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using System;
 using System.Collections.Generic;
 namespace Builder
 {
  public class MainApp
  {
    public static void Main()
    {
      // Create director and builders
      Director director = new Director();
 
      Builder b1 = new ConcreteBuilder1();
      Builder b2 = new ConcreteBuilder2();
 
      // Construct two products
      director.Construct(b1);
      Product p1 = b1.GetResult();
      p1.Show();
 
      director.Construct(b2);
      Product p2 = b2.GetResult();
      p2.Show();
 
      // Wait for user
      Console.Read();
    }
  }
  // "Director"
  class Director
  {
    // Builder uses a complex series of steps
    public void Construct(Builder builder)
    {
      builder.BuildPartA();
      builder.BuildPartB();
    }
  }
  // "Builder"
  abstract class Builder
  {
    public virtual void BuildPartA(){}
    public virtual void BuildPartB(){}
    public virtual Product GetResult(){}
  }
  // "ConcreteBuilder1"
  class ConcreteBuilder1 : Builder
  {
    private readonly Product product = new Product();
    public override void BuildPartA()
    {
      product.Add("PartA");
    }
    public override void BuildPartB()
    {
      product.Add("PartB");
    }
    public override Product GetResult()
    {
      return product;
    }
  }
  // "ConcreteBuilder2"
  class ConcreteBuilder2 : Builder
  {
    private readonly Product product = new Product();
    public override void BuildPartA()
    {
      product.Add("PartX");
    }
    public override void BuildPartB()
    {
      product.Add("PartY");
    }
    public override Product GetResult()
    {
      return product;
    }
  }
  // "Product"
  class Product
  {
    private readonly List<string> parts = new List<string>();
    public void Add(string part)
    {
      parts.Add(part);
    }
    public void Show()
    {
      Console.WriteLine("\nProduct Parts -------");
      foreach (string part in parts)
        Console.WriteLine(part);
    }
  }
 }







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