InvalidOperationException: 集合已修改; 列舉作業可能尚未執行。
StackTrace:
   於 System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   於 System.Collections.Generic.Dictionary`2.Enumerator.MoveNext()
   於 DynamicClass.WindowTopMostAndBorderManager.MonitorTopMostWindows(Object state)
   於 System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   於 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   於 System.Threading.TimerQueueTimer.CallCallback()
   於 System.Threading.TimerQueueTimer.Fire()
   於 System.Threading.TimerQueue.FireNextTimers()