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我正在开发一个 Windows Phone 应用程序，它可以随时间更新磁贴的HH:mm:ss格式。我已经使用 PeriodicTask 进行了测试，它在调试条件下更新磁贴 30 分钟和 30 秒。所以，我发现 ResourceIntensiveTask 对我来说似乎很有用，当满足某些条件时，它们会尽快更新（我从http://jesseliberty.com/2011/10/05/background-agents/获得了这些知识），所以我有在 ScheduledAgent.cs 中编程如下

protected override void OnInvoke(ScheduledTask task)
{                
    StandardTileData data = new StandardTileData
    {
        Title = DateTime.Now.ToString("hh:mm:ss"),
        //BackgroundImage = new Uri("/Background.png", UriKind.RelativeOrAbsolute)
    };

    ShellTile.ActiveTiles.First().Update(data);      
#if DEBUG_AGENT     
    ScheduledActionService.LaunchForTest(task.Name, TimeSpan.FromMilliseconds(1));
#endif
    NotifyComplete();      
}

和 MainPage.xaml.cs 作为

public MainPage()
{
    InitializeComponent();
    agentsAreEnabled = true;

    periodicTask = ScheduledActionService.Find(periodicTaskName) as ResourceIntensiveTask;

    if (periodicTask != null)
    {
        RemoveAgent(periodicTaskName);
    }

    periodicTask = new ResourceIntensiveTask(periodicTaskName);
    periodicTask.Description = "This checks for audio jack plugged in task.";

    try
    {
        ScheduledActionService.Add(periodicTask);
#if(DEBUG_AGENT)
        // If debugging is enabled, use LaunchForTest to launch the agent in one minute.
        ScheduledActionService.LaunchForTest(periodicTaskName, TimeSpan.FromMilliseconds(1));
#endif
    }
    catch (InvalidOperationException exception)
    {
        if (exception.Message.Contains("BNS Error: The action is disabled"))
        {
            MessageBox.Show("Background agents for this application have been disabled by the user.");
            agentsAreEnabled = false;
        }

        if (exception.Message.Contains("BNS Error: The maximum number of ScheduledActions of this type have already been added."))
        {
            // No user action required. The system prompts the user when the hard limit of periodic tasks has been reached.

        }

    }
    catch (SchedulerServiceException)
    {
        // No user action required.  
    }
}

请注意，我正在使用TimeSpan.FromMilliseconds(1)而不是TimeSpan.FromSeconds(30)在代码的任何位置显示时间，现在当我运行应用程序并固定磁贴时，它会立即以 HH:mm:ss 格式显示时间，但不会更新。这里可能是什么问题。我在正确的轨道上吗。

请记住，我的设备满足运行 ResourceIntensiveTask 的所有条件，我也从这里指的是他们提到的ScheduledActionService.LaunchForTest(taskName, TimeSpan.FromMilliseconds(10));

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