Practices.ServiceLocation.ActivationException was unhandled by user code
  HResult=-2146233088
  Message=Activation error occured while trying to get instance of type IUserRepository, key ""
  Source=Microsoft.Practices.ServiceLocation
  StackTrace:
       at Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance(Type serviceType, String key)
       at Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance[TService]()
       at Shrinkr.Web.CreateDefaultUsers.ExecuteCore(IServiceLocator serviceLocator) in c:'Users'RON'Downloads'Shrinkr'Shrinkr.Web.Common'BootstrapperTask'CreateDefaultUsers.cs:line 19
       at System.Web.Mvc.Extensibility.BootstrapperTask.Execute(IServiceLocator serviceLocator)
       at System.Web.Mvc.Extensibility.Bootstrapper.Execute()
       at System.Web.Mvc.Extensibility.ExtendedMvcApplication.Application_Start()
  InnerException: Microsoft.Practices.Unity.ResolutionFailedException
       HResult=-2146233088
       Message=Resolution of the dependency failed, type = "Shrinkr.Repositories.IUserRepository", name = "". Exception message is: The current build operation (build key Build Key[Shrinkr.Infrastructure.EntityFramework.UserRepository, null]) failed: The parameter databaseFactory could not be resolved when attempting to call constructor Shrinkr.Infrastructure.EntityFramework.UserRepository(Shrinkr.Infrastructure.EntityFramework.IDatabaseFactory databaseFactory, Shrinkr.Infrastructure.EntityFramework.IQueryFactory queryFactory). (Strategy type BuildPlanStrategy, index 3)
       Source=Microsoft.Practices.Unity
       TypeRequested=IUserRepository
       StackTrace:
            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.Unity.UnityContainerBase.Resolve(Type t)
            at System.Web.Mvc.Extensibility.Unity.UnityAdapter.DoGetInstance(Type serviceType, String key)
            at Microsoft.Practices.ServiceLocation.ServiceLocatorImplBase.GetInstance(Type serviceType, String key)
       InnerException: Microsoft.Practices.ObjectBuilder2.BuildFailedException
            HResult=-2146233088
            Message=The current build operation (build key Build Key[Shrinkr.Infrastructure.EntityFramework.UserRepository, null]) failed: The parameter databaseFactory could not be resolved when attempting to call constructor Shrinkr.Infrastructure.EntityFramework.UserRepository(Shrinkr.Infrastructure.EntityFramework.IDatabaseFactory databaseFactory, Shrinkr.Infrastructure.EntityFramework.IQueryFactory queryFactory). (Strategy type BuildPlanStrategy, index 3)
            Source=Microsoft.Practices.ObjectBuilder2
            BuildKey=Build Key[Shrinkr.Infrastructure.EntityFramework.UserRepository, null]
            ExecutingStrategyIndex=3
            ExecutingStrategyTypeName=BuildPlanStrategy
            StackTrace:
                 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)
            InnerException: System.InvalidOperationException
                 HResult=-2146233079
                 Message=The parameter databaseFactory could not be resolved when attempting to call constructor Shrinkr.Infrastructure.EntityFramework.UserRepository(Shrinkr.Infrastructure.EntityFramework.IDatabaseFactory databaseFactory, Shrinkr.Infrastructure.EntityFramework.IQueryFactory queryFactory).
                 Source=Microsoft.Practices.ObjectBuilder2
                 StackTrace:
                      at Microsoft.Practices.ObjectBuilder2.DynamicMethodConstructorStrategy.ThrowForResolutionFailed(Exception inner, String parameterName, String constructorSignature, IBuilderContext context)
                      at BuildUp_Shrinkr.Infrastructure.EntityFramework.UserRepository(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)
                 InnerException: Microsoft.Practices.ObjectBuilder2.BuildFailedException

感谢您的建议，使其工作

Unity错误---试图获取类型为IUserRepository的实例时发生激活错误，密钥为“”&”；

严格来说，我不确定这是什么问题，根据我的经验，如果你下载了一个稳定的示例，但无法运行它，大部分可能是参考问题。

因此，您可以检查是否缺少任何DLL文件，并确保它们的路径是Asset/Plugins。然后，选中编辑项目设置播放器YourTargetPlatformOtherSettings，确认Api兼容性级别设置为.NET2.0（默认为子集）。

希望它能起作用，祝你好运：）

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