Csharp 如何在特定时间间隔运行多个后台任务

您是否需要 for each 任务提供单独的服务？

这里有多个选项:

• 官方文档显示了创建Timed background tasks的选项:

  public class TimedHostedService : IHostedService, IDisposable
  {
       private int executionCount = 0;
       private readonly ILogger<TimedHostedService> _logger;
       private Timer? _timer = null;
  
       public TimedHostedService(ILogger<TimedHostedService> logger)
       {
           _logger = logger;
       }
  
       public Task StartAsync(CancellationToken stoppingToken)
       {
           _logger.LogInformation("Timed Hosted Service running.");
  
           _timer = new Timer(DoWork, null, TimeSpan.Zero,
               TimeSpan.FromSeconds(5));
  
           return Task.CompletedTask;
       }
  
       private void DoWork(object? state)
       {
           var count = Interlocked.Increment(ref executionCount);
  
           _logger.LogInformation(
               "Timed Hosted Service is working. Count: {Count}", count);
       }
  
       public Task StopAsync(CancellationToken stoppingToken)
       {
           _logger.LogInformation("Timed Hosted Service is stopping.");
  
           _timer?.Change(Timeout.Infinite, 0);
  
           return Task.CompletedTask;
       }
  
       public void Dispose()
       {
           _timer?.Dispose();
       }
  }
  

  您可以将此方法与多个计时器一起使用.

• 您可以只启动ExecuteAsync个任务中的几个任务:

  protected override async Task ExecuteAsync(CancellationToken stoppingToken)
  {
       await Task.WhenAll(Job1(stoppingToken), Job2(stoppingToken));
  }
  
  public async Task Job1(CancellationToken stoppingToken)
  {
       using PeriodicTimer timer = new PeriodicTimer(period1);
       while (
           !stoppingToken.IsCancellationRequested && await timer.WaitForNextTickAsync(stoppingToken))
       {
           Console.WriteLine("Work1");
       }
  }
  
  public async Task Job2(CancellationToken stoppingToken)
  {
       using PeriodicTimer timer = new PeriodicTimer(period2);
       while (
           !stoppingToken.IsCancellationRequested && await timer.WaitForNextTickAsync(stoppingToken))
       {
           Console.WriteLine("Work2");
       }
  }
  

• 使用不同的托管服务，每个任务一个(本例中是我个人的转到选项)

• 还可以考虑更换一些调度库/框架，如Hangfire或Quartz.NET