TurnoffMonitor/TurnoffMonitorOnLock/MainForm.cs

using Microsoft.Win32;
using System.Threading;
using System.Windows.Forms;
using TurnoffMonitorOnLock.IconExtract;
using TurnoffMonitorOnLock.MonitorPowerApi;

namespace TurnoffMonitorOnLock
{
    public partial class MainForm : Form
    {
        private bool _keepOff = false;

        public MainForm()
        {
            InitializeComponent();
            var eIcon = IconExtractor.GetMainIcon();
            if (null != eIcon)
            {
                Icon = eIcon;
                MinisizeToTray.Icon = eIcon;
            }
            SystemEvents.SessionSwitch += delegate (object o, SessionSwitchEventArgs args)
            {
                if (args.Reason == SessionSwitchReason.SessionLock)
                {
                    Thread.Sleep(1500);
                    MonitorPower.SetMonitorInState(MonitorState.MonitorStateOff);
                    _keepOff = true;
                    new Thread(() =>
                    {
                        while (_keepOff)
                        {
                            Thread.Sleep(1000 * 10);
                            if (!_keepOff) break;
                            MonitorPower.SetMonitorInState(MonitorState.MonitorStateOff);
                        }
                    }).Start();
                }
                else
                {
                    _keepOff = false;
                }
            };
        }

        private void MainForm_Shown(object sender, System.EventArgs e)
        {
            if (Program.CommandLineArgs.Count != 0) WindowState = FormWindowState.Minimized;
        }

        private void MainForm_Resize(object sender, System.EventArgs e)
        {
            if (WindowState != FormWindowState.Minimized) return;
            Hide();
            MinisizeToTray.Visible = true;
            MinisizeToTray.ShowBalloonTip(5000, Text, "Im here", ToolTipIcon.Info);
        }

        private void MinisizeToTray_Click(object sender, System.EventArgs e)
        {
            MinisizeToTray.Visible = false;
            Show();
            WindowState = FormWindowState.Normal;
        }
    }
}