Windows Idle Time ermitteln

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 public static class IdleTimeDetector
    {
        [DllImport("user32.dll")]
        static extern bool GetLastInputInfo(out LastInputInfo plii);

        [StructLayout(LayoutKind.Sequential)]
        struct LastInputInfo
        {
            public static readonly int SizeOf = Marshal.SizeOf(typeof(LastInputInfo));
            [MarshalAs(UnmanagedType.U4)]
            public int cbSize;
            [MarshalAs(UnmanagedType.U4)]
            public int dwTime;
        }

        public static TimeSpan IdleSince
        {
            get
            {
                int idleTime = 0;
                LastInputInfo lastInputInfo = new LastInputInfo();
                lastInputInfo.cbSize = Marshal.SizeOf(lastInputInfo);
                lastInputInfo.dwTime = 0;

                if (GetLastInputInfo(out lastInputInfo))
                {
                    idleTime = Environment.TickCount - lastInputInfo.dwTime;
                }

                return TimeSpan.FromMilliseconds(idleTime);
            }
        }
    }