我创建了一个需要处于安全状态的应用程序,因此我想在后台跟踪计算机的电源状态。如果电池电量(如果有的话)很低或很重要,我不会允许用户继续使用该应用程序并正确退出。C# - PowerStatus变化引发事件
首先,我惊讶的发现没有这样的事件来检测变化。您需要始终手动检查PowerStatus。
所以,我创建围绕它的包装,像这样的东西:
using System;
using System.Windows.Forms;
namespace MyApp
{
internal static class BatteryManagement
{
//
internal static event EventHandler<EventArgs> Changed;
//
private static bool _started;
private static System.Threading.Timer _timer;
private static PowerStatus _previousPowerStatus;
internal static void Start()
{
if (!_started)
{
_started = true;
ManageBatteryLevel();
}
}
internal static void Stop()
{
if (_started)
{
if(_timer != null)
{
_timer.Dispose();
_timer = null;
}
_started = false;
}
}
private static void ManageBatteryLevel()
{
_previousPowerStatus = new PowerStatus();
TimeSpan dueTime = new TimeSpan(0, 0, 0); // Start right now
TimeSpan period = new TimeSpan(0, 1, 0); // Run every 1 minute
// Setting a timer that launch every period the OnBatteryLevelChange method
_timer = new System.Threading.Timer(OnBatteryLevelChange, null, dueTime, period);
}
private static void OnBatteryLevelChange(Object stateInfo)
{
PowerStatus powerStatus = new PowerStatus();
if (!_previousPowerStatus.Equals(powerStatus))
{
// Ensure battery level is up to date before raising event
_previousPowerStatus = powerStatus;
if (Changed != null)
{
Changed(null, EventArgs.Empty);
}
}
}
}
}
但不起作用,因为电源状态,还没有任何公开的构造,我不能存储先前的结果状态...
我该如何管理?
谢谢...
这就是我寻找的原因!谢谢:) – 2011-03-21 14:04:42
@Arnaud:没问题;) – w69rdy 2011-03-21 14:09:41