原来工作中有用到定时任务Quartz，不过是在MVC项目中，现在net core项目中也要用到，就开始改版。中间发现在网上的教程只有执行定时计划的过程，却很少有人写注册的过程，觉得有点略坑。所以写此文章一是自己做个记录，二是希望能帮助到其他人。后面还把此功能做出了多任务定时执行，网上关于net core的教程更是少了，花费了不少时间实现了出来。

Quartz版本：3.0.7

1.NuGet中下载安装Quartz

2.新建Quartz帮助类

(1)新建QuartzJob类，代码如下：

public class QuartzJob : IJob
 {
 public async Task Execute(IJobExecutionContext context)
 {
 var jobKey = context.JobDetail.Key;//获取job信息
 var triggerKey = context.Trigger.Key;//获取trigger信息

 LogHelper.Info($"{DateTime.Now} QuartzJob:==>>自动执行.{jobKey.Name}|{triggerKey.Name}");
 await Task.CompletedTask;
 }
 }

ps： 上面代码中的jobKey和triggerKey可获取到自己定义的job和trigger的信息，这样做多任务时可区分要执行的是哪个任务. 另LogHelper.Info是自己封装好的日子记录类，可替换为自己的日志类

（2）新建QuartzFactory类，代码如下：

public class QuartzFactory : IJobFactory
 {
 private readonly IServiceProvider _serviceProvider;

 public QuartzFactory(IServiceProvider serviceProvider)
 {
 _serviceProvider = serviceProvider;
 }

 public IJob NewJob(TriggerFiredBundle bundle, IScheduler scheduler)
 {
 var jobDetail = bundle.JobDetail;

 var job = (IJob)_serviceProvider.GetService(jobDetail.JobType);
 return job;
 }

 public void ReturnJob(IJob job)
 {
 }
 }

（3）新建QuartzService类，代码如下：

#region 单任务
 public static void StartJob<TJob>() where TJob : IJob
 {
 var scheduler = new StdSchedulerFactory().GetScheduler().Result;

 var job = JobBuilder.Create<TJob>()
 .WithIdentity("job")
 .Build();

 var trigger1 = TriggerBuilder.Create()
 .WithIdentity("job.trigger")
 .StartNow()
 .WithSimpleSchedule(x => x.WithInterval(TimeSpan.FromSeconds(5)).RepeatForever())
 .ForJob(job)
 .Build();

 scheduler.AddJob(job, true);
 scheduler.ScheduleJob(job, trigger1);
 scheduler.Start();
 }
 #endregion

 #region 多任务
 public static void StartJobs<TJob>() where TJob : IJob
 {
 var scheduler = new StdSchedulerFactory().GetScheduler().Result;

 var job = JobBuilder.Create<TJob>()
 .WithIdentity("jobs")
 .Build();

 var trigger1 = TriggerBuilder.Create()
 .WithIdentity("job.trigger1")
 .StartNow()
 .WithSimpleSchedule(x => x.WithInterval(TimeSpan.FromSeconds(5)).RepeatForever())
 .ForJob(job)
 .Build();

 var trigger2 = TriggerBuilder.Create()
 .WithIdentity("job.trigger2")
 .StartNow()
 .WithSimpleSchedule(x => x.WithInterval(TimeSpan.FromSeconds(11)).RepeatForever())
 .ForJob(job)
 .Build();

 var dictionary = new Dictionary<IJobDetail, IReadOnlyCollection<ITrigger>>
 {
 {job, new HashSet<ITrigger> {trigger1, trigger2}}
 };
 scheduler.ScheduleJobs(dictionary, true);
 scheduler.Start();
 }
 #endregion

 #region 配置
 public static void AddQuartz(this IServiceCollection services, params Type[] jobs)
 {
 services.AddSingleton<IJobFactory, QuartzFactory>();
 services.Add(jobs.Select(jobType => new ServiceDescriptor(jobType, jobType, ServiceLifetime.Singleton)));

 services.AddSingleton(provider =>
 {
 var schedulerFactory = new StdSchedulerFactory();
 var scheduler = schedulerFactory.GetScheduler().Result;
 scheduler.JobFactory = provider.GetService<IJobFactory>();
 scheduler.Start();
 return scheduler;
 });
 }
 #endregion

3.在Startup.cs中注册代码

public void ConfigureServices(IServiceCollection services)
{
 services.AddQuartz(typeof(QuartzJob));

 //........
}


public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
 QuartzService.StartJobs<QuartzJob>();
 //........
}

 ps: 因AddQuartz方法定义的是Type[]类型，所以可传多个执行类，如：services.AddQuartz(typeof(QuartzJob1), typeof(QuartzJob2)); 不过这样做StartJob()方法就得另处理下，这里就略过

OK，大功告成，这个东西折腾了两天终于尘埃落定了，执行结果如下：