1、使用Win32的API接口 ：SendMessage

2、基于C# 任務(wù)臺代碼如下

class Program

    {

        public const uint WM_SYSCOMMAND = 0x0112;

        public const uint SC_MONITORPOWER = 0xF170;

        [DllImport("user32")]

        public static extern IntPtr SendMessage(IntPtr hWnd, uint wMsg, uint wParam, int lParam);

 

        private static readonly IntPtr HWND_BROADCAST = new IntPtr(0xffff);

 

        static void CloseLCD()

        {

            SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, 2); // 2 為關(guān)閉顯示器， －1則打開顯示器

        }

 

        static void OpenLCD()

        {

            SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, -1); // 2 為關(guān)閉顯示器， －1則打開顯示器

        }

 

        static void Main(string[] args)

        {

            Console.WriteLine("11111111111");

            Thread.Sleep(1000);

            CloseLCD();

            Console.WriteLine("22222222222");

            Thread.Sleep(1000);

            OpenLCD();

            Console.ReadKey();

        }

    }

3、效果如下：

運行黑屏后，按下鍵盤或者鼠標，退出黑屏，重新進行登錄界面，輸入密碼后，正常進入桌面。（若無密密碼，直接進入桌面）

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