在DisposeOfChildContainer（）上使用Microsoft.Unity的空引用异常

Question

我正在研究mvc-5应用程序，它也有webapi。应用程序正在抛出System.NullReference异常。

错误消息

System.NullReferenceException: Object reference not set to an instance of an object.

Stack trace

at Unity.Mvc5.UnityDependencyResolver.DisposeOfChildContainer()

at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

这是容器的构建方式，并在全局中从Application_Start调用，作为UnityBootstrapper.Initialize（）; -

public static class UnityBootstrapper
{
    public static void Initialize()
    {
        var container = BuildUnityContainer();
        DependencyResolver.SetResolver(new Unity.Mvc5.UnityDependencyResolver(container));
        GlobalConfiguration.Configuration.DependencyResolver = new Unity.WebApi.UnityDependencyResolver(container);
        ControllerBuilder.Current.SetControllerFactory(new UnityMvcControllerFactory(container));
    }
    private static IUnityContainer BuildUnityContainer()
    {
        var container = new UnityContainer();

        // MVC/WebApi controller factories
        container.RegisterInstance<IHttpControllerActivator>(new UnityApiControllerActivator(container,
            new DefaultHttpControllerActivator()));

        // NHibernate sessions            
        container.RegisterInstance<ISessionBuilder>(SessionBuilder.Instance);
        container.RegisterType<IClientCodeRequestContext, ClientCodeRequestContext>(
            new CurrentRequestContextLifetimeManager<IClientCodeRequestContext>());
        container.RegisterType<IUnitOfWork, UnitOfWork>(
            new CurrentRequestContextLifetimeManager<IUnitOfWork>(),
            new InjectionConstructor(container.Resolve<ISessionBuilder>()));
        container.RegisterType<IUnitOfWorkContext>(
            new InjectionFactory(c => container.Resolve<IUnitOfWork>().CommonContext));
        container.RegisterType<IUnitOfWorkClientContext>(
            new InjectionFactory(
                c => container.Resolve<IUnitOfWork>()[container.Resolve<IClientCodeRequestContext>().ClientCode]));

        //Repositories
        container.RegisterType<IUserRepository, UserRepository>();
        //Business Logic
        container.RegisterType<IMembershipPrincipalBusiness, MembershipPrincipalBusiness>();
        // Other
        container.RegisterType<IAuthenticationProvider, CoreMembershipProvider>();
        return container;
    }
}

在global.asax.cs -

中

protected void Application_PostAuthenticateRequest(object sender, EventArgs e)

    {
        var principalBusiness = DependencyResolver.Current.GetService<IMembershipPrincipalBusiness>();
    }

这个问题仅在生产中，并且被新生物捕获。

异常是一个统一的错误还是在这个实现中错过了什么。我一周以来一直在搜索这个问题，但却找不到任何东西。