Define MVC Route by name in .net Core - asp.net-mvc

Question

I have 2 routes defined:
app.UseEndpoints(endpoints =>
{
endpoints.MapControllerRoute("default", "{controller=Home}/{action=Index}/{id?}");
endpoints.MapControllerRoute("api", "{controller=Home}/api/v1/{action=Index}/{id?}");
});
In the controller, if I don't specify a route in the controller it will use either one. Both urls work:
https://myapp/mymodel/api/v1/id/123
https://myapp/mymodel/id/123
I want it to work only with the first url, but if add for example [Route("api")] to the controller none of the above routes work.
[Route("api")] //with this line it returns 404
public mymodel ID(int? id)
{
//some code
}

Answer 1

From the official doc :
Route names can be used to generate a URL based on a specific route. Route names have no impact on the URL matching behavior of routing and are only used for URL generation. Route names must be unique application-wide.
Here is a workaround on customizing a actionfilter attribute that checks if the url matches the route template for api , you could refer to:
ApiRouteTemplateAttribute
public class ApiRouteTemplateAttribute:ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext context)
{
var routeTemplate = "{controller=Home}/api/v1/{action=Index}/{id?}";
var template = TemplateParser.Parse(routeTemplate);
var matcher = new TemplateMatcher(template, GetDefaults(template));
var routeValues = new RouteValueDictionary();
string LocalPath = context.HttpContext.Request.Path;
var result = matcher.TryMatch(LocalPath, routeValues);
//if the match is false ,return a exception information.
if (!result)
{
context.Result = new BadRequestObjectResult(new Exception("The url is incorrect!"));
}
}
private RouteValueDictionary GetDefaults(RouteTemplate parsedTemplate)
{
var result = new RouteValueDictionary();
foreach (var parameter in parsedTemplate.Parameters)
{
if (parameter.DefaultValue != null)
{
result.Add(parameter.Name, parameter.DefaultValue);
}
}
return result;
}
}
Controller
[ApiRouteTemplate]
public Exam ID(int? id)
{
return _context.Exams.Find(id);
}
Result