WPF应用程序关闭时自动退出线程

Question

我有一个主WPF窗口,其中一个控件是我创建的用户控件.此用户控件是模拟时钟,包含更新时针,分针和秒针的线程.最初它不是一个线程,它是一个更新小时,分钟和秒的计时器事件,但我已将其更改为线程,因为当用户按下开始按钮然后时钟不会时应用程序做了一些努力工作更新,所以我把它改成了一个线程.

WPF窗口的代码片段:

     <Window
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        
xmlns:local="clr-namespace:GParts"
       xmlns:Microsoft_Windows_Themes="clr-namespace:Microsoft.Windows.Themes
       assembly=PresentationFramework.Aero"            
       xmlns:UC="clr-namespace:GParts.UserControls"
       x:Class="GParts.WinMain"
       Title="GParts"    
       WindowState="Maximized"
       Closing="Window_Closing"    
       Icon="/Resources/Calendar-clock.png"
       x:Name="WMain"
     >
     <...>
          <!-- this is my user control -->
          <UC:AnalogClock Grid.Row="1" x:Name="AnalogClock" Background="Transparent"
           Margin="0" Height="Auto" Width="Auto"/>
     <...>
     </Window>

我的问题是,当用户退出应用程序时,线程似乎继续执行.我希望线程在主窗口关闭时自动完成.

用户控件构造函数的代码片段:

namespace GParts.UserControls
{
/// <summary>
/// Lógica de interacción para AnalogClock.xaml
/// </summary>
public partial class AnalogClock : UserControl
{
    System.Timers.Timer timer = new System.Timers.Timer(1000);

    public AnalogClock()
    {
        InitializeComponent();

        MDCalendar mdCalendar = new MDCalendar();
        DateTime date = DateTime.Now;
        TimeZone time = TimeZone.CurrentTimeZone;
        TimeSpan difference = time.GetUtcOffset(date);
        uint currentTime = mdCalendar.Time() + (uint)difference.TotalSeconds;

        christianityCalendar.Content = mdCalendar.Date("d/e/Z", currentTime, false);

        // this was before implementing thread
        //timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
        //timer.Enabled = true;

        // The Work to perform 
        ThreadStart start = delegate()
        {

            // With this condition the thread exits when main window closes but
            // despite of this it seems like the thread continues executing after
            // exiting application because in task manager cpu is very  busy
            // 
            while ((this.IsInitialized) && 
                   (this.Dispatcher.HasShutdownFinished== false))
           {

            this.Dispatcher.Invoke(DispatcherPriority.Normal, (Action)(() =>
            {
                DateTime hora = DateTime.Now;

                secondHand.Angle = hora.Second * 6;
                minuteHand.Angle = hora.Minute * 6;
                hourHand.Angle = (hora.Hour * 30) + (hora.Minute * 0.5);

                DigitalClock.CurrentTime = hora;
            }));
        }
            Console.Write("Quit ok");
        };

        // Create the thread and kick it started!
        new Thread(start).Start();
    }

    // this was before implementing thread
    void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
    {

        this.Dispatcher.Invoke(DispatcherPriority.Normal, (Action)(() =>
        {
            DateTime hora = DateTime.Now;

            secondHand.Angle = hora.Second * 6;
            minuteHand.Angle = hora.Minute * 6;
            hourHand.Angle = (hora.Hour * 30) + (hora.Minute * 0.5);

            DigitalClock.CurrentTime = hora;
        }));
    }
 } // end class
 } // end namespace

当主窗口关闭然后应用程序退出时,如何自动退出线程？

Answer 1

只需将Thread 的IsBackground属性设置为true,这样就不会阻止进程终止.

Thread t = new Thread(...) { IsBackground = true };