Unity错误-尝试获取IUserRepository类型的实例（键“”）时发生激活错误

Question

我正在尝试运行从Codeplex下载的MVC示例项目Shrinkr

我实际上在VS2012中打开了此解决方案，并且正在成功编译。 但是，当我运行此应用程序时，出现此错误。

我收到一条异常错误消息，指出“尝试获取类型为IUserRepository，键为“”的实例时发生激活错误

下面粘贴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

感谢您的建议以使其正常运行

Answer 1

根据我的经验，如果您下载了一个稳定的示例但无法运行它，则我完全不确定是什么问题，主要可能是参考问题。

因此，您可能会检查是否缺少任何DLL文件，并确保其路径为Asset / Plugins。 然后，检查Edit-ProjectSettings-Player-YourTargetPlatform-OtherSettings ，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:)