我正在使用 NHibernate 和 Velocity 作为第二个缓存级别提供程序。
我需要清除一个区域。我正在使用这段代码：
_sessionFactory.EvictQueries("Authorization");
var authCache = _sessionFactory.GetSecondLevelCacheRegion("Authorization");
authCache.Clear();
authCache.Clear() 实际上是调用 NHibernate.Caches.Velocity.VelocityClient.Cache 方法。
该区域已正确清除。但在那之后，会打开一个新会话，并对先前缓存的实体进行查询。它尝试在 VelocityClient 中获取并锁定。砰。AppFabricCachingService 崩溃（请参阅下面的事件日志）
我是否正确清除缓存？我的错误是什么？
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事件簿
AppFabric Caching service crashed with exception {System.Runtime.CallbackException: Async Callback threw an exception. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.GetPlaceHolderObject(Object key)
at Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.PreProcess(MDHObjectNode oldObjectNode, MDHObjectNode& newObjectNode, MDHOperationInfo& operationInfo)
at Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.PutNodeInSlot(MDHOperationInfo& operationInfo, MDHDirectoryNode dir, Int32 slotIndex)
at Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.TryOperation(MDHOperationInfo& operationInfo)
at Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.PerformOperation(MDHOperationInfo& operationInfo)
at Microsoft.ApplicationServer.Caching.MultiDirectoryHashtable.GetAndLock(Object key, TimeSpan lockTimeOut, Boolean lockKey, DMOperationCallBack preOperation, DMOperationCallBack postOperation, Object opState)
at Microsoft.ApplicationServer.Caching.DMHashContainer.GetAndLock(Object key, TimeSpan lockTimeOut, Boolean lockKey, Object opState)
at Microsoft.ApplicationServer.Caching.ObjectManager.GetAndLock(String cacheName, String regionName, Object key, TimeSpan lockTimeOut, DataCacheLockHandle& lHandle, Boolean lockKey, Object opState)
at Microsoft.ApplicationServer.Caching.VelocityDataStore.ProcessWriteRequest(RequestBody request)
at Microsoft.ApplicationServer.Caching.VelocityDataStore.ProcessMessageRequest(RequestBody request)
at Microsoft.ApplicationServer.Caching.DistributedObjectManager.OnReceiveMessageFromRemoteDRM(IReplyContext replyContext)
at Microsoft.ApplicationServer.Caching.WcfTransportChannel.InvokeCallback(Message message, IChannelContainer container)
at Microsoft.ApplicationServer.Caching.WcfServerChannel.InvokeCallback(Message message, IChannelContainer container)
at Microsoft.ApplicationServer.Caching.WcfServerChannel.CompleteProcessing(IAsyncResult result)
at Microsoft.ApplicationServer.Caching.WcfTransportChannel.Receive(IAsyncResult result)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
--- End of inner exception stack trace ---
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously, Exception exception)
at System.ServiceModel.Channels.SynchronizedMessageSource.ReceiveAsyncResult.OnReceiveComplete(Object state)
at System.ServiceModel.Channels.SessionConnectionReader.OnAsyncReadComplete(Object state)
at System.ServiceModel.Channels.StreamConnection.OnRead(IAsyncResult result)
at System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
at System.Net.LazyAsyncResult.Complete(IntPtr userToken)
at System.Net.LazyAsyncResult.ProtectedInvokeCallback(Object result, IntPtr userToken)
at System.Net.Security.NegotiateStream.ProcessFrameBody(Int32 readBytes, Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.NegotiateStream.ReadCallback(AsyncProtocolRequest asyncRequest)
at System.Net.AsyncProtocolRequest.CompleteRequest(Int32 result)
at System.Net.FixedSizeReader.CheckCompletionBeforeNextRead(Int32 bytes)
at System.Net.FixedSizeReader.ReadCallback(IAsyncResult transportResult)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously)
at System.Runtime.AsyncResult.Complete(Boolean completedSynchronously, Exception exception)
at System.ServiceModel.Channels.ConnectionStream.ReadAsyncResult.OnAsyncReadComplete(Object state)
at System.ServiceModel.Channels.SocketConnection.FinishRead()
at System.ServiceModel.Channels.SocketConnection.AsyncReadCallback(Boolean haveResult, Int32 error, Int32 bytesRead)
at System.ServiceModel.Channels.OverlappedContext.CompleteCallback(UInt32 error, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)}. Check debug log for more information