How to prevent Browser returning default value of int when input is an int parameter in the URL? - asp.net-mvc-4

Question

public IActionResult Info(int id)
{
return Content(id + "");
}
Whenever I input Jan/Info/2 the browser returns me the value 0. Why is this and how can I fix this? I'm using MVC core 1.1. UrlParameter.Optional is also not present in Visual Studio for some reason it's not accessible.
app.UseMvc(routes =>
{
routes.MapRoute(
name: "Naam",
template: "{controller=Jan}/{action}/{voornaam}");
routes.MapRoute(
name: "Info",
template: "{controller=Jan}/{action}/{id}");
}
public IActionResult Naam(string voornaam)
{
return Content(voornaam);
}

Answer 1

Because you already have another route registration which is matching the exact pattern. As per that registration, it will read the value and assign to the voornaam parameter.
So this should work
public IActionResult Info(int voornaam)
{
return Content(voornaam + "");
}
Since you have unique names for your action method, you do not need to specify the custom routes for each action method. The default route registration will work fine.
app.UseMvc(routes =>
{
routes.MapRoute(
name: "defaultroutes",
template: "{controller}/{action=Index}/{id?}",
defaults: new { controller = "jan" });
});
Assuming your controller looks like this
public class JanController : Controller
{
public IActionResult Info(int id)
{
return Content(id + " : id");
}
public IActionResult Naam(string voornaam)
{
return Content(voornaam+ ": param value");
}
}
When you access yourSite/jan/info/123, The Info method will handle that and when you request yourSite/jan/Naam?voornaam=shyju ,the Naam method will handle that.
If you want to support url structure like yourSite/jan/Naam/shyju instead of the explicit querystring, you can specify a route pattern on that action method with attribute routing
public class JanController : Controller
{
public IActionResult Info(int id)
{
return Content(id + " id");
}
[Route("[controller]/[action]/{voornaam}")]
public IActionResult Naam(string voornaam)
{
return Content(voornaam + " : param value");
}
}
Now when you request yourSite/jan/Naam/shyju, The Naam method will be called and the string "shyju" will be available in the voornaam parameter