WPF中实现鼠标、键盘不输入时锁定

    public static class HxTimer
    {
        static System.Windows.Threading.DispatcherTimer _LockSreenTimer = new System.Windows.Threading.DispatcherTimer();

        public static System.Windows.Threading.DispatcherTimer LockSreenTimer
        {
            get { return _LockSreenTimer; }
            set { _LockSreenTimer = value; }
        }

        /// <summary>
        /// 锁屏倒计时秒
        /// </summary>
        public static int IdleMinute;
    }

    public class GetLastInputInfoHelp
    {
        [DllImport("user32.dll")]
        internal static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);

        /// <summary>
        /// 获取鼠标键盘不活动的时间
        /// </summary>
        /// <returns>结果</returns>
        public static int GetLastInputTime()
        {
            LASTINPUTINFO lastInputInfo = new LASTINPUTINFO();
            lastInputInfo.cbSize = Marshal.SizeOf(lastInputInfo);
            lastInputInfo.dwTime = 0;

            int idleTime = 0;
            if (GetLastInputInfo(ref lastInputInfo))
            {
                idleTime = Environment.TickCount - lastInputInfo.dwTime;
            }

            return ((idleTime > 0) ? (idleTime / 1000) : 0);
        }

    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct LASTINPUTINFO
    {
        [MarshalAs(UnmanagedType.U4)]
        public int cbSize;
        [MarshalAs(UnmanagedType.U4)]
        public int dwTime;
    }