IJobDetail job2 = JobBuilder.Create<GetData>()  //创建一个作业，添加job
                   .WithIdentity("邮件发送", "定时邮件发送")
                   .Build();

string cronExpression = "0 0 1 * * ? ";//这是指每天的凌晨1点执行任务
                ICronTrigger trigger2 = (ICronTrigger)TriggerBuilder.Create()
                .WithCronSchedule(cronExpression)                                   //不断地执行
                .Build();

//创建触发器
                /*ITrigger trigger2 = TriggerBuilder.Create()
                    .WithIdentity("定时邮件发送", "定时执行1")           //"触发器名称", "触发器组"
                    .StartNow()                                         //现在开始
                    .WithSimpleSchedule(s => s.WithIntervalInMinutes(1)  //2分钟执行一次
                    .RepeatForever())                                   //不断地执行
                    .Build();*/

scheduler.ScheduleJob(job2, trigger2);

scheduler.Start();//开启调度器