Optional identifier for the default action
I have a site with only this route:
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute("Default", "{controller}/{action}/{id}",
new { controller = "Image", action = "Image", id = UrlParameter.Optional }
);
}
This is the controller:
public class ImageController : Controller
{
public ActionResult Image(int? id)
{
if (id == null)
{
// Do something
return View(model);
}
else
{
// Do something else
return View(model);
}
}
}
This is now the default action, so I can access it without an ID just by going to my domain. For calling the id, it works great by going to / Image / Image / ID. However, what I want is calling this without Image / Image (so / ID). Now it doesn't work.
Is this a default route restriction or is there a way to make this work?
thank
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Create a new route specific to this URL:
routes.MapRoute(
name: "Image Details",
url: "Image/{id}",
defaults: new { controller = "Image", action = "Image" },
constraints: new { id = @"\d+" });
Make sure you have registered the above route before this:
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional });
Otherwise it won't work as the default route will take precedence.
Here I am arguing that if the url contains "/ Image / 1" then the action method is executed ImageController/Image
.
public ActionResult Image(int id) { //..... // }
The constraint means the parameter {id} must be a number (based on regex \d+
), so there is no need for a nullable int, unless you want to be a nullable int, in that case remove the constraint.
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