How can routing be incorporated from one controller into the route of another controller in asp.net REST API?

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One way to incorporate routing from one controller into the route of another controller is by using attribute routing. Attribute routing allows you to define routes directly on the controller or action methods using attributes.

For example, let's say you have a UsersController that handles routes for users and you want to incorporate routing from a different controller called ProductsController.

You can define a route attribute on the action method in ProductsController like this:

[Route("api/users/{userId}/products/{productId}")]
public IHttpActionResult GetProduct(int userId, int productId)
{
    // get product for specified user
}

Then in the UsersController, you can add a route attribute that incorporates the ProductsController route like this:

[Route("api/users/{userId}/products/{productId}")]
public IHttpActionResult GetProduct(int userId, int productId)
{
    // get product for specified user
}

This will route requests to the UsersController's GetProduct method, but the route will also include the {productId} parameter from the ProductsController's route.

Note that when using attribute routing, you should also enable it in your WebApiConfig file like this:

config.MapHttpAttributeRoutes();

This will enable Web API to use the route attributes defined in your controller and action methods.