using System;

  using System.Collections.Generic;

  // Builder Pattern               judith Bishop November 2007

  // Simple theory code with one director and two builders

  class Director {

    // Builder uses a complex series of steps

    public void Construct(IBuilder builder) {

      builder.BuildPartA();

      builder.BuildPartB();

      builder.BuildPartB();

    }

  }

  interface IBuilder {

    void BuildPartA();

    void BuildPartB();

    Product GetResult();

  }

  class Builder1 : IBuilder {

    private Product product = new Product();

    public  void BuildPartA() {

      product.Add("PartA ");

    }

    public void BuildPartB() {

      product.Add("PartB ");

    }

    public Product GetResult() {

      return product;

    }

  }

  class Builder2 : IBuilder {

    private Product product = new Product();

    public void BuildPartA() {

      product.Add("PartX ");

    }

    public void BuildPartB() {

      product.Add("PartY ");

    }

    public Product GetResult() {

      return product;

    }

  }

  class Product {

    List <string> parts = new List <string> ();

    public void Add(string part) {

      parts.Add(part);

    }

    public void Display() {

      Console.WriteLine("\nProduct Parts -------");

      foreach (string part in parts)

        Console.Write(part);

      Console.WriteLine();

    }

  }

 

  public class Client {

       

    public static void Main() {

      // Create one director and two builders

      Director director = new Director();

      IBuilder b1 = new Builder1();

      IBuilder b2 = new Builder2();

      // Construct two products

      director.Construct(b1);

      Product p1 = b1.GetResult();

      p1.Display();

      director.Construct(b2);

      Product p2 = b2.GetResult();

      p2.Display();

    }

  }

/* Output

Product Parts -------

PartA PartB PartB

Product Parts -------

PartX PartY PartY

*/