如何安排重复任务中的Windows Phone 8倒计时一些 [英] How to schedule a repeating task to count down a number in windows phone 8

问题描述

我需要只是，只要用户一个特定的屏幕上运行一个简单的任务。
在此屏幕上有向下定时器计数

I need to just have a simple task that runs as long as the user is on one specific screen. On this screen there is a count down timer.

我看着后台代理 - 但这似乎不是正确的做法。

I looked into Background Agents - but that seems not to be the right approach.

基本上它应该像这样的：用户进入这个屏幕，按下启动和续下来计时器开始倒计时 - 每30秒更新是完全确定

Basically it should work like this: The user goes to this one screen, presses start and the cont down timer starts to count down - every 30 seconds update is perfectly ok.

我应该怎样做这在WP8？
非常感谢！

How should I do this on WP8 ? Many thanks!

推荐答案

作为wkempf指出您应该使用DispatcherTimer。很简单，实际创建。像这样的东西（你有一个在你的XAML命名countText TextBlock的：

You should use a DispatcherTimer as wkempf points out. Pretty simple to create actually. Something like this (where you have a TextBlock named countText in your xaml:

public partial class MainPage : PhoneApplicationPage
{
    private DispatcherTimer _timer;
    private int _countdown;

    // Constructor
    public MainPage()
    {
        InitializeComponent();

        _countdown = 100;
        _timer = new DispatcherTimer();
        _timer.Interval = TimeSpan.FromSeconds(1);
        _timer.Tick += (s, e) => Tick();
        _timer.Start();
    }

    private void Tick()
    {
        _countdown--;

        if (_countdown == 0)
        {
            _timer.Stop();
        }

        countText.Text = _countdown.ToString();
    }
}

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