ASP.Net MVC 3应用程序在应用程序池回收时随机失败

应用程序池自动回收后,MVC虚拟应用程序经常出现故障.修复是手动回收ASP.NET 4.0 AppPool.我只需要回收一次,它总能解决问题.

我收到的应用程序错误似乎是程序集未正确加载时出现的错误.它们由NullReferenceException和Object引用组成,未将其设置为控制器和视图模型的对象实例.

问题是我无法按需重现这个,以便正确调试问题.我原以为应用程序池回收的顺序可能是一个问题,因此我将Classic池设置为每晚凌晨1点重新启动,而集成池将在凌晨1:15重新启动.不幸的是,这没有帮助.

关于assemblies being loaded on demand的这个答案很有意思,但是我不确定为什么错误很少发生,而且看似随意.

有没有人知道我将如何能够不断重现问题和/或潜在的解决方案？谢谢.

更新以包含示例堆栈跟踪：

Exception information: 
    Exception type: NullReferenceException 
    Exception message: Object reference not set to an instance of an object.
   at Bookstore.Controllers.BooksController.<>c__DisplayClass78.<Details>b__76(Grade g)
   at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source,Func`2 predicate)
   at Bookstore.Controllers.BooksController.Details(String booktitle)
   at lambda_method(Closure,ControllerBase,Object[] )
   at System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext,IDictionary`2 parameters)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext,ActionDescriptor actionDescriptor,IDictionary`2 parameters)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__36(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<>c__DisplayClass2a.<BeginInvokeAction>b__20()
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult)
   at System.Web.Mvc.Controller.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar)
   at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar)
   at System.Web.Mvc.MvcHandler.<>c__DisplayClass6.<>c__DisplayClassb.<BeginProcessRequest>b__4(IAsyncResult asyncResult)
   at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,Boolean& completedSynchronously)