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   源码介绍

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编程实现关闭显示器，通过API关闭显示器。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace TurnOffMonitor
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        private const uint WM_SYSCOMMAND = 0x0112;
        private const uint SC_MONITORPOWER = 0xF170;

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

        [DllImport("user32.dll")]
        public static extern IntPtr SendMessage(IntPtr hWnd, uint msg, uint wParam, int lParam);

        public MainWindow()
        {
            InitializeComponent();
        }

        private void BtnTurnOffMonitor_Click(object sender, RoutedEventArgs e)
        {
            IsDisplay(false);
        }

        /// <summary>
        /// 是否打开显示器
        /// </summary>
        /// <param name="isDisplay"></param>
        public void IsDisplay(bool isDisplay)
        {
            if (isDisplay)
            {
                SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, -1); //打开显示器;
            }
            else
            {
                SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, 2); //关闭显示器;
            }
        }
    }
}