using System;

using System.Collections.Generic;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var d = new Example

        {

            Version = "2",

            Mangas = new List<Manga>

            {

                new Manga()

                {

                    MangaInfos = new List<object>{ "sample", "manganame", 1234567890, 0, 0 },

                    Chapters = new List<Chapter>

                    {

                        new Chapter()

                        {

                            U = "urlexample",

                            R = 1,

                        },

                        new Chapter()

                        {

                            U = "urlexample",

                            R = 1,

                        },

                        new Chapter()

                        {

                            U = "urlexample",

                            R = 1,

                        },

                    },

                },

            },

        };

        var json = JsonConvert.SerializeObject(d,Formatting.Indented);

        Console.WriteLine(json);

    }

}

​

    public class Chapter

    {

        [JsonProperty("u")]

        public string U { get; set; }

​

        [JsonProperty("r")]

        public int R { get; set; }

    }

​

    public class Manga

    {

        [JsonProperty("manga")]

        public IList<object> MangaInfos { get; set; }

​

        [JsonProperty("chapters")]

        public IList<Chapter> Chapters { get; set; }

    }

​

    public class Example

    {

        [JsonProperty("version")]

        public string Version { get; set; }

​

        [JsonProperty("mangas")]

        public IList<Manga> Mangas { get; set; }

    }

​