///

/// 创建结构体用于返回捕获时间

///

[StructLayout(LayoutKind.Sequential)]

struct LASTINPUTINFO

{

///

/// 设置结构体块容量

///

[MarshalAs(UnmanagedType.U4)]

public int cbSize;

        /// <summary>

        /// 抓获的时间

        /// </summary>

        [MarshalAs(UnmanagedType.U4)]

        public uint dwTime;

    }

    [DllImport("user32.dll")]

    private static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);

    /// <summary>

    /// 获取键盘和鼠标没有操作的时间

    /// </summary>

    /// <returns>用户上次使用系统到现在的时间间隔，单位为秒</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();

}

    }