使用Quartz.net动态设置定时时间问题

 /// <summary>
        /// 定时方法
        /// </summary>
        /// <param name="week">天</param>
        /// <param name="hour">时</param>
        /// <param name="minute">分</param>
        private void Timing(string week, string hour, string minute)
        {
            IScheduler sched1;
            ISchedulerFactory sf1 = new StdSchedulerFactory();
            sched1 = sf1.GetScheduler();
            JobKey jobkey1 = new JobKey("myjob1", "mygroup1");
            IJobDetail job1 = JobBuilder.Create<WebDemo.quartz>().WithIdentity(jobkey1).Build();
            string t = "";
            if (week == "*")
            {
                //每天
                t = "0 " + minute + " " + hour + " ? * *";//每天的某时某分0秒
            }
            else
            {
                //某天
                t = "0 " + minute + " " + hour + " ? * " + week;//某天的某时某分0秒
            }
            CronExpression cron = new CronExpression(t);
            IOperableTrigger trigger1 = new CronTriggerImpl("trigName1", "group12", cron.CronExpressionString);
            sched1.ScheduleJob(job1, trigger1);
            sched1.Start();
        }