Windows锁定屏幕然后关闭显示器，可执行程序

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Text;
namespace LockAndCloseWindow
{
    class Program
    {
            //系统消息
        private const uint WM_SYSCOMMAND=0x112;
        //关闭显示器的系统命令
        private const int SC_MONITORPOWER=0xF170;
        //2为PowerOff, 1为省电状态，-1为开机
        private const int MonitorPowerOff=2;
        //广播消息，所有顶级窗体都会接收
        private static readonly IntPtr WND_BROADCAST = new IntPtr(0xffff);
        static void Main(string[] args)
        {
            LockWorkStation();//锁定屏幕
            System.Threading.Thread.Sleep(10);
            SendMessage(HWND_BROADCAST,
                  WM_SYSCOMMAND,
                  SC_MONITORPOWER,
                  MonitorPowerOff);
            //关闭显示器
        }
        //锁定屏幕
        [DllImport("user32.dll")]
        public static extern bool LockWorkStation();
        //关闭显示器
        [DllImport("user32.dll")]
        private static extern IntPtr SendMessage(
                IntPtr hWnd, 
                uint Msg, 
                int wParam, 
                int lParam);
    }
}