/// <summary>
  /// 抽象工廠，聲明了一個創(chuàng)建Product的方法
  /// </summary>
  public abstract class Creator
  {
    /// <summary>
    /// 該方法用來返回Product產(chǎn)品
    /// </summary>
    /// <returns></returns>
    public abstract Product CreateProduct();
  }

  /// <summary>
  /// 具體產(chǎn)工廠，產(chǎn)品類 A 的創(chuàng)建者，繼承自抽象工廠Creator
  /// </summary>
  public class ProductACreator : Creator
  {
    public override Product CreateProduct()
    {
      return new ConcreteProductA();
    }
  }

  /// <summary>
  /// 具體產(chǎn)工廠，產(chǎn)品類 B 的創(chuàng)建者，繼承自抽象工廠Creator
  /// </summary>
  public class ProductBCreator : Creator
  {
    public ProductBCreator() { }

    public override Product CreateProduct()
    {
      return new ConcreteProductB();
    }
  }

  /// <summary>
  /// 抽象產(chǎn)品，定義工廠方法中所創(chuàng)建的對象
  /// </summary>
  public abstract class Product
  {
    public Product()
    { }

    public abstract void Opration();
  }

  /// <summary>
  /// 具體產(chǎn)品A，繼承自Product
  /// </summary>
  public class ConcreteProductA : Product
  {
    public ConcreteProductA() { }

    public override void Opration()
    {
      // This is product A
    }
  }

  /// <summary>
  /// 具體產(chǎn)品B，繼承自Product
  /// </summary>
  public class ConcreteProductB : Product
  {
    public ConcreteProductB() { }

    public override void Opration()
    {
      // This is product B
    }
  }