c# - What is the simplest way to change the behavior of a method during runtime? -

I have a class named enemy , and I want many types of enemies, each enemy will have different movement behaviors, for example, can be directly transferred directly to the player, maintain a certain distance, etc. What would I want to know, what is different behavior, preferably in a class?

My current idea is to use a switch , and to include all the behaviors in a method

  public class enemy {full public} Health; Public damage; // etc etc go public zero (string type) {switch (type) {case "charge": chargeMove (); break; "Maintain" the case: keep uphold (); break; }} Private Zero Charges () {// Luggage} Maintaining Private Zero () {// Accessories} // All Behavior}   
 What should I know, is it better to do this To put everything in a function, or to create a new class for each code that comes from  Enemy ? I would like to keep it in a square, so that all enemies can be well stored in  ilist  without using any castings to use any particular task.  
 Any advice would be appreciated.  
 EDIT: Thanks for all the responses, I think I will use the proposed interface method by Alastair.   
 
 
 However, this may be better suited on this site, Consider using it.  
 A movement statement. E.g.    Public Interface ImpexBeihara {Move zero (Enemy enemy); }   
 So you will have many different behaviors that describe different movements. for example.  
  Public class chargingActivator: IMovementBehavior {...} Keeping public squares should be used: ImovementBehavior {...}   
 then your enemy constructor may have Like Defniniton:  
  Public enemies (IMVEIFTBehavior MovementBehavior) {...}   
 This means that you can easily do different movement behaviors Can