.NET Core 实现后台任务（定时任务）IHostedService

• program添加服务

  // .Net 6
  builder.Services.AddHostedService<TestHostedService>();
  
  // .Net  5 及以下
  services.AddHostedService<TestHostedService>();

   

• 添加工作类

 public class TestHostedService : IHostedService, IDisposable
    {
        private Timer? _timer;

        /// <summary>
        /// 任务开始
        /// </summary>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public Task StartAsync(CancellationToken cancellationToken)
        {
            _timer = new Timer(DoWork, null, TimeSpan.Zero, TimeSpan.FromSeconds(5));

            return Task.CompletedTask;
        }

        private void DoWork(object? state)
        {
            Console.WriteLine($"{DateTime.Now:yyyy-MM-dd HH:mm:ss}");
        }

        /// <summary>
        /// 任务停止
        /// </summary>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public Task StopAsync(CancellationToken cancellationToken)
        {
            Console.WriteLine("StopAsync");

            return Task.CompletedTask;
        }


        public void Dispose()
        {
            _timer?.Dispose();
        }
    }

• 效果