Строитель (Builder)

using System;
using System.Text;
using System.Threading;
using System.Linq;

class Program
{
   static void Main(string[] args)
   {
    Baker bake = new Baker();
    BreadBuilder builder = new RyeBreadBuilder();
    Bread ryeBread = bake.Bake(builder);
    Console.WriteLine(ryeBread.ToString());

    builder = new WheatBreadBuilder();
    Bread wheatBread = bake.Bake(builder);
    Console.WriteLine(wheatBread.ToString());

    Console.ReadLine();
   }
}

abstract class BreadBuilder
{
    public Bread Bread{get;private set;}
    public void CreateBread()
    {
        Bread = new Bread();
    }
    public abstract void SetFlour();
    public abstract void SetSalt();
    public abstract void SetAdditives();
}

class Baker
{
    public Bread Bake(BreadBuilder breadBuilder)
    {
        breadBuilder.CreateBread();
        breadBuilder.SetFlour();
        breadBuilder.SetSalt();
        breadBuilder.SetAdditives();
        return breadBuilder.Bread;
    }
}

class RyeBreadBuilder: BreadBuilder
{
    public override void SetFlour()
    {
        this.Bread.flour = new Flour{Sort = "Ржаная мука I сорт"};
    }

    public override void SetSalt()
    {
        this.Bread.salt = new Salt();
    }

    public override void SetAdditives()
    {

    }
}

class WheatBreadBuilder: BreadBuilder
{
    public override void SetFlour()
    {
        this.Bread.flour = new Flour{Sort = "Пшеничная мука I сорт"};
    }

    public override void SetSalt()
    {
        this.Bread.salt = new Salt();
    }

    public override void SetAdditives()
    {
        this.Bread.addinives = new Additives{Name = "Улучшитель хлебопекарный"};
    }
}



class Flour
{
    public string Sort{get;set;}
}

class Salt
{

}

class Additives
{
    public string Name{get;set;}
}

class Bread
{
    public Flour flour {get;set;}

    public Salt salt {get;set;}

    public Additives addinives {get;set;}

    public override string ToString()
    {
        var sb = new StringBuilder();

        if(flour != null)
            sb.Append(flour.Sort + Environment.NewLine);
        if(salt != null)
            sb.Append("Соль" + Environment.NewLine);
        if(addinives != null)
            sb.Append(addinives.Name + Environment.NewLine);

        return sb.ToString();
    }

}