How do route parameters work in ASP.NET MVC API routing?

How do route parameters work in ASP.NET MVC API routing?

In ASP.NET MVC, route parameters are placeholders in the URL that allow you to pass data to your controller actions. For example, in a route like /products/{id}, {id} is a route parameter that can be accessed in your action method.

Can you give me an example of how to define a route with parameters?

Sure! You can define a route with parameters in the RouteConfig.cs file like this: routes.MapRoute(name: "Default", url: "products/{id}", defaults: new { controller = "Products", action = "Details" }); This maps the URL to the Details action of the Products controller.

What if I want to make the parameter optional?

To make a route parameter optional, you can use a question mark in the route definition. For example: routes.MapRoute(name: "Default", url: "products/{id?}", defaults: new { controller = "Products", action = "Index" }); This way, if no id is provided, it will call the Index action.

How do I access the route parameter in my controller?

You can access the route parameter in your controller action by adding a parameter with the same name as the route parameter. For example: public ActionResult Details(int id) will give you access to the id passed in the URL.