本文实例讲述了c#实现xml文档的增删改查功能。分享给大家供大家参考，具体如下：
1、 创建实例xml文件（books.xml）
<?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>
2、 创建图书信息实体类（bookinfo.cs）
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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; }
}
3、 创建图书信息业务逻辑类（bookinfobll.cs）
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;
}
}
ps:这里再为大家提供几款比较实用的xml相关在线工具供大家使用：
在线xml格式化/压缩工具：
在线xml/json互相转换工具：
xml在线压缩/格式化工具：
xml代码在线格式化美化工具：
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