TarifasANEEL/Utilities/TimerHelper.cs

using System.Timers;

namespace TarifasANEEL.Utilities
{
    public static class TimerHelper
    {
        static DateTime dtTimerEndTime;
        static void SetTimerEndTime(DateTime date) => dtTimerEndTime = date;
        static void WhileTimerRuns(object sender, ElapsedEventArgs e)
        {
            Console.Write($"\rEncerrando em {dtTimerEndTime.Subtract(e.SignalTime).Seconds}");
        }
        public static void SetTimer(int durationInSeconds)
        {
            var vTimer = new System.Timers.Timer(100);
            double dRemainingTime;
            SetTimerEndTime(DateTime.Now.AddSeconds(durationInSeconds));
            vTimer.Elapsed += WhileTimerRuns!;
            vTimer.AutoReset = true;
            vTimer.Enabled = true;

            Console.WriteLine("");
            Console.WriteLine("Pressione qualquer tecla para encerrar o programa...");
            Console.WriteLine("");

            Task.Factory.StartNew(
                () =>
                {
                    Console.ReadKey();
                    dRemainingTime = DateTime.Now.Subtract(dtTimerEndTime).TotalSeconds;
                }
            ).Wait(
                TimeSpan.FromSeconds(durationInSeconds)
            );
        }

        private static void OnTimedEvent(object? source, ElapsedEventArgs e)
        {
            Console.WriteLine("Encerrando o aplicativo.");
            Environment.Exit(0);
        }
    }
}