<?xml version="1.0" encoding="iso-8859-1"?><bookstore> <book id="1" category="COOKING">  <title lang="en">Everyday Italian</title>  <author>Giada De Laurentiis</author>  <year>2005</year>  <price>30.00</price> </book> <book id="2" category="CHILDREN">  <title lang="en">Harry Potter</title>  <author>J K. Rowling</author>  <year>2005</year>  <price>29.99</price> </book> <book id="3" category="WEB">  <title lang="en">XQuery Kick Start</title>  <author>James McGovern</author>  <author>Per Bothner</author>  <author>Kurt Cagle</author>  <author>James Linn</author>  <author>Vaidyanathan Nagarajan</author>  <year>2003</year>  <price>49.99</price> </book> <book id="4" category="WEB">  <title lang="en">Learning XML</title>  <author>Erik T. Ray</author>  <year>2003</year>  <price>39.95</price> </book></bookstore>

public class BookInfo{  /// <summary>  /// 圖書ID  /// </summary>  public int BookId { set; get; }  /// <summary>  /// 圖書名稱  /// </summary>  public string Title { set; get; }  /// <summary>  /// 圖書分類  /// </summary>  public string Category { set; get; }  /// <summary>  /// 圖書語言  /// </summary>  public string Language { set; get; }  /// <summary>  /// 圖書作者  /// </summary>  public string Author { set; get; }  /// <summary>  /// 出版時間  /// </summary>  public string Year { set; get; }  /// <summary>  /// 銷售價格  /// </summary>  public decimal Price { set; get; }}

using System.Xml;  //引用相關(guān)文件public class BookInfoBLL{  private string _basePath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @"/xml/Books.xml"; //XML文件路徑  private XmlDocument _booksXmlDoc = null;  //創(chuàng)建XML文檔對象  public BookInfoBLL()  {    try    {      _booksXmlDoc = new XmlDocument(); //初始化XML文檔對象      _booksXmlDoc.Load(_basePath);   //加載指定的XML文檔    }    catch (Exception ex)    {      throw new Exception("加載XML文檔出錯：" + ex.Message);    }  }  /// <summary>  /// 獲取圖書列表(查)  /// </summary>  /// <param name="param">參數(shù)條件</param>  /// <returns>圖書列表</returns>  public List<BookInfo> GetBookInfoList(BookInfo param)  {    List<BookInfo> bookInfoList = new List<BookInfo>();    string xPath = "bookstore/book"; //默認(rèn)獲取所有圖書    if (param.BookId != 0) //根據(jù)圖書ID查詢    {      xPath = String.Format("/bookstore/book[@id='{0}']", param.BookId);    }    else if (!String.IsNullOrEmpty(param.Category)) //根據(jù)圖書類別查詢    {      xPath = String.Format("/bookstore/book[@category='{0}']", param.Category);    }    else if (!String.IsNullOrEmpty(param.Title)) //根據(jù)圖書名稱查詢    {      xPath = String.Format("/bookstore/book[title='{0}']", param.Title);    }    XmlNodeList booksXmlNodeList = _booksXmlDoc.SelectNodes(xPath);    foreach (XmlNode bookNode in booksXmlNodeList)    {      BookInfo bookInfo = new BookInfo();      bookInfo.BookId = Convert.ToInt32(bookNode.Attributes["id"].Value); //獲取屬性值      bookInfo.Category = bookNode.Attributes["category"].Value;      bookInfo.Language = bookNode.SelectSingleNode("title").Attributes["lang"].Value; //獲取子節(jié)點的屬性值      bookInfo.Title = bookNode.SelectSingleNode("title").InnerText;   //獲取元素值      bookInfo.Author = bookNode.SelectSingleNode("author").InnerText;      bookInfo.Year = bookNode.SelectSingleNode("year").InnerText;      bookInfo.Price = Convert.ToDecimal(bookNode.SelectSingleNode("price").InnerText);      bookInfoList.Add(bookInfo);    }    return bookInfoList;  }  /// <summary>  /// 增加圖書信息（增）  /// </summary>  /// <param name="param"></param>  /// <returns></returns>  public bool AddBookInfo(BookInfo param)  {    bool result = false;    XmlNode root = _booksXmlDoc.SelectSingleNode("bookstore"); //查找<bookstore>    //創(chuàng)建節(jié)點    XmlElement bookXmlElement = _booksXmlDoc.CreateElement("book");    XmlElement titleXmlElement = _booksXmlDoc.CreateElement("title");    XmlElement authorXmlElement = _booksXmlDoc.CreateElement("author");    XmlElement yearXmlElement = _booksXmlDoc.CreateElement("year");    XmlElement priceXmlElement = _booksXmlDoc.CreateElement("price");    //給節(jié)點賦值    bookXmlElement.SetAttribute("id", param.BookId.ToString());    bookXmlElement.SetAttribute("category", param.Category);    titleXmlElement.InnerText = param.Title; //給節(jié)點添加元素值    titleXmlElement.SetAttribute("lang", param.Language);//給節(jié)點添加屬性值    authorXmlElement.InnerText = param.Author;    yearXmlElement.InnerText = param.Year;    priceXmlElement.InnerText = param.Price.ToString();    //AppendChild 將指定的節(jié)點添加到該節(jié)點的子節(jié)點列表的末尾    bookXmlElement.AppendChild(titleXmlElement);    bookXmlElement.AppendChild(authorXmlElement);    bookXmlElement.AppendChild(yearXmlElement);    bookXmlElement.AppendChild(priceXmlElement);    root.AppendChild(bookXmlElement);    _booksXmlDoc.Save(_basePath);    result = true;    return result;  }  /// <summary>  /// 修改圖書信息（改）  /// </summary>  /// <param name="param"></param>  /// <returns></returns>  public bool EditBookInfo(BookInfo param)  {    bool result = false;    if(param.BookId>0)    {      string xPath = String.Format("/bookstore/book[@id='{0}']", param.BookId);      XmlNode editXmlNode = _booksXmlDoc.SelectSingleNode(xPath);      XmlElement editXmlElement = (XmlElement)editXmlNode;      if (editXmlElement != null)      {        editXmlElement.Attributes["category"].Value = param.Category;        editXmlElement.SelectSingleNode("title").Attributes["lang"].Value = param.Language;        editXmlElement.SelectSingleNode("title").InnerText = param.Title;        editXmlElement.SelectSingleNode("author").InnerText = param.Author;        editXmlElement.SelectSingleNode("year").InnerText = param.Year;        editXmlElement.SelectSingleNode("price").InnerText = param.Price.ToString();        _booksXmlDoc.Save(_basePath);        result = true;      }    }    return result;  }  /// <summary>  /// 刪除圖書信息（刪）  /// </summary>  /// <param name="param"></param>  /// <returns></returns>  public bool DeleteBookInfo(BookInfo param)  {    bool result = false;    if (param.BookId > 0)    {      string xPath = String.Format("/bookstore/book[@id='{0}']", param.BookId);      XmlNode delXmlNode = _booksXmlDoc.SelectSingleNode(xPath);      if (delXmlNode != null)      {        _booksXmlDoc.SelectSingleNode("bookstore").RemoveChild(delXmlNode);  //移除指定的子節(jié)點        _booksXmlDoc.Save(_basePath);        result = true;      }    }    return result;  }}