using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

using NUnit.Framework; // Throws NUnit.Framework.AssertionException

​

//https://stackoverflow.com/questions/75251361/deserialize-different-items-into-a-list-of-objects-using-newtonsoft-json

​

    public class File

    {

        public string FileName {get; set;} // The Lion King (2019) BluRay 1080p x264 (nItRo)-XpoZ.mkv

        public long FileSize {get; set;} // 1819821931

    }

    class TestClass

    {

        public static void Test()

        {

            var json = GetJson();

            var root = JsonConvert.DeserializeObject<Dictionary<string, Dictionary<string, List<Dictionary<string, File>>>>>(json);

            var newJson = JsonConvert.SerializeObject(root, Formatting.Indented);

            Console.WriteLine("Re-serialized {0}", root);

            Console.WriteLine(newJson);

        }   

        static string GetJson() =>

"""

    {

    "a374e91a9f513c79a8961de7c494cf799bbdb35b": {

        "rd": [

            {

                "1": {

                    "filename": "The Lion King (2019) BluRay 1080p x264 (nItRo)-XpoZ.mkv",

                    "filesize": 1819821931

                }

            }

        ]

    },

    "e999ddbb3e18613476546684e34a4a6b0cfec878": {

        "rd": [

            {

                "1": {

                    "filename": "The.Lion.King.2019.1080p.BluRay.10bit.x265-HazMatt.mkv",

                    "filesize": 4256678521

                }

            }

        ]

    },

    "8bb877768a0780c9694767a655720927e6cda57e": {

        "rd": []

    }

}

""";

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1}), {2}", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , Environment.Version, Environment.OSVersion);

            Console.WriteLine("{0} version: {1}", typeof(JsonSerializer).Namespace, typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​