using System;

using System.Threading;

using System.Threading.Tasks;

using Microsoft.Extensions.Configuration;

using Microsoft.Extensions.Hosting;

using Microsoft.Extensions.Logging;

using NCrontab;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

public class MyTestHostedService : BackgroundService

{

    private CrontabSchedule _schedule;

    private DateTime _nextRun;

​

    private  string Schedule => "*/10 * * * * *"; //Runs every 10 seconds

​

    public MyTestHostedService()

    {

        _schedule = CrontabSchedule.Parse(Schedule,new CrontabSchedule.ParseOptions { IncludingSeconds = true });

        _nextRun = _schedule.GetNextOccurrence(DateTime.Now);

    }

​

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)

    {

        do

        {

            var now = DateTime.Now;

            var nextrun = _schedule.GetNextOccurrence(now);

            if (now > _nextRun)

            {

                 Process();

                _nextRun = _schedule.GetNextOccurrence(DateTime.Now);

            }

            await Task.Delay(5000, stoppingToken); //5 seconds delay

        }

        while (!stoppingToken.IsCancellationRequested);

    }

​

    private void Process()

    {

        Console.WriteLine("hello world"+ DateTime.Now.ToString("F"));

    }

}