.net 读写XML

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

// 此处代码来源于博客【在.net中读写config文件的各种方法】的示例代码
// http://www.cnblogs.com/fish-li/archive/2011/12/18/2292037.html

namespace MyMVC
{
    public static class XmlHelper
    {
        private static void XmlSerializeInternal(Stream stream, object o, Encoding encoding)
        {
            if( o == null )
                throw new ArgumentNullException("o");
            if( encoding == null )
                throw new ArgumentNullException("encoding");

            XmlSerializer serializer = new XmlSerializer(o.GetType());

            XmlWriterSettings settings = new XmlWriterSettings();
            settings.Indent = true;
            settings.NewLineChars = "\r\n";
            settings.Encoding = encoding;
            settings.IndentChars = "    ";

            using( XmlWriter writer = XmlWriter.Create(stream, settings) ) {
                serializer.Serialize(writer, o);
                writer.Close();
            }
        }

        /// <summary>
        /// 将一个对象序列化为XML字符串
        /// </summary>
        /// <param name="o">要序列化的对象</param>
        /// <param name="encoding">编码方式</param>
        /// <returns>序列化产生的XML字符串</returns>
        public static string XmlSerialize(object o, Encoding encoding)
        {
            using( MemoryStream stream = new MemoryStream() ) {
                XmlSerializeInternal(stream, o, encoding);

                stream.Position = 0;
                using( StreamReader reader = new StreamReader(stream, encoding) ) {
                    return reader.ReadToEnd();
                }
            }
        }

        /// <summary>
        /// 将一个对象按XML序列化的方式写入到一个文件
        /// </summary>
        /// <param name="o">要序列化的对象</param>
        /// <param name="path">保存文件路径</param>
        /// <param name="encoding">编码方式</param>
        public static void XmlSerializeToFile(object o, string path, Encoding encoding)
        {
            if( string.IsNullOrEmpty(path) )
                throw new ArgumentNullException("path");

            using( FileStream file = new FileStream(path, FileMode.Create, FileAccess.Write) ) {
                XmlSerializeInternal(file, o, encoding);
            }
        }

        /// <summary>
        /// 从XML字符串中反序列化对象
        /// </summary>
        /// <typeparam name="T">结果对象类型</typeparam>
        /// <param name="s">包含对象的XML字符串</param>
        /// <param name="encoding">编码方式</param>
        /// <returns>反序列化得到的对象</returns>
        public static T XmlDeserialize<T>(string s, Encoding encoding)
        {
            if( string.IsNullOrEmpty(s) )
                throw new ArgumentNullException("s");
            if( encoding == null )
                throw new ArgumentNullException("encoding");

            XmlSerializer mySerializer = new XmlSerializer(typeof(T));
            using( MemoryStream ms = new MemoryStream(encoding.GetBytes(s)) ) {
                using( StreamReader sr = new StreamReader(ms, encoding) ) {
                    return (T)mySerializer.Deserialize(sr);
                }
            }
        }

        /// <summary>
        /// 读入一个文件，并按XML的方式反序列化对象。
        /// </summary>
        /// <typeparam name="T">结果对象类型</typeparam>
        /// <param name="path">文件路径</param>
        /// <param name="encoding">编码方式</param>
        /// <returns>反序列化得到的对象</returns>
        public static T XmlDeserializeFromFile<T>(string path, Encoding encoding)
        {
            if( string.IsNullOrEmpty(path) )
                throw new ArgumentNullException("path");
            if( encoding == null )
                throw new ArgumentNullException("encoding");

            string xml = File.ReadAllText(path, encoding);
            return XmlDeserialize<T>(xml, encoding);
        }
    }
}

// 1. 首先要创建或者得到一个数据对象
Order order = GetOrderById(123);


// 2. 用序列化的方法生成XML
string xml = XmlHelper.XmlSerialize(order, Encoding.UTF8);


// 3. 从XML读取数据并生成对象
Order order2 = XmlHelper.XmlDeserialize<Order>(xml, Encoding.UTF8);

更多：http://www.cnblogs.com/fish-li/archive/2013/05/05/3061816.html#_label0