https://blog.csdn.net/weixin_33762130/article/details/86047429
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
</bookstore>
Imports System.Xml
Public Class Form1
Dim xmlDoc As New XmlDocument()
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'往<bookstore>节点中插入一个<book>节点:
xmlDoc.Load("bookstore.xml")
Dim root As XmlNode = xmlDoc.SelectSingleNode("bookstore") '查找<bookstore>
Dim xe1 As XmlElement = xmlDoc.CreateElement("book") '创建一个<book>节点
xe1.SetAttribute("genre", "李赞红") '设置该节点genre属性
xe1.SetAttribute("ISBN", "2-3631-4") '设置该节点ISBN属性
Dim xesub1 As XmlElement = xmlDoc.CreateElement("title")
xesub1.InnerText = "CS从入门到精通" '设置文本节点
xe1.AppendChild(xesub1) '添加到<book>节点中
Dim xesub2 As XmlElement = xmlDoc.CreateElement("author")
xesub2.InnerText = "候捷"
xe1.AppendChild(xesub2)
Dim xesub3 As XmlElement = xmlDoc.CreateElement("price")
xesub3.InnerText = "58.3"
xe1.AppendChild(xesub3)
root.AppendChild(xe1) '添加到<bookstore>节点中
xmlDoc.Save("bookstore.xml")
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim nodeList As XmlNodeList = xmlDoc.SelectSingleNode("bookstore").ChildNodes '获取bookstore节点的所有子节点
Dim xn As XmlNode
For Each xn In nodeList '遍历所有子节点
Dim xe As XmlElement = CType(xn, XmlElement) '将子节点类型转换为XmlElement类型
If xe.GetAttribute("genre") = "李赞红" Then '如果genre属性值为“李赞红”
xe.SetAttribute("genre", "update李赞红") '则修改该属性为“update李赞红”
Dim nls As XmlNodeList = xe.ChildNodes '继续获取xe子节点的所有子节点
Dim xn1 As XmlNode
For Each xn1 In nls '遍历
Dim xe2 As XmlElement = CType(xn1, XmlElement) '转换类型
If xe2.Name = "author" Then '如果找到
xe2.InnerText = "亚胜" '则修改
Exit For '找到退出来就可以了
End If
Next xn1
Exit For
End If
Next xn
xmlDoc.Save("bookstore.xml") '保存。
End Sub
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim xnl As XmlNodeList = xmlDoc.SelectSingleNode("bookstore").ChildNodes
Dim xn As XmlNode
For Each xn In xnl
Dim xe As XmlElement = CType(xn, XmlElement)
If xe.GetAttribute("genre") = "fantasy" Then
xe.RemoveAttribute("genre") '删除genre属性
Else
If xe.GetAttribute("genre") = "update李赞红" Then
xe.RemoveAll() '删除该节点的全部内容
End If
End If
Next xn
xmlDoc.Save("bookstore.xml")
End Sub
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
Dim xn As XmlNode = xmlDoc.SelectSingleNode("bookstore")
Dim xnl As XmlNodeList = xn.ChildNodes
Dim xnf As XmlNode
For Each xnf In xnl
Dim xe As XmlElement = CType(xnf, XmlElement)
Console.WriteLine(xe.GetAttribute("genre")) '显示属性值
Console.WriteLine(xe.GetAttribute("ISBN"))
Dim xnf1 As XmlNodeList = xe.ChildNodes
Dim xn2 As XmlNode
For Each xn2 In xnf1
Console.WriteLine(xn2.InnerText) '显示子节点点文本
Next xn2
Next xnf
End Sub
End Class
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