How to make ExecuteAsync run async

Question

I have asp.net app with worker service initialized like this.

builder.Services.AddHostedService<XXX>();

And then service worker itself.

public class XXX : BackgroundService
{
    readonly ILogger<XXX> _logger;

    public XXX(ILogger<XXX> logger)
    {
        _logger = logger;
    }

    public Task StartAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation("Service Started.");
        return Task.CompletedTask;
    }

    public Task StopAsync(CancellationToken cancellationToken)
    {
        _logger.LogInformation("Service Stopped.");
        return Task.CompletedTask;
    }

    protected async override Task ExecuteAsync(CancellationToken stoppingToken)
    {
       new MyInfiniteLoopClass();
    }
}

In method ExecuteAsync I am creating class MyInfiniteLoopClass which consist of infinity loop lets say while(true).

Problem is that swagger runs only when I break that infinity cycle. Which means that entire asp.net app stops on that method. How can I make side by side?

Answer 1

This is a known issue in ASP.NET Core. You can add await Task.Yield() to the top of the ExecuteAsync() and it will work:

protected async override Task ExecuteAsync(CancellationToken stoppingToken)
{
   await Task.Yield();

   new MyInfiniteLoopClass();
}

More info: https://github.com/dotnet/runtime/issues/36063