C# 多线程 11-更多信息 01-在通用 Windows 平台应用中使用计时器

🏷️ 《C# 多线程》

本例需要 Win10 系统，并且开启开发者模式。

示例代码

/// <summary>
/// 可用于自身或导航至 Frame 内部的空白页。
/// </summary>
public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();
        // 初始化计时器
        _timer = new DispatcherTimer();
        _ticks = 0;
    }

    private readonly DispatcherTimer _timer;
    private int _ticks;

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        base.OnNavigatedTo(e);
        Grid.Children.Clear();

        var commonPanel = new StackPanel
        {
            Orientation = Orientation.Vertical,
            HorizontalAlignment = HorizontalAlignment.Center
        };

        var buttonPanel = new StackPanel
        {
            Orientation = Orientation.Horizontal,
            HorizontalAlignment = HorizontalAlignment.Center
        };

        var textBlock = new TextBlock
        {
            Text = "Sample timer application",
            FontSize = 32,
            HorizontalAlignment = HorizontalAlignment.Center,
            Margin = new Thickness(40)
        };

        var timerTextBlock = new TextBlock
        {
            Text = "0",
            FontSize = 32,
            HorizontalAlignment = HorizontalAlignment.Center,
            Margin = new Thickness(40)
        };

        var timerStateTextBlock = new TextBlock
        {
            Text = "Timer is enabled",
            FontSize = 32,
            HorizontalAlignment = HorizontalAlignment.Center,
            Margin = new Thickness(40)
        };

        var startButton = new Button { Content = "Start", FontSize = 32 };
        var stopButton = new Button { Content = "Stop", FontSize = 32 };

        buttonPanel.Children.Add(startButton);
        buttonPanel.Children.Add(stopButton);

        commonPanel.Children.Add(textBlock);
        commonPanel.Children.Add(timerTextBlock);
        commonPanel.Children.Add(timerStateTextBlock);
        commonPanel.Children.Add(buttonPanel);

        // 设置间隔时间为 1s
        _timer.Interval = TimeSpan.FromSeconds(1);
        // 设置每个计时器间隔事件
        _timer.Tick += (sender, eventArgs) =>
        {
            timerTextBlock.Text = _ticks.ToString();
            _ticks++;
        };
        // 启动计时器
        _timer.Start();

        startButton.Click += (sender, eventArgs) =>
        {
            timerTextBlock.Text = "0";
            // 启动计时器
            _timer.Start();
            // 重置计数
            _ticks = 1;
            timerStateTextBlock.Text = "Timer is enabled";
        };

        stopButton.Click += (sender, eventArgs) =>
        {
            // 停止计时器
            _timer.Stop();
            timerStateTextBlock.Text = "Timer is disabled.";
        };

        Grid.Children.Add(commonPanel);
    }
}