using System;

using System.IO;

using System.Xml.Serialization;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    [XmlRoot(ElementName="param")]

    public class Param {

        [XmlAttribute(AttributeName="name")]

        public string Name { get; set; }

        [XmlText]

        public string Text { get; set; }

        [XmlAttribute(AttributeName="unit")]

        public string Unit { get; set; }

    }

​

    [XmlRoot(ElementName="item")]

    public class Item {

        [XmlElement(ElementName="group")]

        public string Group { get; set; }

        [XmlElement(ElementName="param")]

        public List<Param> Params { get; set; }

        [XmlElement(ElementName="price")]

        public string Price { get; set; }

        [XmlElement(ElementName="name")]

        public string Name { get; set; }

        [XmlAttribute(AttributeName="id")]

        public string Id { get; set; }

    }

​

    [XmlRoot(ElementName="items")]

    public class Items {

        [XmlElement(ElementName="item")]

        public List<Item> Item { get; set; }

    }

    public static void Main()

    {

        string xml = @"<items>

   <item id=""1"">

      <group>1</group>

      <param name=""Width"">100</param>

      <param name=""Length"">100</param>

      <price>100</price>

      <name>Name 1</name>

      <param name=""Weight"" unit=""gr"">100</param>

   </item>

​

   <item id=""2"">

      <group>1</group>

      <param name=""Width"">200</param>

      <param name=""Length"">200</param>

      <price>200</price>

      <name>Name 2</name>

      <param name=""Weight"" unit=""gr"">200</param>

   </item>

​

   <item id=""3"">

      <group>3</group>

      <price>300</price>

      <name>Name 3</name>

      <param name=""Weight"" unit=""lbs"">300</param>

   </item>

</items>";

        XmlSerializer xmlSerializer = new XmlSerializer(typeof(Items));

        var items = (Items)xmlSerializer.Deserialize(new StringReader(xml));

        Console.WriteLine(string.Format("is param not empty : {0}", items.Item.First().Params.Count == 3));

    }

}