ServiceController.cs

[ApiController]
[Route("[controller]")]
public class ServiceController : ControllerBase
{
    private readonly ITransientService _transientService;
    private readonly IScopedService _scopedService;
    private readonly ISingletonService _singletonService;

    public ServiceController(ITransientService transientService, IScopedService scopedService, ISingletonService singletonService)
    {
        _transientService = transientService;
        _scopedService = scopedService;
        _singletonService = singletonService;
    }

    [HttpGet("Transient")]
    public string Transient()
    {
        return _transientService.GetValue();
    }

    [HttpGet("Scoped")]
    public string Scoped()
    {
        return _scopedService.GetValue();
    }

    [HttpGet("Singleton")]
    public string Singleton()
    {
        return _singletonService.GetValue();
    }

}