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Quote:

Cannot add duplicate collection entry of type 'add' with combined key attributes 'users, roles, verbs' respectively set to ', Administrators, '

namespace ApiDemo.Controllers
{
    [Route("api/[controller]/[action]")]
    [ApiController]
    public class UsersController : ControllerBase
    {
        [HttpGet("{id}/{name}/{birthDate}/{isAlive}/{presNo}")]
        public IActionResult Get(int id, string name, DateTime birthDate, bool isAlive, int presNo)
        {
            return StatusCode(200);
        }
    }
}

https:// localhost:7062/api/Users/Get/12345/Rutherford%20Birchard%20Hayes%20/1822-10-04%205%3A13%3A22/false/19

[Route("api/user")]
[ApiController]
public class UserController : _ControllerBase
{
    public UserController(IConfiguration configuration) :
        base(configuration)
    {
    }

    [HttpGet("getById/{id}")]
    public IActionResult GetById([FromQuery]int id)
    {
        try
        {
            var repo = new Repository(GetDataContext());

            var owner = repo.GetById(id);

            if (owner is null)
            {
                return NotFound();
            }
            else
            {
                return Ok(owner);
            }
        }
        catch (Exception ex)
        {
            return StatusCode(500, "Internal server error");
        }
    }

    [HttpGet]
    public IActionResult GetAll()
    {
        try
        {
            var repo = new Repository(GetDataContext());

            var owners = repo.GetAll();

            return Ok(owners);
        }
        catch (Exception ex)
        {
            return StatusCode(500, "Internal server error");
        }
    }

    [HttpPost]
    public IActionResult Test([FromBody]TestEntity testEntity)
    {
        return StatusCode(200);
    }
}

https: //localhost:5001/api/User
and
https: //localhost:5001/api/User/GetById/1

[HttpPost]
public IActionResult Test([FromBody]TestEntity testEntity)
{
//...
}

https: //localhost:5001/api/User/test/{"id": 10,"name": Someone Else}

https: //localhost:2001/api/User/GetById?id=123