Final answer:
To make Sitecore recognize a controller rendering, create a controller and action, define them in a new Sitecore rendering item, and add the rendering to a placeholder in the page layout. Ensure all assemblies are deployed and the controller is registered if necessary.
Step-by-step explanation:
To make Sitecore recognize a controller rendering, you must first create a controller class that derives from Sitecore's standard controller, usually Sitecore.Mvc.Controllers.SitecoreController. Then, define an action method inside this controller which will return a view result. After setting up your controller and action method, you will need to create a new rendering in Sitecore and specify the controller and action in the rendering's item fields, specifically in the 'Controller' and 'Action' fields.
The next step is to add this rendering to a placeholder in your page layout. Sitecore's layout engine will pick up this configuration when the corresponding page is requested, and the rendering pipeline will execute your controller's action method, rendering the view associated with it.
Lastly, ensure that all necessary assemblies are referenced and deployed to the Sitecore environment, and that the controller is registered in the RouteConfig if needed. That is how you integrate a custom controller rendering into a Sitecore solution, enabling more dynamic content delivery.