What are route constraints in ASP.NET MVC?

What are route constraints in ASP.NET MVC?

Route constraints in ASP.NET MVC are rules that determine whether a route should be matched based on the values of the route data. They help in validating incoming requests.

Can you give me an example of how to use route constraints?

Sure! For example, you can create a route constraint that only allows numeric values for a parameter like this: routes.MapRoute("Default", "{controller}/{action}/{id:int}");.

What happens if a route constraint is not met?

If a route constraint is not met, the routing engine will skip that route and continue to check the next routes until it finds a match or exhausts all options.

Are there built-in route constraints in ASP.NET MVC?

Yes, ASP.NET MVC provides several built-in route constraints like int, bool, guid, and string, which you can use to validate route parameters.