Create a new controller in ASP.NET Core 3.0 MVC In the Solution Explorer Window, select the Controllers folder in the project, right-click and then click on Add->Controller… to create a new ...

You can customize how your Controllers deal with unhandled errors (though 'unhandled errors' don't really exist).

How to register multiple implementations of an interface with the IoC container in ASP.NET Core and retrieve a specific service at runtime.