using System;

using System.Collections.Generic;

using System.Xml.Serialization;

using System.IO;

​

public record ShoppingCart

{

    public virtual List<int> Items

    {

        get;

        set;

    }

​

    //and other properties 

    public void SerializeToXML()

    {

        var xmlSerializer = new XmlSerializer(typeof(ShoppingCart));

        var textWriter = new StringWriter();

        xmlSerializer.Serialize(textWriter, new ShoppingCart(this));

        Console.WriteLine(textWriter.ToString());

    }

}

​

//A cart that is populated by algo based on parameters supplied by user. I have no need to

//persist the actual items across sessions.

public record DynamicCart : ShoppingCart

{

    public override List<int> Items

    {

        get;

        set;

    }

//and other properties 

}

​

public static class Program

{

    static void Main()

    {

        var cart = new DynamicCart{Items = new(){2}};

        Console.WriteLine("serializing sliced:");

        cart.SerializeToXML();

        Console.WriteLine();

        Console.WriteLine("serializing unsliced:");

        var serializer = new XmlSerializer(typeof(DynamicCart));

        TextWriter w = new StringWriter();

        serializer.Serialize(w, cart);

        Console.WriteLine(w.ToString());

    }

}