using System;

using System.Collections.Generic;

using System.Linq;

using Shouldly;

​

public class Program

{

    public class A {

    public int Id {get;set;}

    public string Version {get;set;}

    }

​

    public static void Main()

    {

        var response = new {

            Formats = new List<A>{

            //new A {

            //  Id = 42, Version = "42"

            //}

            }

        };

        var result = response.Formats.SingleOrDefault(x => x.Id == 42);

        result?.Version.ShouldBe("42");

        Console.WriteLine("Hello World");

    }

}