using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Serialization;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    static Random rand = new Random();

    public static void Main()

    {

        var appendix = new[] { "1", "2", "3", "Test" };

​

        string input = @"

{

""Addition"": {

""Easy"": [

""Foo"",

""Bar""

]

}

}";

        var item = JsonConvert.DeserializeObject<RootObject>(input);

​

​

        for (int i = 0; i < item.Addition.Easy.Count(); i++)

        {

            item.Addition.Easy[i] = appendix[rand.Next(appendix.Length)] + " " + item.Addition.Easy[i];

        }

​

​

        var jsonResult = JsonConvert.SerializeObject(item, Formatting.Indented);

        Console.WriteLine(jsonResult);

        Console.WriteLine("\n----------------\n");

        var item2 = JsonConvert.DeserializeObject<RootObject>(input);

        var newEasy = item2.Addition.Easy.Select(x => appendix[rand.Next(appendix.Length)] + " " + x).ToList();

        foreach (var text in newEasy)

        {

            Console.WriteLine(text);

​

        }

    }

}

public class Addition

{

    public List<string> Easy { get; set; }

}

​

public class RootObject

{

    public Addition Addition { get; set; }

}