未链接到UI的UWP App中的计时器 [英] Timer in UWP App which isn't linked to the UI

问题描述

我正在研究UWP MVVM项目，如果用户交互在特定时间内停止，我想实现一个自动注销系统。

到目前为止，我使用的是 DispatcherTimer 从每秒200开始倒数​​。

I'm working on an UWP MVVM project and would like to implement an automatic logout system if the user interaction stops for a specific time.
Until now I'm using a DispatcherTimer to count backwards from 200 every second.

TimerLeave = 200;
var _dispatcherTimer = new DispatcherTimer();
_dispatcherTimer.Tick += dispatcherTimer_Tick;
_dispatcherTimer.Interval = new TimeSpan(0, 0, 1);

_dispatcherTimer.Start();

但是由于DispatcherTimer与UI链接了
，因此我正在构建MVVM应用程序，我正在寻找替代方法。

我进行了一些搜索，发现在计时器上运行后台任务。问题是
只能将此计时器设置为每15分钟运行一次，对于我而言，这太长了，无法自动注销用户。我找不到减少15分钟的解决方法。

所以我的问题是，是否有可能在未链接到UI且可以设置变量的UWP项目中设置计时器？ / p>

But because the DispatcherTimer is linked with the UI and I'm building a MVVM App, I'm looking for an alternative.
I searched a bit and found Run a background task on a timer. The problem is that this timer can only be set to run every 15 minutes, which is a little too long to automaticly logout a user in my case. I found no workaround to reduce the 15 minutes.
So my question is, is there any possibility to set up a timer in an UWP Project that isn't linked to the UI and can be set variable?

推荐答案

是-例如，您可以使用计时器类-尽管您必须记住它在单独的线程上运行。示例：

Yes - you can for example use Timer class - though you must remember that it run on separate thread. Example:

private Timer timer;
public MainPage()
{        
    this.InitializeComponent();
    timer = new Timer(timerCallback, null, (int)TimeSpan.FromMinutes(1).TotalMilliseconds, Timeout.Infinite);
}

private async void timerCallback(object state)
{
    // do some work not connected with UI

    await Window.Current.CoreWindow.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal,
        () => {
            // do some work on UI here;
        });
}

请注意，可能不会立即处理在UI调度程序上调度的工作-它

Note that the work dispatched on UI dispatcher may not be processed right away - it depend on dispatcher's workload.

还要记住，此计时器与您的应用程序一起运行，并且在应用程序暂停时将不起作用。

Also remember that this timer runs along with your app and won't work when app is suspended.

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