How to automatically set all parameters of ASP. net mvc to default

Today, I saw a problem with CSDN and thought it was a bit interesting: "Can I use ASP. net mvc all parameters are automatically set to the default "Copy code public class HomeController: Controller {public ActionResult Index (int para1, string para2, int para3, bool para4) {return View () ;}} if no route is configured for the code, an error is returned when you directly access localhost, because some of the parameters are not assigned a value to the server error in the <span>