简述

有时会遇到需要在IJob实现类中依赖注入其他类或接口的情况，但Quartz的默认JobFactory并不能识别具有有参构造函数的IJob实现类，也就无法进行依赖注入

需要被依赖注入的类：

public class TestClass
{
    public TestClass(Type jobType, string cronExpression)
    {
        JobType = jobType;
        CronExpression = cronExpression;
    }

    public Type JobType { get; }
    public string CronExpression { get; }
}

解决方式

1.安装依赖：Quartz、Microsoft.Extensions.DependencyInjection

2.实现接口

        实现IJob接口

    public class MyJob : IJob
    {
        private readonly TestClass test;
        public MyJob(TestClass test)
        {
            this.test = test;
        }

        public Task Execute(IJobExecutionContext context)
        {
            Console.WriteLine("hello");
            Console.WriteLine(test.ToString());
            return Task.CompletedTask;
        }
    }

        实现IJobFactory接口

public class MyJobFactory : IJobFactory
{
    private readonly IServiceProvider _serviceProvider;
    public MyJobFactory(IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
    }

    public IJob NewJob(TriggerFiredBundle bundle, IScheduler scheduler)
    {
        return _serviceProvider.GetRequiredService(bundle.JobDetail.JobType) as IJob;
    }

    public void ReturnJob(IJob job) { }
}

3.将IJob实现类、IJobFactory实现类、需要被依赖注入的类（TestClass）添加进容器

private static ServiceProvider ConfigureServices()
{
    var services = new ServiceCollection();

    services.AddSingleton<MyJob>();

    services.AddSingleton<IJobFactory, MyJobFactory>();

    services.AddSingleton(new TestClass(
        jobType: typeof(MyJob),
        cronExpression: "0/5 * * * * ?"));

    return services.BuildServiceProvider();
}

4.将scheduler的JobFactory属性替换为IJobFactory实现类的实例

var scheduler = await StdSchedulerFactory.GetDefaultScheduler();

// JobFactory替换为IJobFactory实现类的实例
scheduler.JobFactory = serviceProvider.GetService<IJobFactory>();

5.测试

        static async Task Main(string[] args)
        {
            var serviceProvider = ConfigureServices();

            var scheduler = await StdSchedulerFactory.GetDefaultScheduler();

            // JobFactory替换为IJobFactory实现类的实例
            scheduler.JobFactory = serviceProvider.GetService<IJobFactory>();

            var jobSchedule = serviceProvider.GetService<TestClass>();
            var jobDetail = JobBuilder.Create(jobSchedule.JobType).Build();
            var trigger = TriggerBuilder.Create()
                .WithCronSchedule(jobSchedule.CronExpression)
                .Build();

            await scheduler.ScheduleJob(jobDetail, trigger);
            await scheduler.Start();

            Thread.Sleep(10000);
        }