#region 坦克系列

    abstract class Tank

    {

        abstract public void Go();

    }

    /// <summary>

    /// 越野车

    /// </summary>

    class YueyeTank : Tank

    {

        public override void Go()

        {

            Console.WriteLine("我是一颗中国造越野车，来踏平不老实的小邪恶国家！");

        }

    }

    /// <summary>

    /// 主站坦克

    /// </summary>

    class ZhuzhanTank : Tank

    {

        public override void Go()

        {

            Console.WriteLine("我是一颗中国造主站坦克，来踏平不老实的小邪恶国家！");

        }

    }

    #endregion

 #region 炸弹系列

    abstract class Bomb

    {

        abstract public void BaoZha();

    }

    /// <summary>

    /// 导弹

    /// </summary>

    class DaodanBomb : Bomb

    {

        public override void BaoZha()

        {

            Console.WriteLine("我是一颗中国造导弹，来轰炸不老实的小邪恶国家！");

        }

    }

    /// <summary>

    /// 核弹

    /// </summary>

    class HedanBomb : Bomb

    {

        public override void BaoZha()

        {

            Console.WriteLine("我是一颗中国造核弹，来轰炸不老实的小邪恶国家！");

        }

    }

    #endregion

 // 备战

    class Make

    {

        //装备

        private Bomb bomb;

        private Tank tank;

        //制造加工

        public Make(ChinaFactory factory)

        {

            bomb = factory.CreateBomb();

            tank = factory.CreateTank();

        }

        //开始打仗

        public void WarStar()

        {

            //炸弹类爆炸

            bomb.BaoZha();

            //战车类前进

            tank.Go();

        }

    }

 #region 中国兵工厂

    abstract class ChinaFactory

    {

        //装甲车制造车间

        public abstract Tank CreateTank();

        //炸弹知道车间

        public abstract Bomb CreateBomb();

    }

    //兵工厂前期制造

    class QianqiFactory : ChinaFactory

    {

        public override Bomb CreateBomb()

        {

            //导弹

            return new DaodanBomb();

        }

        public override Tank CreateTank()

        {

            //越野车

            return new YueyeTank();

        }

    }

    //兵工厂后期制造

    class HouqiFactory : ChinaFactory

    {

        public override Bomb CreateBomb()

        {

            //核弹

            return new HedanBomb();

        }

        public override Tank CreateTank()

        {

            //主站坦克

            return new ZhuzhanTank();

        }

    }

    #endregion

  class Program

    {

        static void Main(string[] args)

        {

            //大战前期

            ChinaFactory qianqiMake = new QianqiFactory();

            Make qianqi = new Make(qianqiMake);

            qianqi.WarStar();

            //点任意键，进行后期攻势！！

            Console.ReadKey();

            //大战后期

            ChinaFactory houqiMake = new HouqiFactory();

            Make houqi = new Make(houqiMake);

            houqi.WarStar();

            Console.WriteLine("钓鱼岛是中国的，神圣不可侵犯！小邪恶国家，滚开！！");

            Console.ReadLine();

        }

    }

/// 扮演抽象工厂的角色

/// 创建连接数据库时所需要的对象集合，

/// 这个对象集合包括有 DbConnection对象（这个是抽象产品类,如绝味例子中的YaBo类）、DbCommand类、DbDataAdapter类，针对不同的具体工厂都需要实现该抽象类中方法，

public abstract class DbProviderFactory

{

  // 提供了创建具体产品的接口方法

  protected DbProviderFactory();

  public virtual DbCommand CreateCommand();

  public virtual DbCommandBuilder CreateCommandBuilder();

  public virtual DbConnection CreateConnection();

  public virtual DbConnectionStringBuilder CreateConnectionStringBuilder();

  public virtual DbDataAdapter CreateDataAdapter();

  public virtual DbDataSourceEnumerator CreateDataSourceEnumerator();

  public virtual DbParameter CreateParameter();

  public virtual CodeAccessPermission CreatePermission(PermissionState state);

}

DbProviderFactory类是一个抽象工厂类，该类提供了创建数据库连接时所需要的对象集合的接口，实际创建的工作在其子类工厂中进行，微软使用的是SQL Server数据库，因此提供了连接SQL Server数据的具体工厂实现，具体代码可以用反编译工具查看，具体代码如下：

/// 扮演着具体工厂的角色，用来创建连接SQL Server数据所需要的对象

public sealed class SqlClientFactory : DbProviderFactory, IServiceProvider

{

  // Fields

  public static readonly SqlClientFactory Instance = new SqlClientFactory();

  // 构造函数

  private SqlClientFactory()

  {

  }

  // 重写抽象工厂中的方法

  public override DbCommand CreateCommand()

  { // 创建具体产品

    return new SqlCommand();

  }

  public override DbCommandBuilder CreateCommandBuilder()

  {

    return new SqlCommandBuilder();

  }

  public override DbConnection CreateConnection()

  {

    return new SqlConnection();

  }

  public override DbConnectionStringBuilder CreateConnectionStringBuilder()

  {

    return new SqlConnectionStringBuilder();

  }

  public override DbDataAdapter CreateDataAdapter()

  {

    return new SqlDataAdapter();

  }

  public override DbDataSourceEnumerator CreateDataSourceEnumerator()

  {

    return SqlDataSourceEnumerator.Instance;

  }

  public override DbParameter CreateParameter()

  {

    return new SqlParameter();

  }

  public override CodeAccessPermission CreatePermission(PermissionState state)

  {

    return new SqlClientPermission(state);

  }

}