dotNetStudyWithGPT/MySolution/EF_ChangeLog/Model/Stock.cs

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Threading.Tasks;

namespace EF_ChangeLog.Model
{
    internal class Stock
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public decimal Price { get; set; }

        [NotMapped]
        public string OriginalSnapshot { get; set; }

        public void SaveSnapshot()
        {
            this.OriginalSnapshot = JsonSerializer.Serialize(this);
        }
    }
}