建造者模式

         將一個複雜對象的構建與它的表示分離,使得同樣的構建過程可以創建不同的表示;

         使用構建者模式,又稱生成器模式,用戶就只需要指定 需要建造的類型,就可以得到他們,而具體的建造過程和細節就不需要知道了;

實現代碼：

/// <summary>
    /// 具體產品類
    /// </summary>
    public class Product
    {
        IList<string> parts = new List<string>();

        public void Add(string part)
        {
            parts.Add(part);
        }

        public void show()
        {
            Console.WriteLine("--------------------------");
            foreach (string part in parts)
            {
                Console.WriteLine(part);
            }
        }
    }

    /// <summary>
    /// Builder類
    /// </summary>
    public abstract class Builder
    {
        public abstract void BuilderPartA();
        public abstract void BuilderPartB();
        public abstract Product GetResult();
    }

    /// <summary>
    /// 建造產品類1
    /// </summary>
    public class ConcreteBuilderOne : Builder
    {
        private Product product = new Product();

        public override void BuilderPartA()
        {
            product.Add("部件A");
        }

        public override void BuilderPartB()
        {
            product.Add("部件B");
        }

        public override Product GetResult()
        {
            return product;
        }
    }

    /// <summary>
    /// 建造產品類2
    /// </summary>
    public class ConcreteBuilderTwo : Builder
    {
        private Product product = new Product();

        public override void BuilderPartA()
        {
            product.Add("部件X");
        }

        public override void BuilderPartB()
        {
            product.Add("部件Y");
        }

        public override Product GetResult()
        {
            return product;
        }
    }

    /// <summary>
    /// 指揮者類
    /// </summary>
    public class Director
    {
        public void Construct(Builder builder)
        {
            builder.BuilderPartA();
            builder.BuilderPartB();
        }
}

客戶端訪問代碼：

        Director director = new Director();
        Builder b1 = new ConcreteBuilderOne();
        Builder b2 = new ConcreteBuilderTwo();

        director.Construct(b1);
        Product p1 = b1.GetResult();
        p1.show();