PM>Install-Package Quartz 

using Quartz;
using Quartz.Impl;
using System;

namespace QuartzTest
{
    class Program
    {
        static void Main(string[] args)
        {
            // First we must get a reference to a scheduler
            ISchedulerFactory sf = new StdSchedulerFactory();
            IScheduler sched = sf.GetScheduler();
            IJobDetail job = JobBuilder.Create<HelloJob>()
              .WithIdentity("job1", "group21")
              .Build();

            //什么时候开始执行
            DateTime runTime = DateTime.Now;
            ITrigger trigger = TriggerBuilder.Create()
            .WithIdentity("trigger1", "group1")
            .StartAt(runTime)
            .WithSimpleSchedule(x => x         
            .WithIntervalInSeconds(1) //1秒一次真男人
            .RepeatForever())//无限循环
            .Build();

            sched.ScheduleJob(job, trigger);
            //启动任务
            sched.Start();
           
        }
    }
}

using Quartz;
using System;
using System.Threading.Tasks;
namespace QuartzTest
{
    /// <summary>
    /// This is just a simple job that says "Hello" to the world.
    /// </summary>
    /// <author>Bill Kratzer</author>
    /// <author>Marko Lahma (.NET)</author>
    public class HelloJob : IJob
    {
        /// <summary> 
        /// Called by the <see cref="IScheduler" /> when a
        /// <see cref="ITrigger" /> fires that is associated with
        /// the <see cref="IJob" />.
        /// </summary>
        public  void Execute(IJobExecutionContext context)
        {
            Console.WriteLine("Hello Quartz");
            // Say Hello to the World and display the date/time
        }
    }
}

            ITrigger trigger2 = TriggerBuilder.Create()
                                       .WithIdentity("trigger2", "group1")
                                       .StartAt(runTime)
                                       .WithCronSchedule("/1 * * ? * *")    //时间表达式，1秒一次     
                                       .Build();
            sched.ScheduleJob(job, trigger2);