using System;

using System.Collections.Generic;

using System.Linq;

using System.Xml.Linq;

​

public class Program

{

    public static void Main()

    {

        const string xml = @"<myXML>

    <MyGroup>

        <source>OCU</source> 

        <endianity>

            <set>LITTLE</set><!--LITTLE/BIG Endian-->

        </endianity>

       <msgNumber>

          <Number>5</Number>

          <Field>

            <name>Pos_X</name>

            <entry>

                 <ByteOffset>

                    <offset>8</offset>

                 </ByteOffset>

                 <ByteSize>

                    <Size>4</Size>

                 </ByteSize>

            </entry>

          </Field>

          <Field>

            <name>Pos_Y</name>

            <entry>

                 <ByteOffset>

                    <offset>12</offset>

                 </ByteOffset>

                 <ByteSize>

                    <Size>4</Size>

                 </ByteSize>

            </entry>

          </Field>

       </msgNumber>

    </MyGroup>

</myXML>";

​

        var doc = XDocument.Parse(xml);

​

        var msgs =

            from msg in doc.Descendants("msgNumber")

            select new Message

            {

                Number = (int) msg.Element("Number"),

                Fields = msg

                    .Elements("Field")

                    .Select(x => new Field

                    {

                        Name = (string) x.Element("name"),

                        ByteOffset = (int) x.Descendants("offset").Single(),

                        ByteSize = (int) x.Descendants("Size").Single(),

                    })

                    .ToList()

            };

​

        foreach (var msg in msgs)

        {

            Console.WriteLine("Msg: {0}", msg.Number);

​

            foreach (var field in msg.Fields)

            {

                Console.WriteLine("{0}: Offset {1} Size {2}", field.Name, field.ByteOffset, field.ByteSize);

            }

        }

    }

}

​

public class Message

{

    public int Number { get; set; }

    public List<Field> Fields { get; set; }

}

​

public class Field

{

    public string Name { get; set; }

    public int ByteOffset { get; set; }

    public int ByteSize { get; set; }

}