How to allow nullable boolean URI parameter?-CodePudding

I want to let users retrieve data in three ways:

If isEven = null (default) then both even and odd numbers are returned.
If isEven = true then even numbers are returned.
If isEven = false then odd numbers are returned.

[ApiController]
[Route("api/[controller]/[action]")]
public class MathematicsController : ControllerBase
{
    [Route("{isEven:bool?}")]
    [HttpGet]
    public IActionResult GetData(bool? isEven = null)
    {
        var data = Enumerable.Range(1, 30).AsQueryable();

        if (isEven is not null)
            data = data.Where(x => (x % 2 == 0) == isEven);

        return Ok(data.ToList());
    }
}

Unfortunately, Swagger does not allow us to execute without selecting the dropdown box. I already set the parameter with a trailing question mark ({isEven:bool?}) to represent that the parameter is optional. What am I missing here?

Addendum

I think Swagger UI is the culprit. I tested with Chrome by navigating to https://localhost:40443/api/mathematics/getdata (or with a trailing slash) and it works. Case closed!

CodePudding user response：

If you have do it via path you could:

[Route("{isEven}")]
[HttpGet]
public IActionResult GetData(bool isEven) => DoGetData(isEven);

[HttpGet]
public IActionResult GetData() => DoGetData(isEven: null);

This gives you:

.../api/Mathematics/GetData/true
.../api/Mathematics/GetData/false
.../api/Mathematics/GetData