Builder Design Pattern, C#

Builder Design Pattern

//Builder design pattern

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        
        public static void Main(string[] args)
        {
            var maker = new SandwichMaker(new MySandwichBuilder());
            maker.BuildSandwich();
            var sandwich = maker.GetSandwich();
            sandwich.Display();
            
               
        }
        public class SandwichMaker
        {
            private readonly SandwichBuilder builder;
            public SandwichMaker(SandwichBuilder builder)
            {
                this.builder = builder;
            }
            public void BuildSandwich()
            {
                builder.CreateNewSandwich();
                builder.PrepareBread();
                builder.AddMeat();
                builder.AddChees();
            }
            public Sandwich GetSandwich()
            {
                return builder.GetSandwich();
            }
            
            
        }
        public abstract class SandwichBuilder
        {
            protected Sandwich sandwich;
            public void CreateNewSandwich()
            {
                sandwich = new Sandwich();
            }
            public Sandwich GetSandwich()
            {
                return sandwich;
            }
            public abstract void PrepareBread();
            public abstract void AddMeat();
            public abstract void AddChees();
        }
        public class MySandwichBuilder : SandwichBuilder
        {
            public override void PrepareBread()
            {
                sandwich.BreadType = BreadType.Black;
                sandwich.IsGrilled = false;
            }
            public override void AddMeat()
            {
                sandwich.MeatType = "Szynka";
            }
            public override void AddChees()
            {
                sandwich.CheesType = "Cheddar";
            }
        }
        public class YourSandwichBuilder : SandwichBuilder
        {
            public override void PrepareBread()
            {
                sandwich.BreadType = BreadType.White;
                sandwich.IsGrilled = true;
            }
            public override void AddMeat()
            {
                sandwich.MeatType = "Szynka";
            }
            public override void AddChees()
            {
                sandwich.CheesType = "Cheddar";
            }
        }
        public class Sandwich
        {
            public BreadType BreadType{get; set;}
            public string MeatType{get;set;}
            public string CheesType{get;set;}
            public bool IsGrilled{get; set;}
            public void Display()
            {
                Console.WriteLine(BreadType);
                Console.WriteLine(MeatType);
                Console.WriteLine(CheesType);
                if (IsGrilled) Console.WriteLine("Grilled");
                else Console.WriteLine("Not grilled");
            }
                
                
        }
        public enum BreadType
        {
            White,
            Black
        }
    }
}


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