使用XmlDocument创建XML文档及增加删除更新节点

1. using System;
2. using System.Collections.Generic;
3. using System.ComponentModel;
4. using System.Data;
5. using System.Drawing;
6. using System.Text;
7. using System.Windows.Forms;
8. using System.Xml;
9. namespace XMLDOMDemo
10. {
11.     public partial class Form1 : Form
12.     {
13.         public Form1()
14.         {
15.             InitializeComponent();
16.         }
19.         private void btnLoad_Click(object sender, EventArgs e)
20.         {
21.             XmlDocument xmlDoc = new XmlDocument();
22.             xmlDoc.Load("Books.xml");
23.             MessageBox.Show(xmlDoc.InnerXml);
24.         }
25.         //创建文档
26.         private void btnCreate_Click(object sender, EventArgs e)
27.         {
28.             XmlDocument xmlDoc = new XmlDocument();
30.             //建立Xml的定义声明
31.             XmlDeclaration dec = xmlDoc.CreateXmlDeclaration("1.0", "GB2312", null);
32.             xmlDoc.AppendChild(dec);
34.             //创建根节点
35.             XmlElement root = xmlDoc.CreateElement("Books");
36.             xmlDoc.AppendChild(root);
39.             XmlNode book = xmlDoc.CreateElement("Book");
41.             XmlElement title = xmlDoc.CreateElement("Title");
42.             title.InnerText = "SQL Server";
43.             book.AppendChild(title);
45.             XmlElement isbn = xmlDoc.CreateElement("ISBN");
46.             isbn.InnerText = "444444";
47.             book.AppendChild(isbn);
49.             XmlElement author = xmlDoc.CreateElement("Author");
50.             author.InnerText = "jia";
51.             book.AppendChild(author);
53.             XmlElement price = xmlDoc.CreateElement("Price");
54.             price.InnerText = "120";
55.             price.SetAttribute("Unit", "___FCKpd___0quot;);
57.             book.AppendChild(price);
58.             root.AppendChild(book);
60.             xmlDoc.Save("Books.xml");
61.         }
63.         private void btnInsert_Click(object sender, EventArgs e)
64.         {
65.             XmlDocument xmlDoc = new XmlDocument();
66.             xmlDoc.Load("Books.xml");
68.             XmlNode root = xmlDoc.SelectSingleNode("Books");
70.             XmlElement book = xmlDoc.CreateElement("Book");
72.             XmlElement title = xmlDoc.CreateElement("Title");
73.             title.InnerText = "XML";
74.             book.AppendChild(title);
76.             XmlElement isbn = xmlDoc.CreateElement("ISBN");
77.             isbn.InnerText = "333333";
78.             book.AppendChild(isbn);
80.             XmlElement author = xmlDoc.CreateElement("Author");
81.             author.InnerText = "snow";
82.             book.AppendChild(author);
84.             XmlElement price = xmlDoc.CreateElement("Price");
85.             price.InnerText = "120";
86.             price.SetAttribute("Unit", "___FCKpd___0quot;);
88.             book.AppendChild(price);
90.             root.AppendChild(book);
92.             xmlDoc.Save("Books.xml");
93.             MessageBox.Show("数据已写入！");
94.         }
96.         private void btnUpdate_Click(object sender, EventArgs e)
97.         {
98.             XmlDocument xmlDoc = new XmlDocument();
99.             xmlDoc.Load("Books.xml");
101.             //"//Book[@Unit=/"$/"]"
102.             //获取Books节点的所有子节点
103.             XmlNodeList nodeList = xmlDoc.SelectSingleNode("Books//Book").ChildNodes;
105.             //遍历所有子节点
106.             foreach (XmlNode xn in nodeList)
107.             {
108.                 //将子节点类型转换为XmlElement类型
109.                 XmlElement xe = (XmlElement)xn;
110.                 if (xe.Name == "Author")
111.                 {
112.                     xe.InnerText = "amandag";
113.                 }
115.                 if (xe.GetAttribute("Unit") == "___FCKpd___0quot;)
116.                 {
117.                     xe.SetAttribute("Unit", "￥");
118.                 }
119.                 //break;
120.             }
122.             //XmlNodeList nodeList = xmlDoc.SelectNodes("Books//Book"); 
123.             //foreach (XmlNode xn in nodeList)
124.             //{
125.             //    foreach (XmlNode x in xn.ChildNodes)
126.             //    {
127.             //         //将子节点类型转换为XmlElement类型
128.             //        XmlElement xe = (XmlElement)x;
129.             //        if (xe.Name == "Author")
130.             //        {
131.             //            xe.InnerText = "amandag";
132.             //        }
134.             //        if (xe.GetAttribute("Unit") == "___FCKpd___0quot;)
135.             //        {
136.             //            xe.SetAttribute("Unit", "￥");
137.             //        }
138.             //        //break;                   
139.             //    }
140.             //}
141.             xmlDoc.Save("Books.xml");
142.         }
144.         private void btnDelete_Click(object sender, EventArgs e)
145.         {
146.             XmlDocument xmlDoc = new XmlDocument();
147.             xmlDoc.Load("Books.xml");
149.             XmlNodeList nodeList = xmlDoc.SelectSingleNode("Books//Book").ChildNodes;
151.             //遍历所有子节点
152.             foreach (XmlNode xn in nodeList)
153.             {
154.                 //将子节点类型转换为XmlElement类型
155.                 XmlElement xe = (XmlElement)xn;
156.                 if (xe.Name == "Author")
157.                 {
158.                     xe.RemoveAll();
159.                 }
161.                 if (xe.GetAttribute("Unit") == "￥")
162.                 {
163.                     xe.RemoveAttribute("Unit");
164.                 }
165.             }
166.             xmlDoc.Save("Books.xml");
167.         }
168.     }
169. }