C#实现XML文档的增删改查功能示例

<?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>
  /// 图书id
  /// </summary>
  public int bookid { set; get; }
  /// <summary>
  /// 图书名称
  /// </summary>
  public string title { set; get; }
  /// <summary>
  /// 图书分类
  /// </summary>
  public string category { set; get; }
  /// <summary>
  /// 图书语言
  /// </summary>
  public string language { set; get; }
  /// <summary>
  /// 图书作者
  /// </summary>
  public string author { set; get; }
  /// <summary>
  /// 出版时间
  /// </summary>
  public string year { set; get; }
  /// <summary>
  /// 销售价格
  /// </summary>
  public decimal price { set; get; }
}

using system.xml;  //引用相关文件
public class bookinfobll
{
  private string _basepath = appdomain.currentdomain.setupinformation.applicationbase + @"/xml/books.xml"; //xml文件路径
  private xmldocument _booksxmldoc = null;  //创建xml文档对象
  public bookinfobll()
  {
    try
    {
      _booksxmldoc = new xmldocument(); //初始化xml文档对象
      _booksxmldoc.load(_basepath);   //加载指定的xml文档
    }
    catch (exception ex)
    {
      throw new exception("加载xml文档出错：" + ex.message);
    }
  }
  /// <summary>
  /// 获取图书列表(查)
  /// </summary>
  /// <param name="param">参数条件</param>
  /// <returns>图书列表</returns>
  public list<bookinfo> getbookinfolist(bookinfo param)
  {
    list<bookinfo> bookinfolist = new list<bookinfo>();
    string xpath = "bookstore/book"; //默认获取所有图书
    if (param.bookid != 0) //根据图书id查询
    {
      xpath = string.format("/bookstore/book[@id='{0}']", param.bookid);
    }
    else if (!string.isnullorempty(param.category)) //根据图书类别查询
    {
      xpath = string.format("/bookstore/book[@category='{0}']", param.category);
    }
    else if (!string.isnullorempty(param.title)) //根据图书名称查询
    {
      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); //获取属性值
      bookinfo.category = booknode.attributes["category"].value;
      bookinfo.language = booknode.selectsinglenode("title").attributes["lang"].value; //获取子节点的属性值
      bookinfo.title = booknode.selectsinglenode("title").innertext;   //获取元素值
      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>
  /// 增加图书信息（增）
  /// </summary>
  /// <param name="param"></param>
  /// <returns></returns>
  public bool addbookinfo(bookinfo param)
  {
    bool result = false;
    xmlnode root = _booksxmldoc.selectsinglenode("bookstore"); //查找<bookstore>
    //创建节点
    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");
    //给节点赋值
    bookxmlelement.setattribute("id", param.bookid.tostring());
    bookxmlelement.setattribute("category", param.category);
    titlexmlelement.innertext = param.title; //给节点添加元素值
    titlexmlelement.setattribute("lang", param.language);//给节点添加属性值
    authorxmlelement.innertext = param.author;
    yearxmlelement.innertext = param.year;
    pricexmlelement.innertext = param.price.tostring();
    //appendchild 将指定的节点添加到该节点的子节点列表的末尾
    bookxmlelement.appendchild(titlexmlelement);
    bookxmlelement.appendchild(authorxmlelement);
    bookxmlelement.appendchild(yearxmlelement);
    bookxmlelement.appendchild(pricexmlelement);
    root.appendchild(bookxmlelement);
    _booksxmldoc.save(_basepath);
    result = true;
    return result;
  }
  /// <summary>
  /// 修改图书信息（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>
  /// 删除图书信息（删）
  /// </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);  //移除指定的子节点
        _booksxmldoc.save(_basepath);
        result = true;
      }
    }
    return result;
  }
}