装饰器模式：不会运行

Question

我正在尝试实现装饰器模式，但是当我尝试编译我的程序时，我不断收到错误消息。我不知道为什么。我知道它与不是界面的东西有关，但是我尝试了很多更改，但没有任何效果。我感谢任何帮助！

          using System;
          using System.Collections.Generic;
          using System.Linq;
          using System.Text;
          using System.Threading.Tasks;

          namespace OODAssignment3_ZackDavidson
          {
          class Program
          {
           static void Main(string[] args)
           {
            //Creates a new Calvin Klein Shirt fordecoration
            CalvinKlein ckShirt = new CalvinKlein();
            Console.WriteLine(Convert.ToString(ckShirt.GetBrand()));

            //Puts a solid color on the Calvin Klein Shirt
            solidColorDecorator ckSCD = new solidColorDecorator(ckShirt);

            //Puts stripes on the Calvin Klein Shirt
            stripedShirtDecorator ckSSD = new stripedShirtDecorator(ckShirt);

            //Puts a pocket on the Clavin Klein Shirt
            pocketShirtDecorator ckPSD = new pocketShirtDecorator(ckShirt);

            //Creates a new Tommy Hilfiger Shirt
            TommyHilfiger thShirt = new TommyHilfiger();

            //Puts stripes on the Tommy Hilfiger Shirt
            stripedShirtDecorator thSSD = new stripedShirtDecorator(thShirt);

            //Puts a pocket on the Tommy Hilfiger Shirt
            pocketShirtDecorator thPSD = new pocketShirtDecorator(thShirt); 
        }//EndOfMain
    }//EndOfClassProgram

    public abstract class ShirtsComponent
    {
        public abstract string GetBrand();
        public abstract double GetPrice();
    }

    class CalvinKlein : ShirtsComponent
    {
        private string ck_Brand = "Calvin Klein";
        private double ck_Price = 75.0;

        public override string GetBrand()
        {
            return ck_Brand;
        }

        public override double GetPrice()
        {
            return ck_Price;
        }
    }

    class TommyHilfiger : ShirtsComponent
    {
        private string th_Brand = "Tommy Hilfiger";
        private double th_price = 85.0;

        public override string GetBrand()
        {
            return th_Brand;
        }

        public override double GetPrice()
        {
            return th_price;
        }
    }

    public abstract class Decorator : ShirtsComponent
    {
        ShirtsComponent fashion_Base = null;

        protected string _brand = "Undefined Decorator";
        protected double _price = 0.0;

        protected Decorator(ShirtsComponent fashionBase)
        {
            fashion_Base = fashionBase;
        }

        #region ShirtsComponent Members

        string ShirtsComponent.GetBrand()
        {
            return string.Format("{0}, {1}", fashion_Base.GetBrand(), _brand);
        }

        double ShirtsComponent.GetPrice()
        {
            return _price + fashion_Base.GetPrice();
        }
        #endregion
    }

    class solidColorDecorator : Decorator
    {
        public solidColorDecorator(ShirtsComponent fashionBase)
            : base(fashionBase)
        {
            this._brand = "Solid Color Shirt";
            this._price = 25.0;
        }
    }

    class stripedShirtDecorator : Decorator
    {
        public stripedShirtDecorator(ShirtsComponent fashionBase)
            : base(fashionBase)
        {
            this._brand = "Striped Shirt";
            this._price = 50.0;
        }
    }

    class pocketShirtDecorator : Decorator
    {
        public pocketShirtDecorator(ShirtsComponent fashionBase)
            : base(fashionBase)
        {
            this._brand = "Dotted Shirt";
            this._price = 90.0;
        }
    }

}//EndOfNamespace

Answer 1

这段代码就是问题所在：

    #region ShirtsComponent Members

    string ShirtsComponent.GetBrand()
    {
        return string.Format("{0}, {1}", fashion_Base.GetBrand(), _brand);
    }

    double ShirtsComponent.GetPrice()
    {
        return _price + fashion_Base.GetPrice();
    }
    #endregion

您不需要在方法声明中指定基类。这是正确的代码：

    #region ShirtsComponent Members

    public override string GetBrand()
    {
        return string.Format("{0}, {1}", fashion_Base.GetBrand(), _brand);
    }

    public override double GetPrice()
    {
        return _price + fashion_Base.GetPrice();
    }
    #endregion