WPF程序响应系统休眠唤醒消息

using System.Windows;
using Microsoft.Win32;

namespace CatchHibernateMsg
{
    /// <summary>
    /// We will catch system's suspend and resume events by adding handlers in Microsoft.Win32.SystemEvents's static events.
    /// So that when you suspend or resume your computer,it shall show a dialog to inform you.
    /// </summary>
    public partial class MainWindow : Window
    {
        SessionEndedEventHandler seeh;
        PowerModeChangedEventHandler pmceh;

        public MainWindow()
        {
            InitializeComponent();
            addEventsHandlers();
        }

        private void addEventsHandlers()
        {
            this.Closing += new System.ComponentModel.CancelEventHandler(MainWindow_Closing);
            seeh = new SessionEndedEventHandler(SystemEvents_SessionEnded);
            pmceh = new PowerModeChangedEventHandler(SystemEvents_PowerModeChanged);

            SystemEvents.SessionEnded += seeh;
            SystemEvents.PowerModeChanged += pmceh;
        }

        void MainWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
                detachEventHandlers();
        }

        // Since SessionEnded and PowerModeChanged is static events,we will need to detach the events handlers in exiting.
        private void detachEventsHandlers()
        {
            if (pmceh != null) SystemEvents.SessionEnded -= this.seeh;
            if (pmceh != null) SystemEvents.PowerModeChanged -= this.pmceh;
        }
        

        void SystemEvents_PowerModeChanged(object sender, PowerModeChangedEventArgs e)
        {
            if (e.Mode == PowerModes.Suspend)
                pause();
            else if(e.Mode == PowerModes.Resume)
                continu();
        }

        private void pause() { MessageBox.Show("pause"); }

        private void continu() { MessageBox.Show("continue"); }

        void SystemEvents_SessionEnded(object sender, SessionEndedEventArgs e)
        {
            Application.Current.Shutdown(0);
        }
    }
}