//设置鼠标长时间无操作计时器
private System.Timers.Timer MouseTimerTick = new System.Timers.Timer(10000);

private void Window_Activated(object sender, EventArgs e)
{
　　this.Dispatcher.Invoke(new Action(() =>
　　{
　　　　//显示
　　}));
　　MouseTimerTick.Stop();
}

private void Window_Deactivated(object sender, EventArgs e)
{
　　MouseTimerTick.Start();
}

private void Window_Loaded(object sender, RoutedEventArgs e)
{
　　MouseTimerTick.Elapsed += new System.Timers.ElapsedEventHandler(TimerTick);
　　MouseTimerTick.AutoReset = true;
　　MouseTimerTick.Enabled = true;
}
private void TimerTick(object source, System.Timers.ElapsedEventArgs e)
{
　　this.Dispatcher.Invoke(new Action(() =>
　　{
　　　　//隐藏
　　}));
}

WPF：鼠标长时间无操作，窗口隐藏