using System;

using System.Diagnostics;

using System.IO;

using System.Xml.Serialization;

using System.Collections.Generic;

​

public class Program

{

    private const string filePath = "example.xml";

    private static XmlSerializer xmlSerializer = new XmlSerializer(typeof(XmlData));

    private static XmlData data = new XmlData();

    public static void Main()

    {

        var stopwatch = new Stopwatch();

        // Create some example data with 35000 items

        for(var i = 0; i < 35000; i++)

        {

            data.items.Add(new ItemDefinition());

        }

        // serialize to XML string

        Console.WriteLine("Serialzing into string ....");

        stopwatch.Restart();

        var xml = SaveToXML(data);

        Console.WriteLine($"Finished after {stopwatch.ElapsedMilliseconds} milliseconds");

        Console.WriteLine(xml);

        // deserialize from XML string

        Console.WriteLine("\n\nDeserialzing from string ....");

        stopwatch.Restart();

        data = LoadFromXML(xml);

        Console.WriteLine($"Finished loading {data.items.Count} items after {stopwatch.ElapsedMilliseconds} milliseconds");

        // serialize directly into file (doesn't need to have the enire string in memory)

        Console.WriteLine("\n\nSerialzing into file ....");

        stopwatch.Restart();

        SaveToFile(data);

        Console.WriteLine($"Finished after {stopwatch.ElapsedMilliseconds} milliseconds");

        Console.WriteLine(xml);

        // deseriaize directly from file (doesn't need to have the enire string in memory)

        Console.WriteLine("\n\nDeserialzing from file ....");

        stopwatch.Restart();

        data = LoadFromFile();

        Console.WriteLine($"Finished loading {data.items.Count} items after {stopwatch.ElapsedMilliseconds} milliseconds");;

    }

    private static void SaveToFile(XmlData data)

    {

        using(var stream = File.Open(filePath, FileMode.OpenOrCreate, FileAccess.Write))

        {

            xmlSerializer.Serialize(stream, data);

        }

    }

    private static XmlData LoadFromFile()

    {

        if(!File.Exists(filePath))

        {

            Console.WriteLine("ERROR: File not found!");

            return null;

        }

        using(var stream = File.Open(filePath, FileMode.Open, FileAccess.Read))

        {

            var data = (XmlData) xmlSerializer.Deserialize(stream);

            return data;

        }

    }

    private static string SaveToXML(XmlData data)

    {

        using(var writer = new StringWriter())

        {

            xmlSerializer.Serialize(writer, data);

            return writer.ToString();

        }

    }

    private static XmlData LoadFromXML(string xml)

    {

        using(var reader = new StringReader(xml))

        {

            var data = (XmlData) xmlSerializer.Deserialize(reader);

            return data;

        }

    }

}

​

    [Serializable]

    public class ItemDefinition

    {   

        [XmlAttribute]

        public int size;

        [XmlAttribute]

        public float weight;

        [XmlAttribute]

        public float digit1;

    }

    [Serializable]

    [XmlRoot("xml")]

    public class XmlData

    {

        [XmlElement("item")]

        public List<ItemDefinition> items = new List<ItemDefinition>();

    }