Program.cs

using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace TDesktop
{
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            var name = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\TeacherDesktop", true)?.GetValue("App").ToString();
            if (name != null)
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new MainFrom());
            }
            else
            {
                Application.EnableVisualStyles();
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new Firstuse_boot());
            }
        }
    }
}