C#装饰器模式(Decorator Pattern)实例教程

public abstract class ProductBase
{
    public abstract string GetName();
    public abstract double GetPrice();
}

public class ConcretProuct : ProductBase
{
    private string _name;
    private double _price;
    public ConcretProuct(string name, double price)
    {
      this._name = name;
      this._price = price;
    }
    public override string GetName()
    {
      return _name;
    }
    public override double GetPrice()
    {
      return _price;
    }
}

public class Decorator : ProductBase
{
    private ProductBase _product = null;
    private string _name;
    private double _price;
    public Decorator(ProductBase product, string name, double price)
    {
      this._product = product;
      this._name = name;
      this._price = price;
    }
    public override string GetName()
    {
      return string.Format("{0},{1}", _product.GetName(), _name);
    }
    public override double GetPrice()
    {
      return _product.GetPrice() + _price;
    }
}

class Program
{
    static void Main(string[] args)
    {
      ConcretProuct livingProduct = new ConcretProuct("平底锅",100);
      Console.WriteLine(PrintProductDetails(livingProduct));
      Decorator dec1 = new Decorator(livingProduct,"海鲜酱油",10);
      Console.WriteLine(PrintProductDetails(dec1));
      Decorator dec2 = new Decorator(dec1, "老坛酸菜",12);
      Console.WriteLine(PrintProductDetails(dec2));
      Console.ReadKey();
    }
    private static string PrintProductDetails(ProductBase product)
    {
      return string.Format("产品组合：{0}   价格：{1}", product.GetName(), product.GetPrice());
    }
}