asp.net-mvc – Unity和Random“索引超出了数组的范围”异常

我们有两个Web服务器后面的负载均衡器.

有时每天有时会在一周内有一次我们的Web服务器停止执行请求并开始响应并出现错误,并且每个请求都会记录以下异常：
“System.IndexOutOfRangeException – 索引超出了数组的范围.”

我们的环境：IIS 8.5,.Net 4.5.0,Mvc 5.1.0,Unity 3.5(与3.0相同),WebActivatorEx 2.0
在IIS中,工作进程1和其他设置具有默认值.

我们无法捕捉到任何特定情况造成此错误.应用程序池回收后,一切都没有问题.在每个请求响应错误之前,没有任何与之相关的错误.

过去有一个问题与相关的旧Unity版本有关：
https://unity.codeplex.com/discussions/328841
http://unity.codeplex.com/workitem/11791
无法看到我能做些什么.

这里有异常细节：

System.IndexOutOfRangeException
Index was outside the bounds of the array.

System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.Collections.Generic.List`1.Enumerator.MoveNext()
   at System.Linq.Enumerable.WhereListIterator`1.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Microsoft.Practices.Unity.NamedTypesRegistry.RegisterType(Type t,String name)
   at Microsoft.Practices.Unity.UnityDefaultBehaviorExtension.OnRegisterInstance(Object sender,RegisterInstanceEventArgs e)
   at System.EventHandler`1.Invoke(Object sender,TEventArgs e)
   at Microsoft.Practices.Unity.UnityContainer.RegisterInstance(Type t,String name,Object instance,LifetimeManager lifetime)
   at Microsoft.Practices.Unity.UnityContainerExtensions.RegisterInstance[TInterface](IUnityContainer container,TInterface instance,LifetimeManager lifetimeManager)
   at DemoSite.News.Portal.UI.App_Start.UnityConfig.<>c__DisplayClass1.<RegisterTypes>b__0()
   at DemoSite.News.Portal.Core.Controller.BaseController.Initialize(RequestContext requestContext)
   at System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext,AsyncCallback callback,Object state)
   at System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__4(AsyncCallback asyncCallback,Object asyncState,ProcessRequestState innerState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback,Object callbackState)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.Begin(AsyncCallback callback,Object state,Int32 timeout)
   at System.Web.Mvc.Async.AsyncResultWrapper.Begin[TState](AsyncCallback callback,Object callbackState,BeginInvokeDelegate`1 beginDelegate,EndInvokeVoidDelegate`1 endDelegate,TState invokeState,Object tag,Int32 timeout,SynchronizationContext callbackSyncContext)
   at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext,Object state)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,Boolean& completedSynchronously)

我的配置如下：

public static void RegisterTypes(IUnityContainer container) 
{ 
    var section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
    container.LoadConfiguration(section); 
    ServiceLocator.SetLocatorProvider(() => new UnityServiceLocator(container));
}

初始化方法如下：

protected override void Initialize(System.Web.Routing.RequestContext requestContext)
{
    if (requestContext.RouteData.Values["ViewActionId"] != null)
    {
        int viewActionId;
        if (!int.TryParse(requestContext.RouteData.Values["ViewActionId"].ToString(),out viewActionId))
            return;

        var cacheProvider = ServiceLocator.Current.GetInstance<ICacheProvider>();
        List<ViewActionClass> viewActionClasses = null;
        string cacheKey = CacheKeyCompute.ComputeCacheKey("ViewActionClass",CacheKeyTypes.DataCache,new KeyValuePair<string,string>("viewActionId",viewActionId.ToString()));

        _configuration = ServiceLocator.Current.GetInstance<IConfiguration>();

        viewActionClasses = 
            cacheProvider.AddOrGetExistingWithLock<List<ViewActionClass>>(cacheKey,() =>
        {
            var viewActionClassBusiness = 
            ServiceLocator.Current.GetInstance<IViewActionClassBusiness>();

            return viewActionClassBusiness.ViewActionClassGetByViewActionId(viewActionId);
        });

        ViewBag.ActionClass = viewActionClasses;
        ViewBag.Configuration = _configuration;
    }
    base.Initialize(requestContext);
}

注册xml for ICacheProvider,IConfiguration和IViewActionClassBusiness

<type type="DemoSite.Runtime.Caching.ICacheProvider,DemoSite.Core"
        mapTo="DemoSite.Runtime.Caching.ObjectCacheProvider,DemoSite.Core">
    <lifetime type="containerControlledLifetimeManager" />
  </type>
<type type="DemoSite.Core.Configuration.IConfiguration,DemoSite.Core"
        mapTo="DemoSite.Core.Configuration.ConfigFileConfiguration,DemoSite.Core">
    <lifetime type="containerControlledLifetimeManager" />
  </type>
<type type="DemoSite.News.Business.IViewActionClassBusiness,DemoSite.News.Business"
        mapTo="DemoSite.News.Business.Default.ViewActionClassBusiness,DemoSite.News.Business.Default">
    <lifetime type="perRequestLifetimeManager" />
  </type>

也许它与高流量有关.
是否有人遇到类似的问题和任何解决方案？

提前致谢