Cannot access APIs when add IHostedService service in ASP.NET Core-CodePudding

I use .NET 6 and when I add an IHostedService service in ASP.NET Core, I cannot access the APIs. If I remove the IHostedService, I can access the APIs.

Add IHostedService:

//builder.Services.AddHostedService<WSService>();
builder.WebHost.ConfigureServices(services => services.AddHostedService<WSService>());

public class WSService : IHostedService
{
    public async Task StartAsync(CancellationToken cancellationToken)
    {
        while (true)
        {
            System.Console.WriteLine("back ground task");
            await Task.Delay(5 * 1000);
        }
    }
    public async Task StopAsync(CancellationToken cancellationToken)
    {
        await Task.CompletedTask;
    }
}

If add IHostedService, cannot access http://localhost:5000/Query

namespace Api.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class QueryController : ControllerBase
    {
        private readonly IQueryData _queryData;

        public QueryController(IQueryData queryData)
        {
            _queryData = queryData;
        }

        [HttpGet]
        public async Task<IActionResult> Query([FromQuery] QueryDataRequest request, CancellationToken cancellationToken)
        {
            var data = await _queryData.PagingQueryAsync(request, cancellationToken);
            return new JsonResult(data);
        }

    }
}

Add IHostedService will not print these logs, it seems the WebHost is not running

So, how to resolve this problem, thanks!

CodePudding user response：

You are causing an infinite loop on your StartAsync method, and as noted by the documentation here:

StartAsync should be limited to short running tasks because hosted services are run sequentially, and no further services are started until StartAsync runs to completion.