dotnet api controller run long running job - populate cache example

CacheController.cs

using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.DependencyInjection;

namespace MyNamespace.Controllers;

[Route("/api/cache")]
[ApiController]
public class CacheController : ControllerBase
{
    [HttpGet("populate-cache")]
    public IActionResult PopulateCache([FromServices] IServiceScopeFactory serviceScopeFactory)
    {
        // Do not capture services injected into the controllers on background threads
        // https://docs.microsoft.com/en-us/aspnet/core/performance/performance-best-practices?view=aspnetcore-3.1#do-not-capture-services-injected-into-the-controllers-on-background-threads
        _ = Task.Run(async () =>
        {
            await Task.Delay(1000);

            using (var scope = serviceScopeFactory.CreateScope())
            {
                var myCacheService = scope.ServiceProvider.GetRequiredService<MyCacheService>();

                await myCacheService.BuildCache();
            }
        });

        return Accepted();
    }
}

public class MyCacheService
{
    public async Task BuildCache()
    {
        // do long running stuff here
        await Task.Delay(5000);
    }
}