C#中的定时器启动an.exe

Question

I am trying to make a program that will wait for 8 hours and then

if it's 8am or later - run an.exe and close itself (done)

if it's not 8am yet - wait until 8am and then run.exe and close itself

My code:

namespace Timer
{
    public partial class Timer : Form
    {
        public Timer()
        {
            InitializeComponent();
        }
        TimeSpan eight = new TimeSpan(8, 0, 0);

    private void timer1_Tick(object sender, EventArgs e)
        {
            TimeSpan now = DateTime.Now.TimeOfDay;
            if (now >= eight)
            {
            System.Diagnostics.Process.Start(@"Alarm.exe");
            System.Windows.Forms.Application.Exit();
            }
            else
            {
            // wait until 8am and then:
            System.Diagnostics.Process.Start(@"Alarm.exe");
            System.Windows.Forms.Application.Exit();
            }

It's probably very easy, but I am a complete beginner and I can't figure this out myself:/

Thank you very much for your help.

Answer 1

very low tech approach

var now = DateTime.Now;
var schedule = now.AddHours(8);

if (schedule.TimeOfDay < TimeSpan.FromHours(8))
   schedule = schedule.Date + TimeSpan.FromHours(8);

var timer = new Timer(Callback, null, schedule - now, Timeout.InfiniteTimeSpan)