xml 序列化

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Serialization;
using System.IO;

namespace SerializableTest
{
    class Programaa
    {
       
        public void SerializeDocument()
        {
            string filename = "e:\\books.xml";
            //　Creates　a　new　XmlSerializer.
            XmlSerializer s =
            new XmlSerializer(typeof(MyRootClass));

            //　Writing　the　file　requires　a　StreamWriter.
            TextWriter myWriter = new StreamWriter(filename);

            //　Creates　an　instance　of　the　class　to　serialize.　
            MyRootClass myRootClass = new MyRootClass();

            /*　Uses　a　more　advanced　method　of　creating　an　list:
         create　instances　of　the　Item　and　BookItem,　where　BookItem　
         is　derived　from　Item.　*/
            Item item1 = new Item();
            //　Sets　the　objects'　properties.
            item1.ItemName = "Widget1";
            item1.ItemCode = "w1";
            item1.ItemPrice = 231;
            item1.ItemQuantity = 3;

            BookItem bookItem = new BookItem();
            //　Sets　the　objects'　properties.
            bookItem.ItemCode = "w2";
            bookItem.ItemPrice = 123;
            bookItem.ItemQuantity = 7;
            bookItem.ISBN = "34982333";
            bookItem.Title = "Book　of　Widgets";
            bookItem.Author = "John　Smith";

            //　Sets　the　class's　Items　property　to　the　list.
            myRootClass.Items.Add(item1);
            myRootClass.Items.Add(bookItem);

            /*　Serializes　the　class,　writes　it　to　disk,　and　closes　
               the　TextWriter.　*/
            s.Serialize(myWriter, myRootClass);
            myWriter.Close();
        }

        public MyRootClass DeSerialize()
        {
            TextReader reader = new StreamReader("e:\\books.xml");
            XmlSerializer serializer =
           new XmlSerializer(typeof(MyRootClass));
            var myBooks = (MyRootClass)serializer.Deserialize(reader);
            reader.Close();
            return myBooks;
        }

    }

    //　This　is　the　class　that　will　be　serialized.
    [Serializable]
    public class MyRootClass
    {
        public MyRootClass()
        {
            items = new List<Item>();
        }

        private List<Item> items;

        [XmlArrayItem(ElementName = "Item",
   IsNullable = true,
   Type = typeof(Item)),
   XmlArrayItem(ElementName = "BookItem",
   IsNullable = true,
   Type = typeof(BookItem))]

        public List<Item> Items
        {
            get { return items; }
            set { items = value; }
        }
    }

    public class Item
    {
        [XmlElement(ElementName = "OrderItem")]
        public string ItemName;
        public string ItemCode;
        public decimal ItemPrice;
        public int ItemQuantity;
    }

    public class BookItem : Item
    {
        public string Title;
        public string Author;
        public string ISBN;
    }



}

http://tech.ddvip.com/2010-03/1268192963146672_3.html

http://msdn.microsoft.com/en-us/library/ms950721.aspx