private static void OnConnectionStateChangedCallback(int id, CONNECTION_STATE state, CONNECTION_CHANGE_REASON reason)
 {
     if (clientEventHandlerHandlerDic.ContainsKey(id) && clientEventHandlerHandlerDic[id].OnConnectionStateChanged != null)
     {
         if (AgoraCallbackObject.GetInstance()._CallbackQueue != null)
         {
             AgoraCallbackObject.GetInstance()._CallbackQueue.EnQueue(() => {
                 if (clientEventHandlerHandlerDic.ContainsKey(id) && clientEventHandlerHandlerDic[id].OnConnectionStateChanged != null)
                 {
                     clientEventHandlerHandlerDic[id].OnConnectionStateChanged(id, state, reason);
                 }
             });
         }
     }
 }