简述

Quartz中主要分为三部分，JobDetail、Trigger、Scheduler，分别是任务、触发器、调度器，三者的关系为：Trigger控制JobDetail的执行时间和频率，而Scheduler负责将具体的Trigger与具体的JobDetail绑定

1.安装Quartz依赖

2.编写代码

①实现IJob接口与创建JobDetail

实现IJob接口

public class MyJob : IJob
{
    public async Task Execute(IJobExecutionContext context)
    {
        // context.ScheduledFireTimeUtc?.LocalDateTime 执行时间
        // context.NextFireTimeUtc?.LocalDateTime 下次执行时间
        Console.WriteLine($"任务执行：{DateTime.Now}");
        Console.WriteLine($"执行时间：{context.ScheduledFireTimeUtc?.LocalDateTime}");
        Console.WriteLine($"下次执行时间：{context.NextFireTimeUtc?.LocalDateTime}");
        await Task.CompletedTask;
    }
}

 创建JobDetail

public class JobDetailGetter
{
    public static IJobDetail GetJobDetail<T>(JobKey name) where T : IJob
    {
        return JobBuilder.Create<T>()
            .WithIdentity(name)
            .Build();
    }
}

Execute函数中的代码即为定时任务执行的操作

②创建Trigger

var triggerBuilder = TriggerBuilder.Create()
    //.StartNow()
    .StartAt(startTime)
    .EndAt(endTime)
    .WithSimpleSchedule(x => x
        .WithIntervalInSeconds(intervalInSeconds) // 设置时间间隔: 秒
        //.WithRepeatCount(10)                    // 设置间隔时长
        .RepeatForever());

public class TriggerGetter
{
    public static ITrigger GetSecondsTrigger(DateTimeOffset startTime, DateTimeOffset endTime, int intervalInSeconds)
    {
        // Trigger构造器
        var triggerBuilder = TriggerBuilder.Create()
            //.StartNow()
            .StartAt(startTime)
            .EndAt(endTime)
            .WithSimpleSchedule(x => x
                .WithIntervalInSeconds(intervalInSeconds) // 设置时间间隔: 秒
                //.WithRepeatCount(10)                      // 设置间隔时长
                .RepeatForever());

        // 构造并返回Trigger
        return triggerBuilder.Build();
    }
}

③创建Scheduler（建议使用单例封装）

public class SchedulerGetter
{
    // 由CLR保证: 在程序第一次使用该类之前被调用, 而且只调用一次
    private static readonly IScheduler scheduler = StdSchedulerFactory.GetDefaultScheduler().Result;
    public static async Task<IScheduler> GetSchedulerAsync()
    {
        return scheduler;
    }
}

3.测试

static async Task Main(string[] args)
{
    IScheduler scheduler = await SchedulerGetter.GetSchedulerAsync();

    var startTime = new DateTimeOffset(DateTime.Now);
    var endTime = new DateTimeOffset(DateTime.Now.AddSeconds(10));
    ITrigger trigger = TriggerGetter.GetSecondsTrigger(startTime, endTime, 3);

    IJobDetail jobDetail = JobDetailGetter.GetJobDetail<MyJob>(new JobKey("ABC"));

    await scheduler.ScheduleJob(jobDetail, trigger);

    Thread.Sleep(10000);
}