receiptbuider, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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 rb = new ReceiptBuilder();
            var receipt = rb.WithName("Name")
                .WithDate(DateTime.Now)
                .WithItem("Item1", i => i.WithIngredients("Ingredients1"))
                .WithItem("Item2", i => i.WithIngredients("Ingredients1"))
                .Build();
            Console.WriteLine(receipt);
        }
    }
    
    public class ReceiptBuilder
    {
        private Receipt r;
        
        public ReceiptBuilder()
        {
            r = new Receipt();
        }
        
        public ReceiptBuilder WithName(string name)
        {
            r.Name = name;
            return this;
        }
        
        public ReceiptBuilder WithDate(DateTime dt)
        {
            r.Date = dt;
            return this;
        }
        
        public ReceiptBuilder WithItem(string text, Action<ReceiptItemBuilder> itemBuilder)
        {
            var rib = new ReceiptItemBuilder(text);
            itemBuilder(rib);
            r.AddItem(rib.Build());
            return this;
        }
        
        public Receipt Build()
        {
            return r;
        }
    }
                                       
    public class ReceiptItemBuilder
    {
        private ReceiptItem ri;
        
        public ReceiptItemBuilder(string text)
        {
            ri = new ReceiptItem(text);
        }
        
        public ReceiptItemBuilder WithIngredients(string ings)
        {
            ri.Ingredients = ings;
            return this;
        }
        
        internal ReceiptItem Build()
        {
            return ri;
        }
    }
    
    public class Receipt
    {
        private List<ReceiptItem> items = new List<ReceiptItem>();
        
        public string Name{ get; set; }
        public DateTime Date{get;set;}
        
        public void AddItem(ReceiptItem item)
        {
            this.items.Add(item);
        }
        
        public override string ToString()
        {
            var s =  Name + "\r\n" + Date + "\r\n--------------\r\n";
            foreach(var i in items)
            {
                s += i.ToString() + "\r\n";
            }
            return s;
        }
    }
    
    public class ReceiptItem
    {
        private string text;
        
        public ReceiptItem(string text)
        {
            this.text = text;
        }
        
        public string Ingredients{get; set;}
        
        public override string ToString()
        {
            return this.text + "\r\n" + this.Ingredients;
        }
            
    }
}

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Compilation time: 0,14 sec, absolute running time: 0,09 sec, cpu time: 0,11 sec, average memory usage: 13 Mb, average nr of threads: 3