Bagaimana untuk Mensiri dan Menyahseri Kamus kepada XML Tersuai Tanpa Menggunakan XElement?

<items>
  <item>

public class Item
{
    [XmlAttribute]
    public int Id;
    [XmlAttribute]
    public string Value;
}

Dictionary<int, string> dict = new Dictionary<int, string>()
{
    { 1, "one" }, { 2, "two" }
};

XmlSerializer serializer = new XmlSerializer(typeof(Item[]), new XmlRootAttribute() { ElementName = "items" });

serializer.Serialize(stream, dict.Select(kv => new Item() { Id = kv.Key, Value = kv.Value }).ToArray());

var orgDict = ((Item[])serializer.Deserialize(stream))
               .ToDictionary(i => i.Id, i => i.Value);

XElement xElem = new XElement(
                    "items",
                    dict.Select(x => new XElement("item", new XAttribute("id", x.Key), new XAttribute("value", x.Value)))
                 );
var xml = xElem.ToString(); //xElem.Save(...);

XElement xElem2 = XElement.Parse(xml); //XElement.Load(...)
var newDict = xElem2.Descendants("item")
                    .ToDictionary(x => (int)x.Attribute("id"), x => (string)x.Attribute("value"));