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        void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            SetLabelButtonStatus(IndexerCurrentFileLabel, "检索进行中 ....");

            IKnownFolder docs;

            if (ShellLibrary.IsPlatformSupported)
                docs = KnownFolders.DocumentsLibrary;
            else
                docs = KnownFolders.Documents;

            ShellContainer docsContainer = docs as ShellContainer;

            foreach (ShellObject so in docs)
            {
                RecurseDisplay(so);

                if (backgroundWorker.CancellationPending)
                {
                    SetLabelButtonStatus(StartStopIndexerButton, "开始检索");
                    SetLabelButtonStatus(IndexerStatusLabel, "点击开始寻找按钮继续开始寻找.");
                    SetLabelButtonStatus(IndexerCurrentFileLabel, (cancelReason == "电源改变") ?
                                "因为电源放弃检索" :
                                "因为使用者放弃检索");

                    return;
                }

                Thread.Sleep(1000); // 休眠1秒，以指示该文件的索引
            }
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            CapturePowerManagementEvents();
            GetPowerSettings();
        }
//获取从PowerManager的当前属性值。
        //此方法是在启动时调用。
        private void GetPowerSettings()
        {
            settings.PowerPersonality = PowerManager.PowerPersonality.ToString();
            settings.PowerSource = PowerManager.PowerSource.ToString();
            settings.BatteryPresent = PowerManager.IsBatteryPresent;
            settings.UpsPresent = PowerManager.IsUpsPresent;
            settings.MonitorOn = PowerManager.IsMonitorOn;
            settings.MonitorRequired = PowerManager.MonitorRequired;

            if (PowerManager.IsBatteryPresent)
            {
                settings.BatteryShortTerm = PowerManager.IsBatteryShortTerm;
                settings.BatteryLifePercent = PowerManager.BatteryLifePercent;

                BatteryState batteryState = PowerManager.GetCurrentBatteryState();

                string batteryStateStr = string.Format(
                "ACOnline: {1}{0}最大充电: {2} mWh{0}兆瓦时电流充电: {3} mWh{0}兆瓦时放电率: {4} {0}估计剩余时间: {5}{0}建议临界电池更换: {6} mWh{0}建议兆瓦电池充电警告: {7} mWh{0}",
                Environment.NewLine,
                batteryState.ACOnline,
                batteryState.MaxCharge,
                batteryState.CurrentCharge,
                batteryState.ACOnline == true ? "N/A" : batteryState.DischargeRate.ToString() + " mWh",
                batteryState.ACOnline == true ? "N/A" : batteryState.EstimatedTimeRemaining.ToString(),
                batteryState.SuggestedCriticalBatteryCharge,
                batteryState.SuggestedBatteryWarningCharge
                );

                settings.BatteryState = batteryStateStr;
            }
        }

        // 增加了对PowerManager的事件的事件处理程序。
        private void CapturePowerManagementEvents()
        {
            PowerManager.IsMonitorOnChanged += new EventHandler(MonitorOnChanged);
            PowerManager.PowerPersonalityChanged += new EventHandler(
                PowerPersonalityChanged);
            PowerManager.PowerSourceChanged += new EventHandler(PowerSourceChanged);
            if (PowerManager.IsBatteryPresent)
            {
                PowerManager.BatteryLifePercentChanged += new EventHandler(BatteryLifePercentChanged);


                SetLabelButtonStatus(batteryLifePercentLabel, string.Format("{0}%", PowerManager.BatteryLifePercent.ToString()));
            }

            PowerManager.SystemBusyChanged += new EventHandler(SystemBusyChanged);
        }

        // PowerManager的事件处理程序。

        void MonitorOnChanged(object sender, EventArgs e)
        {
            settings.MonitorOn = PowerManager.IsMonitorOn;
            AddEventMessage(string.Format("显示器状态改变 (new status: {0})", PowerManager.IsMonitorOn ? "On" : "Off"));
        }

        void PowerPersonalityChanged(object sender, EventArgs e)
        {
            settings.PowerPersonality = PowerManager.PowerPersonality.ToString();
            AddEventMessage(string.Format("电源变化(current setting: {0})", PowerManager.PowerPersonality.ToString()));
        }

        void PowerSourceChanged(object sender, EventArgs e)
        {
            settings.PowerSource = PowerManager.PowerSource.ToString();
            AddEventMessage(string.Format("电源设置变化 (current source: {0})", PowerManager.PowerSource.ToString()));

            //
            if (backgroundWorker.IsBusy)
            {
                if (PowerManager.PowerSource == PowerSource.Battery)
                {

                    cancelReason = "电源变化";
                    backgroundWorker.CancelAsync();
                }

            }
            else
            {
                if (PowerManager.PowerSource == PowerSource.AC || PowerManager.PowerSource == PowerSource.Ups)
                {
                    SetLabelButtonStatus(IndexerStatusLabel, "点击开始寻找按钮继续开始寻找.");
                }
            }
        }

        void BatteryLifePercentChanged(object sender, EventArgs e)
        {
            settings.BatteryLifePercent = PowerManager.BatteryLifePercent;
            AddEventMessage(string.Format("电源电量变化了 (new value: {0})", PowerManager.BatteryLifePercent));

            // 设置剩余电源电量
            SetLabelButtonStatus(batteryLifePercentLabel, string.Format("{0}%", PowerManager.BatteryLifePercent.ToString()));
        }

       //事件处理程序必须使用窗口的调度
        //更新用户界面直接。这是必要的，因为
        //事件处理程序被调用在非UI线程。
        void SystemBusyChanged(object sender, EventArgs e)
        {
            AddEventMessage(string.Format("系统忙碌变化 at {0}", DateTime.Now.ToLongTimeString()));
        }

        void AddEventMessage(string message)
        {
            this.Dispatcher.Invoke(DispatcherPriority.Normal,
                (Window1.MethodInvoker)delegate
                {
                    ListBoxItem lbi = new ListBoxItem();
                    lbi.Content = message;
                    messagesListBox.Items.Add(lbi);
                    messagesListBox.ScrollIntoView(lbi);
                });
        }

        private void StartIndexer(object sender, RoutedEventArgs e)
        {
            if (backgroundWorker.IsBusy && ((Button)sender).Content.ToString() == "停止索引")
            {
                cancelReason = "userCancelled";
                backgroundWorker.CancelAsync();
                SetLabelButtonStatus(IndexerStatusLabel, "点击按钮开始寻找");
                return;
            }

            //如果运行在使用电池，不启动索引
            if (PowerManager.PowerSource != PowerSource.Battery)
            {
                backgroundWorker.RunWorkerAsync();
                SetLabelButtonStatus(IndexerStatusLabel, "索引进行中....");
                SetLabelButtonStatus(StartStopIndexerButton, "停止索引");
            }
            else
            {
                SetLabelButtonStatus(IndexerCurrentFileLabel, "电池上运行。没有启动的索引");
            }
        }

        private void RecurseDisplay(ShellObject so)
        {
            if (backgroundWorker.CancellationPending)
                return;

            SetLabelButtonStatus(IndexerCurrentFileLabel,
                string.Format("Current {0}: {1}", so is ShellContainer ? "文件夹" : "文件", so.ParsingName));

            // 通过此对象的子项，如果它是一个对象容器
            ShellContainer container = so as ShellContainer;

            if (container != null)
            {
                foreach (ShellObject child in container)
                    RecurseDisplay(child);
            }
        }

        private void SetLabelButtonStatus(ContentControl control, string status)
        {
            this.Dispatcher.Invoke(DispatcherPriority.Normal,
                (Window1.MethodInvoker)delegate
                {
                    control.Content = status;
                });
        }
    }
}

编译运行，见效果：

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