using System;

using System.Linq;

using System.IO;

using System.Runtime.Serialization.Formatters.Binary;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var bytes = SaveFile();

        LoadFile(bytes);

    }

    public static byte[] SaveFile()

    {

        List<object> objects = new List<object>();

​

        // Add all tree nodes

        objects.Add(new List<TreeNode>{new TreeNode{Value = 5}});

​

        // Add dictionary (Type: Dictionary<int, Tuple<List<string>, List<string>>>)

        objects.Add(new Dictionary<int, Tuple<List<string>,List<string>>>(){ {245, null}, {4657, null} });

​

        using(MemoryStream file = new MemoryStream())

        {

            BinaryFormatter bf = new BinaryFormatter();

            bf.Serialize(file, objects);

            file.Flush();

            return file.ToArray();

        }

    }

​

    public static void LoadFile(byte[] bytes)

    {

​

        using(MemoryStream file = new MemoryStream(bytes))

        {

            BinaryFormatter bf = new BinaryFormatter();

​

            object obj = bf.Deserialize(file);

​

            var objects  = obj as List<object>;

​

            var nodes = objects[0] as List<TreeNode>;

            Console.WriteLine(String.Format("TreeNodes in list: {0}. Value of first item: {1}", nodes.Count, nodes[0].Value));

            var dictionary = objects[1] as Dictionary<int, Tuple<List<string>,List<string>>>;

            Console.WriteLine(String.Format("Elements in dictionary: {0}. Value of first key: {1}", dictionary.Count, dictionary.Keys.First()));

​

        }

    }   

}

​

[Serializable]

public class TreeNode

{

    public int Value {get; set;}

}