在控制台应用中实现一个计划任务

static System.Timers.Timer timer;
public static void Main()
{
	  var services = new ServiceCollection();
	  ConfigureServices(services);
	  // 创建ServiceProvider
	  var serviceProvider = services.BuildServiceProvider();
	  // app程序运行入口
	  await serviceProvider.GetService<App>().Run(args);
}
public static void ConfigureServices(IServiceCollection services)
{
	services.AddSingleton<MyJob>();
}


//打开计划任务
public class App
{
	MyJob job;
	public App(MyJob job)
	{
		this.job=job;
		job.Start(10);
	}
}
//计划任务
public class MyJob 
{
    System.Timers.Timer timer;

    public MyJob()
    {
        timer = new System.Timers.Timer(Interval);
        timer.AutoReset = true;
    }
    public void Start(int second)
    {
        Interval = second*1000;
        timer.Interval=Interval;
		timer.Enabled = true;
		timer.AutoReset = true;
    }
	public void Stop()
	{
		timer.Enabled = false;
		timer.AutoReset = false;
	}
     int Interval { get; set; } = 5000;
    private void Timer_Elapsed(object? sender, System.Timers.ElapsedEventArgs e)
    {
        Console.WriteLine(e.SignalTime.ToString());
    }
}

在asp.net应用中实现一个计划任务

1. 自定义一个任务类MyMob.cs，继承BackgroundService

2. 实现ExecuteAsync()

   启动定时器

3. 注册计划任务

   builder.Services.AddHostedService<MyMob>();

计划任务实例代码

public class MyJob : BackgroundService
{
    //每隔5秒执行一次
        System.Timers.Timer timer = new System.Timers.Timer(5000);
    protected override Task ExecuteAsync(CancellationToken stoppingToken)
    { 
        return Task.CompletedTask;
		var timer = new System.Timers.Timer(5000);
		 timer.Enabled = true;
		 timer.Elapsed += Timer_Elapsed;
		 timer.AutoReset = true;
		 //timer.Enbled=false;//暂停计时器
		 //timer.Interval=2000;//改变时间间隔为2秒
		 return Task.CompletedTask;
    }
    
    private void Timer_Elapsed(object? sender, ElapsedEventArgs e)
    {
        //任务内容
        Console.WriteLine(e.SignalTime.ToString());
    }
}

//注册服务
builder.Services.AddHostedService<MyMob>();