How routing works in ASP.NET MVC4

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I'm developing an ASP.NET MVC4 application and I'm new. I have two MapRoutes for routing. 

routes.MapRoute("Char", 
                "ABC/Alpha/{number1}",
                 defaults: new { Controller = "ABC", action = "Alpha" });          
 
routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index",  id=UrlParameter.Optional }
        );

I didn't assign any default value to the number1 in the MapRoutes. But I know it is mandatory because it is in the URL path. 

If I didn't provide any parameter in the url (when I run the app), I should get an error but I didn't.

Can anyone help me?

  1. Post:378

    Points:2694
    Re: How routing works in ASP.NET MVC4

    Hi Pravesh, 


    The Route path is checked from top to bottom, so in the first case 

    {Controller}/{Action}/{ID}

    is passed by you (mention the id is must here) so the First routepath works 

    but Magic you was expecting the second case to throw an error, and it should have because if your Action is like 

    public ActionResult ActionName(int id)
    {
    //some Code
    }

    then for sure it would have thrown error like Action 

    "Cannot convert null to 'int' because it is a non-nullable value type"

    and i'm Pretty sure your Action will be having either 

     public ActionResult(int? id)
     {//Some Code here}
    or 
    Public ActionResult()
    {
    //Some Code here
     }

      Modified On Apr-05-2018 06:16:52 AM

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