C# 代理模式

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// See https://aka.ms/new-console-template for more information /*个人理解   Girl:实际要东西的人   Middlemen:帮助Girl买她要的东西  */ Person middlemen   = new Middlemen(); middlemen.BuyPhone(); middlemen.BuyPhoneCard();   public abstract class Person {     public abstract void BuyPhone();     public abstract void BuyPhoneCard() ; }   public class Girl : Person {     public override void BuyPhone()     {         Console.WriteLine("我要买小米手机");     }       public override void BuyPhoneCard()     {         Console.WriteLine("我要买小米手机卡");     }   }   //Proxy 中间商 public class Middlemen : Person {     Girl girl;     public Middlemen()     {         if (girl is null)         {             girl = new();         }         girl.BuyPhone();         girl.BuyPhoneCard();     }     public override void BuyPhone()     {         Console.WriteLine("中间商卖小米手机");     }       public override void BuyPhoneCard()     {         Console.WriteLine("中间商卖小米手机卡");     } }