Abordagem diferente para if/cases

Ao inves do usual if/cases, normalmente usados, como:

public class SomeController
{
 public ActionResult TheAction(string whichButton, UserData userData)
 {
  if(whichButton == "Back")
  {
   // do the back action
  }
  else if(whichButton == "Next")
  {
   // do the next action
  }
  else if(whichButton == "Save")
  {
   // do the save action
  }
 
  throw Exception("");
 }
}

Encontrei este artigo de Mark Needham, que utiliza um Dictionary e uso de Generics:

public class SomeController
{
 private Dictionary<string, Func<UserData,ActionResult>> handleAction = 
  new Dictionary<string, Func<UserData,ActionResult>>

{ { "Back", SaveAction },
    { "Next", NextAction },
    { "Save", SaveAction } };
 
 public ActionResult TheAction(string whichButton, UserData userData)
 {
  if(handleAction.ContainsKey(whichButton))
  {
   return handleAction[whichButton](userData);
  }
 
  throw Exception("");
 }
 
 private ActionResult NextAction(UserData userData)
 {
  // do cool stuff
 }
}