How to implement routing in MVC application
Understand routing in MVC application
In this article we will learn routing in MVC application.
Routing concept is very primary concept of MVC application and every developer
should know it to develop MVC application. Let’s create one view page and one
controller at first. Here is simple code to create view.
Create view
@model MVCTest.Models.Person
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<title>Index</title>
</head>
<body>
<div>
This
is Test Page...
</div>
</body>
</html>
Create
simple controller
public class PersonController : Controller
{
public ActionResult Index()
{
return View("Index");
}
}
The
controller name is Person and it contains one action named Index and this
action will call Index view which we have created at first.
Let’s start with routing
Routing happens in global.aspx page. To enable routing in application
at first we have to enable routing in Application’s start event. In below we
are starting routing within Application_Start event.
protected void Application_Start()
{
RegisterRoutes(RouteTable.Routes);
}
Now,
within RegisterRoutes() event we have to define collection of routing
information. routes.MapRoute() is collection where data stores in key value pair. We can add more
than one routing collection here.
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute("Default", //
Route name
"{controller}/{action}/{id}",
// URL with parameters
new { controller = "Person",
action = "Index", id = UrlParameter.Optional } // Parameter
defaults
);
}
In above example we have defined single routing information.
The route name is “Default” and the default URL pattern is in below format.
Controller/Action/id
And we are setting value using new operator. Here our
default controller’s name is Person and default action is Index and we are
specifying id is an optional parameter. Means when we will invoke this action
the parameter value is optional.
Now, Lets run this application
with proper URL. Here is sample output.
The concept is, at the start
time of application Default route get call, means if we do not call any
particular action then by default the action will get call which is defined in
Default route.
How to change the sequence of routing information?
We can change the sequence in our own. Have a look on below
code.
routes.MapRoute(
"Default", // Route name
"{action}/{controller}/{id}",
// URL with parameters
new {
action = "Index", controller = "Person", id = UrlParameter.Optional
} // Parameter defaults
);
Here we have defined action at first then the controller. So
the sequence is.
Action/Controller/id
And the corresponding value is
Action=”Index”, controller=”Person”, id=”UrlParemeter.Optional”
So we are passing at first action name and then controller
name. Here is sample output.
Conclusion:-
In this article we have discuss basic routing concept in MVC application. Hope you have understood the basic concept and in coming up articles we will discuss more on same topic.