private async Task Init()
        {
            if (CurrentManager == null)
            {
                CurrentManager       = new UrlContentChangeCheckerManager();
                MainList.ItemsSource = CurrentManager.UrlContentCheckerList;
            }
            await Task.Delay(10);

            await CurrentManager.Init();

            return;
        }
        public async void Run(IBackgroundTaskInstance taskInstance)
        {
            SaveLog();
            //ToastsDef.SendNotification_TwoString("后台任务执行", "当前时间" + DateTime.Now.ToString());
            var deferral = taskInstance.GetDeferral();
            var TaskNow  = new UrlContentChangeCheckerManager();
            await TaskNow.Init();

            var Tasks = TaskNow.CheckAll_NoWait();

            Task.WaitAll(Tasks.ToArray());
            Debug.WriteLine("结束任务");
            //ToastsDef.SendNotification_TwoString("后台任务结束", "当前时间" + DateTime.Now.ToString());

            deferral.Complete();
        }