通过quartz配置一个任务，比如我设定每小时（整点）执行一次，比如15:28启动，预想结果应该是，在16:00第一次执行，然后类推。结果经常是，15:28就进行了第一次执行，也就是说quartz在启动时不按照预定排程执行了一次。这在实际操作中会带来不小的麻烦。
解决办法：((CronTriggerImpl)trigger).MisfireInstruction = MisfireInstruction.CronTrigger.DoNothing;
_scheduler = await GetSchedulerAsync(); Type type = Type.GetType(scheduleInfo.JobName, true, true); IJobDetail job = JobBuilder.Create(type) .WithIdentity(scheduleInfo.JobName, scheduleInfo.JobGroup) .Build(); ICronTrigger trigger = (ICronTrigger)TriggerBuilder.Create() .StartAt(startRunTime) .EndAt(endRunTime) .WithIdentity(scheduleInfo.JobName, scheduleInfo.JobGroup) .WithCronSchedule(scheduleInfo.CronExpress) .Build(); ((CronTriggerImpl)trigger).MisfireInstruction = MisfireInstruction.CronTrigger.DoNothing; IList<ICronTrigger> triggers = new List<ICronTrigger> { trigger }; await _scheduler.ScheduleJob(job, new ReadOnlyCollection<ICronTrigger>(triggers), true); if (!_scheduler.IsStarted) await _scheduler.Start();
另外：下面一句如果存在相同名字的Job或Trigger参数replace设置为true可以更新作业的调度计划(如Cron重设)而不报错.
await _scheduler.ScheduleJob(job, new ReadOnlyCollection<ICronTrigger>(triggers), true);
await _scheduler.ScheduleJob(job, new ReadOnlyCollection<ICronTrigger>(triggers), true);
原文：https://www.cnblogs.com/chriskwok/p/12905288.html