/// <summary> /// 获取用户的离线消息数 /// </summary> /// <typeparam name="T">返回类型</typeparam> /// <param name="userName">用户名</param> /// <returns></returns> public T GetOfflineMsgCount <T>(string userName) { if (_instance == null) { return(default(T)); } return(_instance.GetOfflineMsgCount <T>(userName)); }