外觀模式(Facade)

using System;

namespace DPExample
{
 public class Stock1
 {
  public void Sell()
  {
   Console.WriteLine (" 股票1賣出");
  }

  public void Buy()
  {
   Console.WriteLine (" 股票1買進");
  }
 }

 public class Stock2
 {
  public void Sell()
  {
   Console.WriteLine (" 股票2賣出");
  }

  public void Buy()
  {
   Console.WriteLine (" 股票2買進");
  }
 }

 public class NationalDebt1
 {
  public void Sell()
  {
   Console.WriteLine (" 公債1賣出");
  }

  public void Buy()
  {
   Console.WriteLine (" 公債1買進");
  }
 }

 public class Realty1
 {
  public void Sell()
  {
   Console.WriteLine (" 房地產1賣出");
  }

  public void Buy()
  {
   Console.WriteLine (" 房地產1買進");
  }
 }

 class Fund
 {
  Stock1 s1;
  Stock2 s2;
  NationalDebt1 n1;
  Realty1 r1;

  public Fund()
  {
   s1 = new Stock1();
   s2 = new Stock2();
   n1 = new NationalDebt1();
   r1 = new Realty1();
  }

  public void BuyFund()
  {
   s1.Buy();
   s2.Buy();
   n1.Buy ();
   r1.Buy ();
  }

  public void SellFund()
  {
   s1.Sell ();
   s2.Sell ();
   n1.Sell ();
   r1.Sell ();
  }
 }
}