How can i perform routing with multiple Ids in asp.net core 3.1

Question

How can i perform routing with below URLs

I have following types of URLs

1. api/country It will return all country
2. api/country/1 It will return specific country
3. api/country/1/state it will return all state of country 1
4. api/country/1/state/1 it will return specific state of specific country
5. api/country/1/state/1/city it will return all city of state 1 country 1
6. api/country/1/state/1/city/1 it will return specific city of state 1 country 1

Answer 1

Your route parameter does not have to say "id". You can pick any variable name. For instance:

[HttpGet("api/country/{countryId}/state/{stateId}/city/{cityId")]
public IActionResult GetCity(
        [FromRoute]int countryId, [FromRoute]int stateId, [FromRoute]int cityId)
{
    // pick what you want to return here
}

If you use the [ApiController] on your controller class, you wouldn't have to use [FromRoute] on every attribute.