การแปลงเป็น JSON

using System;
using System.Text.Json;

record Product(string Name, decimal Price);

class Program
{
    static void Main()
    {
        var json = JsonSerializer.Serialize(new Product("Book", 12.5m));
        var product = JsonSerializer.Deserialize<Product>(json);
        Console.WriteLine($"{product?.Name}: {product?.Price}");
    }
}