_timer = new Timer(DoWork, null, TimeSpan.Zero, _logger.LogInformation( "Timed Hosted Service running.") Public Task StartAsync( CancellationToken stoppingToken) Public TimedHostedService( ILogger logger) Public class TimedHostedService : IHostedService, IDisposable The timer is disabled on StopAsync and disposed when the service container is disposed on Dispose: 1 The timer triggers the task’s DoWork method. Protected override async Task ExecuteAsync( CancellationToken cancellationToken)Ī timed background task makes use of the class. Public class SampleBackgroundService : BackgroundService For more information, see the IHostedService interface section. Otherwise, the service ungracefully shuts down at the shutdown timeout. Your implementation of ExecuteAsync should finish promptly when the cancellation token is fired in order to gracefully shut down the service. The cancellation token is triggered when IHostedService.StopAsync is called. The host blocks in StopAsync(CancellationToken) waiting for ExecuteAsync to complete. Avoid performing long, blocking initialization work in ExecuteAsync. No further services are started until ExecuteAsync becomes asynchronous, such as by calling await. The implementation returns a Task that represents the entire lifetime of the background service. Public Task StopAsync( CancellationToken cancellationToken)īackgroundService is a base class for implementing a long running IHostedService.ĮxecuteAsync(CancellationToken) is called to run the background service. Public Task StartAsync( CancellationToken cancellationToken) Public class SampleHostedService : IHostedService Therefore, any methods called or operations conducted in StopAsync might not occur. If the app shuts down unexpectedly, StopAsync might not be called. However, tasks aren’t abandoned after cancellation is requested-the caller awaits all tasks to complete. Any methods called in StopAsync should return promptly.Any remaining background operations that the app is performing should be aborted.When cancellation is requested on the token: The cancellation token has a default five second timeout to indicate that the shutdown process should no longer be graceful. Implement IDisposable and finalizers (destructors) to dispose of any unmanaged resources. StopAsync contains the logic to end the background task. StopAsync(CancellationToken): Triggered when the host is performing a graceful shutdown. The default behavior can be changed so that the hosted service’s StartAsync runs after the app’s pipeline has been configured and ApplicationStarted is called.
The server is started and IApplicationLifetime.ApplicationStarted is triggered.The app’s request processing pipeline is configured (Startup.Configure).StartAsync(CancellationToken): StartAsync contains the logic to start the background task. The IHostedService interface defines two methods for objects that are managed by the host: Queued background tasks that run sequentially.The scoped service can use dependency injection (DI). Hosted service that activates a scoped service.This topic provides three hosted service examples: A hosted service is a class with background task logic that implements the IHostedService interface. In ASP.NET Core, background tasks can be implemented as hosted services.
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