C#獲取鍵盤和鼠標操作的時間的類

///

        /// <summary>
        /// 抓獲的時間
        /// </summary>
        [MarshalAs(UnmanagedType.U4)]
        public uint dwTime;
    }

    [DllImport("user32.dll")]
    private static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);
    /// <summary>
    /// 獲取鍵盤和鼠標沒有操作的時間
    /// </summary>
    /// <returns>用戶上次使用系統到現在的時間間隔，單位為秒</returns>
    public static long GetLastInputTime()
    {
        LASTINPUTINFO vLastInputInfo = new LASTINPUTINFO();
        vLastInputInfo.cbSize = Marshal.SizeOf(vLastInputInfo);
        if (!GetLastInputInfo(ref vLastInputInfo))
        {
            return 0;
        }
        else
        {
            long count = Environment.TickCount - (long)vLastInputInfo.dwTime;
            //long icount = count / 1000;
            return count;
        }
    }

private void timer1_Tick(object sender, EventArgs e)
{
int sunNumber=int.Parse(GetLastInputTime().ToString());
if (sunNumber >= 30000)
{
this.Close();
}

    }