AggregateException
   在 System.Threading.CancellationTokenSource.ExecuteCallbackHandlers(Boolean throwOnFirstException)
   在 System.Threading.CancellationTokenSource.NotifyCancellation(Boolean throwOnFirstException)
   在 System.Threading.CancellationTokenSource.TimerCallbackLogic(Object obj)
   在 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   在 System.Threading.TimerQueueTimer.CallCallback()
   在 System.Threading.TimerQueueTimer.Fire()
   在 System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   在 System.Threading.ThreadPoolWorkQueue.Dispatch()

OutOfMemoryException
引发类型为“System.OutOfMemoryException”的异常。
   在 System.Threading.CancellationCallbackInfo.ExecuteCallback()
   在 System.Threading.CancellationTokenSource.ExecuteCallbackHandlers(Boolean throwOnFirstException)