用XmlDocument创建XML文档

using System;   
using System.Collections.Generic;   
using System.ComponentModel;   
using System.Data;   
using System.Drawing;   
using System.Text;   
using System.Windows.Forms;   
using System.Xml;   
namespace XMLDOMDemo  
{  
public partial class Form1 : Form  
{  
public Form1()  
{  
InitializeComponent();   
}  
private void btnLoad_Click(object sender, EventArgs e)  
{  
XmlDocument xmlDoc = new XmlDocument();   
xmlDoc.Load("Books.xml");   
MessageBox.Show(xmlDoc.InnerXml);   
}  
//创建文档   
private void btnCreate_Click(object sender, EventArgs e)  
{  
XmlDocument xmlDoc = new XmlDocument();   
//建立Xml的定义声明   
XmlDeclaration dec = xmlDoc.CreateXmlDeclaration("1.0", "GB2312", null);   
xmlDoc.AppendChild(dec);   
//创建根节点   
XmlElement root = xmlDoc.CreateElement("Books");   
xmlDoc.AppendChild(root);   
XmlNode book = xmlDoc.CreateElement("Book");   
XmlElement title = xmlDoc.CreateElement("Title");   
title.InnerText = "SQL Server";   
book.AppendChild(title);   
XmlElement isbn = xmlDoc.CreateElement("ISBN");   
isbn.InnerText = "444444";   
book.AppendChild(isbn);   
XmlElement author = xmlDoc.CreateElement("Author");   
author.InnerText = "jia";   
book.AppendChild(author);   
XmlElement price = xmlDoc.CreateElement("Price");   
price.InnerText = "120";   
price.SetAttribute("Unit", "___FCKpd___0quot; );   
book.AppendChild(price);   
root.AppendChild(book);   
xmlDoc.Save("Books.xml");   
}  
  
private void btnInsert_Click(object sender, EventArgs e)  
{  
XmlDocument xmlDoc = new XmlDocument();   
xmlDoc.Load("Books.xml");   
XmlNode root = xmlDoc.SelectSingleNode("Books");   
XmlElement book = xmlDoc.CreateElement("Book");   
XmlElement title = xmlDoc.CreateElement("Title");   
title.InnerText = "XML";   
book.AppendChild(title);   
XmlElement isbn = xmlDoc.CreateElement("ISBN");   
isbn.InnerText = "333333";   
book.AppendChild(isbn);   
XmlElement author = xmlDoc.CreateElement("Author");   
author.InnerText = "snow";   
book.AppendChild(author);   
XmlElement price = xmlDoc.CreateElement("Price");   
price.InnerText = "120";   
price.SetAttribute("Unit", "___FCKpd___0quot; );   
book.AppendChild(price);   
root.AppendChild(book);   
xmlDoc.Save("Books.xml");   
MessageBox.Show("数据已写入！");   
}  
  
private void btnUpdate_Click(object sender, EventArgs e)  
{  
XmlDocument xmlDoc = new XmlDocument();   
xmlDoc.Load("Books.xml");   
//"//Book[@Unit="{1}quot;]"   
//获取Books节点的所有子节点   
XmlNodeList nodeList = xmlDoc.SelectSingleNode("Books//Book").ChildNodes;   
//遍历所有子节点   
foreach (XmlNode xn in nodeList)  
{  
//将子节点类型转换为XmlElement类型   
XmlElement xe = (XmlElement)xn;   
if (xe.Name == "Author")  
{  
xe.InnerText = "amandag";   
}  
if (xe.GetAttribute("Unit") == "___FCKpd___0quot; )  
{  
xe.SetAttribute("Unit", "￥");   
}  
}  
xmlDoc.Save("Books.xml");   
}  
  
private void btnDelete_Click(object sender, EventArgs e)  
{  
XmlDocument xmlDoc = new XmlDocument();   
xmlDoc.Load("Books.xml");   
XmlNodeList nodeList = xmlDoc.SelectSingleNode("Books//Book").ChildNodes;   
//遍历所有子节点   
foreach (XmlNode xn in nodeList)  
{  
//将子节点类型转换为XmlElement类型   
XmlElement xe = (XmlElement)xn;   
if (xe.Name == "Author")  
{  
xe.RemoveAll();   
}  
if (xe.GetAttribute("Unit") == "￥")  
{  
xe.RemoveAttribute("Unit");   
}  
}  
xmlDoc.Save("Books.xml");   
}  
}  
}   
 using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Text; 
using System.Windows.Forms; 
using System.Xml; 
namespace XMLDOMDemo
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent(); 
}
private void btnLoad_Click(object sender, EventArgs e)
{
XmlDocument xmlDoc = new XmlDocument(); 
xmlDoc.Load("Books.xml"); 
MessageBox.Show(xmlDoc.InnerXml); 
}
//创建文档
private void btnCreate_Click(object sender, EventArgs e)
{
XmlDocument xmlDoc = new XmlDocument(); 
//建立Xml的定义声明
XmlDeclaration dec = xmlDoc.CreateXmlDeclaration("1.0", "GB2312", null); 
xmlDoc.AppendChild(dec); 
//创建根节点
XmlElement root = xmlDoc.CreateElement("Books"); 
xmlDoc.AppendChild(root); 
XmlNode book = xmlDoc.CreateElement("Book"); 
XmlElement title = xmlDoc.CreateElement("Title"); 
title.InnerText = "SQL Server"; 
book.AppendChild(title); 
XmlElement isbn = xmlDoc.CreateElement("ISBN"); 
isbn.InnerText = "444444"; 
book.AppendChild(isbn); 
XmlElement author = xmlDoc.CreateElement("Author"); 
author.InnerText = "jia"; 
book.AppendChild(author); 
XmlElement price = xmlDoc.CreateElement("Price"); 
price.InnerText = "120"; 
price.SetAttribute("Unit", "___FCKpd___0quot; ); 
book.AppendChild(price); 
root.AppendChild(book); 
xmlDoc.Save("Books.xml"); 
}

private void btnInsert_Click(object sender, EventArgs e)
{
XmlDocument xmlDoc = new XmlDocument(); 
xmlDoc.Load("Books.xml"); 
XmlNode root = xmlDoc.SelectSingleNode("Books"); 
XmlElement book = xmlDoc.CreateElement("Book"); 
XmlElement title = xmlDoc.CreateElement("Title"); 
title.InnerText = "XML"; 
book.AppendChild(title); 
XmlElement isbn = xmlDoc.CreateElement("ISBN"); 
isbn.InnerText = "333333"; 
book.AppendChild(isbn); 
XmlElement author = xmlDoc.CreateElement("Author"); 
author.InnerText = "snow"; 
book.AppendChild(author); 
XmlElement price = xmlDoc.CreateElement("Price"); 
price.InnerText = "120"; 
price.SetAttribute("Unit", "___FCKpd___0quot; ); 
book.AppendChild(price); 
root.AppendChild(book); 
xmlDoc.Save("Books.xml"); 
MessageBox.Show("数据已写入！"); 
}

private void btnUpdate_Click(object sender, EventArgs e)
{
XmlDocument xmlDoc = new XmlDocument(); 
xmlDoc.Load("Books.xml"); 
//"//Book[@Unit="{1}quot;]"
//获取Books节点的所有子节点
XmlNodeList nodeList = xmlDoc.SelectSingleNode("Books//Book").ChildNodes; 
//遍历所有子节点
foreach (XmlNode xn in nodeList)
{
//将子节点类型转换为XmlElement类型
XmlElement xe = (XmlElement)xn; 
if (xe.Name == "Author")
{
xe.InnerText = "amandag"; 
}
if (xe.GetAttribute("Unit") == "___FCKpd___0quot; )
{
xe.SetAttribute("Unit", "￥"); 
}
}
xmlDoc.Save("Books.xml"); 
}

private void btnDelete_Click(object sender, EventArgs e)
{
XmlDocument xmlDoc = new XmlDocument(); 
xmlDoc.Load("Books.xml"); 
XmlNodeList nodeList = xmlDoc.SelectSingleNode("Books//Book").ChildNodes; 
//遍历所有子节点
foreach (XmlNode xn in nodeList)
{
//将子节点类型转换为XmlElement类型
XmlElement xe = (XmlElement)xn; 
if (xe.Name == "Author")
{
xe.RemoveAll(); 
}
if (xe.GetAttribute("Unit") == "￥")
{
xe.RemoveAttribute("Unit"); 
}
}
xmlDoc.Save("Books.xml"); 
}
}
}  

<?xml version="1.0" encoding="GB2312"?>  
<Books>  
  <Book>  
    <Title>SQL Server</Title>  
    <ISBN>444444</ISBN>  
    <Author>jia</Author>  
    <Price Unit="___FCKpd___0quot;">120</Price>  
  </Book>  
</Books>