StopAsync和BackgroundService上的ExecuteAsync

Question

我正在使用托管服务来执行一些长时间运行的操作（检查打开的连接）。

在Implement background tasks in microservices with IHostedService and the BackgroundService class的示例中，当应用程序关闭时，有两行记录信息（在列出的代码中双引号）

但是在我的情况下，我永远无法获得第二条日志信息？我想知道为什么Microsoft如果无法访问将第二行日志记录下来。有人可以向我解释吗？

公共类GracePeriodManagerService：BackgroundService {私有只读ILogger _logger；私人只读OrderingBackgroundSettings _settings;

private readonly IEventBus _eventBus;

public GracePeriodManagerService(IOptions<OrderingBackgroundSettings>> settings,
                                 IEventBus eventBus,
                                 ILogger<GracePeriodManagerService> logger)
    {
        //Constructor’s parameters validations...       
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        _logger.LogDebug($"GracePeriodManagerService is starting.");

        stoppingToken.Register(() => 
               _logger.LogDebug($" GracePeriod background task is stopping."));

        while (!stoppingToken.IsCancellationRequested)
        {
            _logger.LogDebug($"GracePeriod task doing background work.");

            // This eShopOnContainers method is querying a database table 
            // and publishing events into the Event Bus (RabbitMS / ServiceBus)
            CheckConfirmedGracePeriodOrders();

            await Task.Delay(_settings.CheckUpdateTime, stoppingToken);
        }

        _logger.LogDebug($"GracePeriod background task is stopping.");

    }

    protected override async Task StopAsync (CancellationToken stoppingToken)
    {
           // Run your graceful clean-up actions
    } }

Answer 1

这是一个很老的线程，但是我看不到您实现IHostService或BackgroundService。