Builder生成器模式

using System;
using System.Configuration;

namespace Builder
{

 public abstract class House
 {
 }
 public abstract class Windows
 {
 }
 public abstract class Wall
 {
 }
 public abstract class Floor
 {
 }
 public abstract class HouseCeiling
 {
 }

 public abstract class Builder
 {
  public abstract void BuilderDoor();
  public abstract void BuildWindows();
  public abstract void BuildWall();
  public abstract void BuildFloor();
  public abstract void BuildHouseCeiling();

  public abstract House GetHouse();
 }
 /// <summary>
 /// ///////////////////////////////////////////////////////
 /// </summary>

 public class RomainHouse:House
 {
 }
 public class RomainWindows:Windows
 {
 }
 public class RomainWall:Wall
 {
 }
 public class RomainFloor:Floor
 {
 }
 public class RomainHouseCeiling:HouseCeiling
 {
 }
 public class RomainBuilder:Builder
 {
  public override void BuilderDoor()
  {
  }
  public override void BuildWindows()
  {
  }
  public override void BuildWall()
  {
  }
  public override void BuildFloor()
  {
  }
  public override void BuildHouseCeiling()
  {
  }

  public override House GetHouse()
  {
   return new RomainHouse();
  }
 }

 /// <summary>
 /// /////////////////////////////////////////////////////////////////////////////////
 /// 不变的主线
 /// </summary>
 public class GameManager
 {
  public static House CreateHouse(Builder builder)
  {
   builder.BuilderDoor();
   builder.BuilderDoor();

   builder.BuildWall();
   builder.BuildWall();

   builder.BuildWindows();
   builder.BuildWindows();

   builder.BuildHouseCeiling();

   builder.BuildFloor();

   return builder.GetHouse();

  }
 }
 public class Test
 {
  /// <summary>
  /// 用到了动态特指
  /// </summary>
  public static void Main()
  {
   House house;
   string builderName,assemblyName;
   assemblyName=System.Configuration.ConfigurationSettings.AppSettings["AssemblyName"];
   builderName=System.Configuration.ConfigurationSettings.AppSettings["BuilderName"];

   System.Reflection.Assembly assembly = System.Reflection.Assembly.Load(assemblyName);
   Type t=assembly.GetType(builderName);

   Builder builder=(Builder)System.Activator.CreateInstance(t);
   house=GameManager.CreateHouse(builder);
  }
 }
}