Creating a custom route constraint in asp.net mvc

Create a Routing constraint (C #)

You can use routing constraints to restrict browser requests that match a particular path. You can use a regular expression to create a routing constraint.

For example, suppose you have defined routes as follows:

Listing 1-global.asax.cs

Routes. Maproute (

"Product",

"Product/{productid}",

New {controller= "Product", action= "Details"}

);

Listing 1 contains a route named product. You can use this Product route to map browser requests to Productcontroller, as follows:

Listing 2-controllers\productcontroller.cs

Using SYSTEM.WEB.MVC;

Namespace Mvcapplication1.controllers

{

public class Productcontroller:controller

{

Public ActionResult Details (int productId)

{

return View ();

}

}

}

Note: the Details () action receives a single parameter named ProductID. This parameter is an integer parameter.

The route defined in Listing 1 will matches any one of the URLs:

?/product/23

?/PRODUCT/7

Unfortunately, this route also matches the following URLs:

?/product/blah

?/product/apple