using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

using System.Runtime.Serialization.Formatters.Binary;

// https://stackoverflow.com/questions/44608814/serializing-3d-jagged-array-of-a-custom-class-object

​

    [Serializable]

    public class ExampleClass

    {

    }

​

    class TestClass

    {

        public static void Test()

        {

            BinaryFormatter binaryFormatter = new BinaryFormatter();

            using(FileStream fileStream = File.Create("data.dat"))

            {       

                // Initialize the jagged array      

                ExampleClass[][][] exampleClassArray = new ExampleClass[32][][];

                for (int i = 0; i < exampleClassArray.Length; i++)

                {

                    exampleClassArray[i] = new ExampleClass[32][];

                    for (int j = 0; j < exampleClassArray[i].Length; j++)

                    {

                        exampleClassArray[i][j] = new ExampleClass[32];

                    }

                }

                // Populate the jagged array

                for (int i = 0; i < 32; i++)

                {

                    for (int j = 0; j < 32; j++)

                    {

                        for (int k = 0; k < 32; k++)

                        {

                            exampleClassArray[i][j][k] = new ExampleClass();

                        }

                    }

                }

                binaryFormatter.Serialize(fileStream, exampleClassArray);

                fileStream.Close();

            }

            var length = new System.IO.FileInfo("data.dat").Length;

            Console.WriteLine("data.dat length: {0}", length);

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine(string.Format("Environment version: {0}; running on Mono: {1}.", Environment.Version, IsRunningOnMono()));

            Console.WriteLine("");

            TestClass.Test();

        }

        public static bool IsRunningOnMono ()

        {

            // https://stackoverflow.com/questions/721161/how-to-detect-which-net-runtime-is-being-used-ms-vs-mono

            return Type.GetType ("Mono.Runtime") != null;

        }

    }