C#设计模式之建造者(Builder)模式示例源代码(外摘)

using System;
using System.Collections;

 //product
 public class Computer
 {
  private string Type;
  private Hashtable info=new Hashtable ();
  public Computer(string type)
  {
   Type=type;
   Console .WriteLine ("Conputer "+type+" is Builded!");
  }

  public string this[string key]
  {
   get
   {
    return (string)info[key];
   }
   set
   {
    info[key]=value;
   }
  }
  public void Show()
  {
   Console .WriteLine ("this is a computer of "+Type+" :");
   Console .WriteLine ("   "+info["cpu"]);
   Console .WriteLine ("   "+info["ram"]);
  }
 }

//Builder
public abstract class Builder
{
 protected Computer computer;

 public Computer Computpter
 {
  get
  {
   return computer;
  }
 }
 public Builder(string type)
 {
 computer=new Computer (type);
 }
 abstract public void BuildCpu();
 abstract public  void BuilderRam();
 
}

public class MacBuilder:Builder
{
 public MacBuilder(string type):base(type)
 {}
 public override void BuildCpu()
 {
  computer["cpu"]="MacCpu";
 }
 public override void BuilderRam()
 {
  computer["ram"]="MacCpu";
 }

}

public class pcBuilder:Builder
{
 public pcBuilder(string type):base(type)
 {}
 public override void BuildCpu()
 {
  computer["cpu"]="pcCpu";
 }
 public override void BuilderRam()
 {
  computer["ram"]="pcCpu";
 }

}

public class Worker
{
 public void Construct(Builder builder)
 {
 
 builder.BuildCpu();
 builder.BuilderRam();
 }
}

public  class CEO
{

 public static void Main()
 {
  try
  {
   Worker Worker=new Worker ();
   Builder PcBuilder=new pcBuilder ("Pc");
   Builder MacBuilder=new MacBuilder ("Mac");
  
   Worker .Construct(PcBuilder);
   Worker.Construct(MacBuilder);

   PcBuilder.Computpter.Show ();
   MacBuilder.Computpter.Show ();
  }
  catch(Exception ex)
  {
  Console.WriteLine ("Error:"+ex.Source+" "+ex.InnerException+ex.StackTrace+ex.TargetSite);
  }

 }
}