从缓存访问项目时ASP.NET UnauthorizedAccessException

我们有一些代码偶尔会刷新ASP.NET缓存中的某些键，以确保我们从Dynamics CRM系统获取最新数据。在大多数情况下，它似乎工作正常，但在页面重新加载时会出现间歇性异常，我怀疑这与强制缓存刷新有关

以下是UnauthorizedAccessException中的错误：

Access to the path 'appDomain=/LM/W3SVC/1/ROOT-1-129326029589946795:key=Microsoft.Xrm.Client.Services.InMemoryCrmCacheProvider:Crm:Query=953227368' is denied.

如果有帮助，以下是我刷新缓存项的方式：

 private void Flush()
    {
        IDictionaryEnumerator cacheEnum = this.HttpContext.Cache.GetEnumerator();
        while (cacheEnum.MoveNext())
        {
            var key = cacheEnum.Key.ToString();

            if (key.StartsWith("Microsoft.Xrm.Client.Services.InMemoryCrmCacheProvider:Crm:Query"))
                System.Web.HttpContext.Current.Cache.Remove(key);
        }
    }

我的问题是:

• 访问或删除缓存项是否需要某种级别的权限？我在谷歌上搜索了这个，但没有找到任何具体的内容（即使是在MSDN中）
• 你以前见过这个错误吗？你是怎么解决的

更新：这是stacktrace

Stacktrace:
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.Threading.Mutex.MutexTryCodeHelper.MutexTryCode(Object userData)
at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.Mutex..ctor(Boolean initiallyOwned, String name, Boolean& createdNew, MutexSecurity mutexSecurity)
at System.Threading.Mutex..ctor(Boolean initiallyOwned, String name, Boolean& createdNew)
at Microsoft.Xrm.Client.Threading.MutexExtensions.Lock(String key, Int32 millisecondsTimeout, Action`1 action)
at Microsoft.Xrm.Client.Threading.MutexExtensions.Get[T](String key, Int32 millisecondsTimeout, Func`2 loadFromCache, Func`2 loadFromService)
at Microsoft.Xrm.Client.Threading.MutexExtensions.Get[T](String key, Func`2 loadFromCache, Func`2 loadFromService, Action`2 addToCache)
at Microsoft.Xrm.Client.Services.InMemoryCrmCacheProvider.InnerExecute[TRequest,TResponse,TResult](TRequest request, Func`2 execute, Func`2 selector, String selectorCacheKey)
at Microsoft.Xrm.Client.Services.CachedOrganizationService.Execute[T](MetadataServiceRequest request, Func`5 execute, Func`2 selector, String selectorCacheKey)
at Microsoft.Xrm.Client.Services.CachedOrganizationService.Execute[T](MetadataServiceRequest request, Func`2 selector, String selectorCacheKey)
at Microsoft.Xrm.Client.Services.CachedOrganizationService.Execute(Object request)
at Microsoft.Xrm.Client.Services.IOrganizationServiceExtensions.RetrieveAllEntities(IOrganizationService service, MetadataItems metadataItems, Boolean retrieveAsIfPublished)
at Microsoft.Xrm.Client.Services.InMemoryCrmCacheProvider.GetId(DynamicEntity entity)
at Microsoft.Xrm.Client.Services.InMemoryCrmCacheProvider.<GetDependencies>d__48.MoveNext()
at Microsoft.Xrm.Client.Services.InMemoryCrmCacheProvider.<GetDependencies>d__41.MoveNext()
at System.Linq.Enumerable.<SelectManyIterator>d__14`2.MoveNext()
at Microsoft.Xrm.Client.Services.InMemoryCrmCacheProvider.<GetDependencies>d__2b.MoveNext()
at Microsoft.Xrm.Client.Services.InMemoryCrmCacheProvider.<GetDependencies>d__13.MoveNext()
at System.Linq.Enumerable.<DistinctIterator>d__81`1.MoveNext()
at Microsoft.Xrm.Client.Services.InMemoryCrmCacheProvider.GetCachePolicy(Object query, Object result)
at Microsoft.Xrm.Client.Services.InMemoryCrmCacheProvider.Insert(String key, Object query, Object result)
at Microsoft.Xrm.Client.Threading.MutexExtensions.<>c__DisplayClass5`1.<Get>b__4(String k)
at Microsoft.Xrm.Client.Threading.MutexExtensions.<>c__DisplayClass2`1.<Get>b__0(Mutex _)
at Microsoft.Xrm.Client.Threading.MutexExtensions.Lock(String key, Int32 millisecondsTimeout, Action`1 action)
at Microsoft.Xrm.Client.Threading.MutexExtensions.Get[T](String key, Int32 millisecondsTimeout, Func`2 loadFromCache, Func`2 loadFromService)
at Microsoft.Xrm.Client.Threading.MutexExtensions.Get[T](String key, Func`2 loadFromCache, Func`2 loadFromService, Action`2 addToCache)
at Microsoft.Xrm.Client.Services.InMemoryCrmCacheProvider.InnerExecute[TRequest,TResponse,TResult](TRequest request, Func`2 execute, Func`2 selector, String selectorCacheKey)
at Microsoft.Xrm.Client.Services.CachedOrganizationService.Execute[T](Request request, Func`2 selector, String selectorCacheKey)
at Microsoft.Xrm.Client.Services.CachedOrganizationService.RetrieveMultiple(QueryBase query)
at Microsoft.Xrm.Client.Services.IOrganizationServiceExtensions.Using[T](Func`1 create, Func`2 action)
at Microsoft.Xrm.Client.Linq.CrmQueryProvider.Execute[TElement](QueryExpression qe, LambdaExpression projection, Delegate postMethodCall, LambdaExpression filter, Type entityType)
at Microsoft.Xrm.Client.Linq.CrmQueryProvider.Execute[TElement](Expression expression)
at Microsoft.Xrm.Client.Linq.QueryProvider.System.Linq.IQueryProvider.Execute[TResult](Expression expression)
at System.Linq.Queryable.Single[TSource](IQueryable`1 source)
at FrontOfficeApp.Controllers.BillingController.GetBillingInstitutions(Requisition req)
at FrontOfficeApp.Controllers.BillingController.InstitutionalBillPartial(Int32 requisitionId)
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.ControllerActionInvoker.<>c__DisplayClassd.<InvokeActionMethodWithFilters>b__a()
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters)
at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
at System.Web.Mvc.Controller.ExecuteCore()
at System.Web.Mvc.MvcHandler.<>c__DisplayClass8.<BeginProcessRequest>b__4()
at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass1.<MakeVoidDelegate>b__0()
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Message=Access to the path 'appDomain=/LM/W3SVC/1/ROOT-1-119328537521157948:key=Microsoft.Xrm.Client.Services.InMemoryCrmCacheProvider:Crm:Query=913126368' is denied.
Data=System.Collections.ListDictionaryInternal

下面是我正在使用的上下文配置。我在这个问题上加了一个悬赏，作为最后的尝试

<microsoft.xrm.client>
    <contexts default="Crm">
        <add name="Crm" type="CRM.XrmDataContext" serviceName="Default" />
    </contexts>
    <services default="Default">
        <add name="Default" cacheProviderName="Default" />
    </services>
    <cache defaultProvider="Default">
        <providers>
            <add name="Default"
               type="Microsoft.Xrm.Client.Caching.InMemoryCacheProvider, Microsoft.Xrm.Client" duration="00:00:01" />
        </providers>
    </cache>
</microsoft.xrm.client>

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我无法想象异常实际上与缓存绑定。删除调用

只是猜测一下，但是异常是否可能与CacheItemRemovedCallback有关，而不是实际的删除步骤（不确定回调是否在同一线程上同步执行）

---

您能发布异常的完整堆栈跟踪吗？

我们终于找到了这个问题的答案。这个问题与模拟（我们在web.config中打开了它）以及我们使用单例访问XRM这一事实有关。显然，当多个用户试图通过我们的软件同时运行CRM查询时，singleton会在他们的用户上下文下连接到CRM。显然，当这种情况发生时，查询结果的缓存由该用户上下文“拥有”。当另一个用户同时尝试运行查询时，他们将收到401状态代码

最终的解决办法是转向模拟并进行一些小的重构，这样我们就不再需要它了。我想我们可以改为允许多个CRM实例——尽管出于性能原因我们故意不这样做

我希望这能帮助其他可能看到这些古怪错误的人

<microsoft.xrm.client>
    <contexts default="Crm">
        <add name="Crm" type="CRM.XrmDataContext" serviceName="Default" />
    </contexts>
    <services default="Default">
        <add name="Default" cacheProviderName="Default" />
    </services>
    <cache defaultProvider="Default">
        <providers>
            <add name="Default"
               type="Microsoft.Xrm.Client.Caching.InMemoryCacheProvider, Microsoft.Xrm.Client" duration="00:00:01" />
        </providers>
    </cache>
</microsoft.xrm.client>