C#面向对象设计模式纵横谈——4. Builder生成器模式

主讲：李建忠

来源：http://www.microsoft.com/china/msdn/events/webcasts/shared/webcast/consyscourse/CsharpOOD.aspx

 

 

Builderpublic abstract class House

{



}



public abstract class Door

{



}



public abstract class Wall

{



}



public abstract class Windows

{



}



public abstract class Floor

{



}



public abstract class HouseCeiling

{



}



public abstract class HouseBuilder

{

  //房屋的各个部分

  public abstract void BuildDoor();

  public abstract void BuildWall();

  public abstract void BuildWindows();

  public abstract void BuildFloor();

  public abstract void BuildHouseCeiling();



  public abstract House GetHouse();



}

GameManagerpublic class GameManager

{

  //构造房屋（复杂对象）的算法

  public static House CreateHouse(Builder builder)

  {

    //部分对象构造的次数可以通过数据库或配置文件来控制

    builder.BuildDoor();

    builder.BuildDoor();



    builder.BuildWall();

    builder.BuildWall();



    builder.BuildWindows();

    builder.BuildWindows();



    builder.BuildFloor();

    builder.BuildHouseCeiling();



    return builder.GetHouse();

  }

}

RomanHouseBuilderpublic class RomanHouse:House

{



}



public class RomanDoor:Door

{



}



public class RomanWall:Wall

{



}



public class RomanWindows:Windows

{



}



public class RomanFloor:Floor

{



}



public class RomanHouseCeiling:HouseCeiling

{



}



public class RomanHouseBuilder:HouseBuilder

{

  public override void BuildDoor()

  {



  }

  public override void BuildWall()

  {



  }

  public override void BuildWindows()

  {



  }

  public override void BuildFloor()

  {



  }

  public override void BuildHouseCeiling()

  {



  }



  public override House GetHouse()

  {



  }

}

Clientclass App

{

  public static void Main()

  {

    //对于风格的变化（罗马风格或经典风格），可以通过配置文件+动态反射来解决

    string assemblyName=configurationSetting["BuilderAssembly"];

    string builderName=configurationSetting["BuilderClass"];

    Assembly assembly=Assembly.Load(assemblyName);    

    Type t=assembly.GetType("builderName");



    Builder builder=Activator.CreateInstance(t);



    House house=GameManager.CreateHouse(new RomanHouseBuilder());

  }

}