/// <summary>
        /// 获取单例对象的方法
        /// </summary>
        /// <returns></returns>
        public static TaskTomatoService GetTaskTomatoService()
        {
            if (uniqueTaskTomatoService != null)
            {
                return(uniqueTaskTomatoService);
            }

            lock (locker)
            {
                uniqueTaskTomatoService = new TaskTomatoService();
                using (var context = uniqueTaskTomatoService.Context)
                {
                    context.Database.EnsureCreated();
                }
            }
            return(uniqueTaskTomatoService);
        }
 /// <summary>
 /// 释放单例对象
 /// </summary>
 public static void Dispose()
 {
     uniqueTaskTomatoService = null;
 }