Question

我想运行一个在给定时间执行数据库更新的任务。我不确定这是否是正确的方法，或者是否可以注册该任务以在可以参数化的特定时间运行？

    internal class TimedHostedService : IHostedService
    {
        private readonly ILogger _logger;
        private readonly ProductionContext _context;

        public TimedHostedService(ILogger<TimedHostedService> logger, ProductionContext context)
        {
            _logger = logger;
            _context = context;
        }

        public Task StartAsync(CancellationToken cancellationToken)
        {
            _logger.LogInformation("Timed Background Service is starting.");

            return Task.CompletedTask;
        }

        private void DoWork(object state)
        {
            _logger.LogInformation("Timed Background Service is working.");

            if (DateTime.Now.TimeOfDay == new TimeSpan(6, 58, 0) ||
             DateTime.Now.TimeOfDay == new TimeSpan(14, 58, 0) ||
             DateTime.Now.TimeOfDay == new TimeSpan(22, 58, 0))
            {
                var registos = _context.Registos.Where(r => r.DataFimTurno.HasValue);

                var registosModified = registos;

                foreach (var item in registosModified)
                {
                    item.DataFimTurno = DateTime.Now;
                }

                _context.Entry(registos).CurrentValues.SetValues(registosModified);
            }
        }

        public Task StopAsync(CancellationToken cancellationToken)
        {
            _logger.LogInformation("Timed Background Service is stopping.");

            return Task.CompletedTask;
        }

    }

Answer 1

如果您想使用IHostedServices，则可以尝试以下代码，该代码将在特定时间运行任务：

public Task StartAsync(CancellationToken cancellationToken)
    {
        while (!cancellationToken.IsCancellationRequested)
        {
            var currentTime = DateTime.UtcNow;
            //run background task at 11:00:00
            if(currentTime.Hour == 11 && currentTime.Minute == 0 && currentTime.Second == 0)
            {
                _logger.LogInformation(currentTime.ToString());
                DoWork();
            }              

        }

        return Task.CompletedTask;
    }

如果您想传递BackgroundService的参数，也可以使用DI注册它，请参阅

How to pass parameters for BackgroundService?

ASP.NET Core在给定时间运行后台任务

1 个答案: