using System;

using System.Text.Json;

using System.Text.Json.Serialization;

​

​

public class Hoge

{

    public int A {get; set;} = 1;

    public int B {get; set;} = 2;

}

​

public record Hoge2(int A = 1, int B = 2);

​

public class Program

{

    public static void Hello(Hoge hoge)

    {

        Console.WriteLine($"Hello! A: {hoge.A}, B: {hoge.B}");

    }

    public static void Hello2(Hoge2 hoge)

    {

        Console.WriteLine($"Hello! A: {hoge.A}, B: {hoge.B}");

    }

    public static void Main()

    {

        Hello(new Hoge{A = 10});

        Hello2(new Hoge2{A = 100});

​

        Hello2(new (1000,2000));

    }

}