捕获屏幕保护程序事件的问题

Question

我正在尝试捕获屏幕保护程序事件，但是当我运行我的应用程序并进行个性化＆gt;屏幕保护程序＆gt;预览并打开屏幕保护程序，nlog不会写入日志，就好像事件没有被拿起一样！

代码在

之下

[DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int SystemParametersInfo(int uAction, int uParam, ref int ipvParam, int fuWinini);

        const int SPI_GETSCREENSAVERRUNNING = 114;
        static int screenSaverRunning = -1;
        int ok = SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0, ref screenSaverRunning, 0);

        private void ScreenSaver()
        {
            if (ok == 0)
            {
                Logger.Trace("SCREENSAVER OFF");
            }

            if (screenSaverRunning != 0)
            {
                Logger.Trace("SCREENSAVER ON");

            }
    }