BackgroundService - Is it possible to set parameter value?

Cenk 956

Hi,

I have a background service. I wonder if it is possible to set a parameter to this service from the Blazor Server application or in any other way?

Thank you in advance.

Zhi Lv - MSFT 32,011 Reputation points Microsoft Vendor

2023-02-03T07:02:40.0166667+00:00

if it is possible to set a parameter to this service from the Blazor Server application or in any other way?

Can you explain more detail information? It is better to create a simple sample with some code, so that it is easier for us to understand what you want?

Cenk 956

I actually want to set the periodic timer externally, not manually in the worker.

public class Worker : BackgroundService
    {
        private readonly ILogger<Worker> _logger;
        private readonly IHttpClientFactory _httpClientFactory;
        private readonly IConfiguration _configuration;

        public Worker(ILogger<Worker> logger, IHttpClientFactory httpClientFactory, IConfiguration configuration)
        {
            _logger = logger;
            _httpClientFactory = httpClientFactory;
            _configuration = configuration;
        }

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            ///Random Timer
            var timer = new PeriodicTimer(TimeSpan.FromMinutes(new Random().Next(1, 3)));
            _logger.LogInformation("Timer: {timer}", DateTimeOffset.Now);
            while (await timer.WaitForNextTickAsync(stoppingToken))
            {
                await GetData();
                _logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);
            }
        }

Zhi Lv - MSFT 32,011 Reputation points Microsoft Vendor

2023-02-06T09:40:38.0033333+00:00

Try to store the timer timespan in the configure file (appsettings.json) file or database, then when start the background service get the timespan and use it. In this scenario, you can edit the timer timespan in the configure file or database.
Cenk 956 Reputation points

2023-02-06T10:19:31.34+00:00

Do I have to restart the worker every time I change the timespan?
Zhi Lv - MSFT 32,011 Reputation points Microsoft Vendor

2023-02-07T06:31:00.82+00:00

Do I have to restart the worker every time I change the timespan?

Yes, you have to restart the worker.

Besides, you can refer to Edward's reply in this thread to start/stop the worker manually:

ASP.NET Core IHostedService manual start/stop/pause(?)

1 answer

Bruce (SqlWork.com) 55,366 Reputation points

2023-02-02T18:45:27.95+00:00

if the background service is in the same application, then just use a shared collection (queue):

https://learn.microsoft.com/en-us/dotnet/api/system.collections.concurrent.concurrentqueue-1?view=net-7.0
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