vb.net与XML之间的操作

Imports System.Xml '声明XML
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim dataset As New DataSet '声明一个dataset
dataset.ReadXml("f:\aaa.xml") '读xml文件，并把xml文件放入到datset的第一个表中
Dim table As DataTable = dataset.Tables(0) '读出该表
Dim view As DataView = New DataView(table) '自定义视图
DataGridView1.DataSource = view '绑定数据源
End Sub
Public Sub appear() '同上
Dim dataset As New DataSet
dataset.ReadXml("f:\aaa.xml")
Dim table As DataTable = dataset.Tables(0)
Dim view As DataView = New DataView(table)
DataGridView2.DataSource = view
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim xmlDou As XmlDocument = New XmlDocument() '声明一个xml文档对象
xmlDou.Load("f:\aaa.xml") '将特定的xml文档写入xmldoucument
Dim xmlnode As XmlNode = xmlDou.SelectSingleNode("bookstore") '声明一个根标记，bookstore为根标记
Dim xml1 As XmlElement = xmlDou.CreateElement("book") '声明一个xml的节点
xml1.SetAttribute("genre", "李簪红") '节点的属性
xml1.SetAttribute("ISBN", "2-3621-4") '同上
Dim xml1_title As XmlElement = xmlDou.CreateElement("title") '声明一个xml的节点
xml1_title.InnerText = "C#程序设计入门与技巧" '定义节点的文档
xml1.AppendChild(xml1_title) '向总节点尾部添加节点
Dim xml1_author As XmlElement = xmlDou.CreateElement("author") '同上
xml1_author.InnerText = "张永斌"
xml1.AppendChild(xml1_author)
Dim xml1_price As XmlElement = xmlDou.CreateElement("price")
xml1_price.InnerText = "56.7"
xml1.AppendChild(xml1_price)
xmlnode.AppendChild(xml1)
Dim xml2 As XmlElement = xmlDou.CreateElement("book")
xml2.SetAttribute("genre", "乐于")
xml2.SetAttribute("ISBN", "3-3423-5")
Dim xml2_title As XmlElement = xmlDou.CreateElement("title")
xml2_title.InnerText = "JAVA"
xml2.AppendChild(xml2_title)
Dim xml2_author As XmlElement = xmlDou.CreateElement("author")
xml2_author.InnerText = "防御忧郁"
xml2.AppendChild(xml2_author)
Dim xml2_price As XmlElement = xmlDou.CreateElement("price")
xml2_price.InnerText = "44.4"
xml2.AppendChild(xml2_price)
xmlnode.AppendChild(xml2)
xmlDou.Save("f:\aaa.xml")
appear()
End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim xmlDoc As XmlDocument = New XmlDocument '同上
xmlDoc.Load("f:\aaa.xml") '同上
Dim nodelist As XmlNodeList = xmlDoc.SelectSingleNode("bookstore").ChildNodes() '定义了一个xmlnodelist 用于放根节点为bookstore的所有字标记
For Each node As XmlNode In nodelist '遍历整个xmlnodelist
Dim elem As XmlElement = node '将节点转换为element元素
Dim elem_children As XmlNodeList = elem.ChildNodes() '定义了一个elem_children 用于放根节点为bookstore的所有字标记
If elem.GetAttribute("genre") = "李簪红" Then '获得第一子节点的属性
elem.SetAttribute("genre", "updata李簪红") '更新第一节点的属性
End If
For Each elem_node As XmlNode In elem_children '遍历第二子节点
Dim elem_node_toelem As XmlElement = elem_node '将节点转换为element元素
If elem_node_toelem.Name = "author" Then '如果第二子节点的名称为author
If elem_node_toelem.InnerText = "防御忧郁" Then '如果这个节点的值为防御忧郁则
elem_node_toelem.InnerText = "O(∩_∩)O哈哈~" '更改他的值
End If
End If
Next
Next
xmlDoc.Save("f:\aaa.xml") '保存xml文件
appear()
End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
Dim xmlDuc As XmlDocument = New XmlDocument()
xmlDuc.Load("f:\aaa.xml")
Dim xml_geng As XmlElement = xmlDuc.SelectSingleNode("bookstore")
Dim xmlnodelist As XmlNodeList = xml_geng.ChildNodes()
For Each xmlnode As XmlNode In xmlnodelist
Dim xmlnodetoelem As XmlElement = xmlnode
If xmlnodetoelem.GetAttribute("genre") = "乐于" Then
xmlnodetoelem.RemoveAttribute("genre")
End If
Next
For Each xmlnode As XmlNode In xmlnodelist
Dim xmlnodetoelem As XmlElement = xmlnode
If xmlnodetoelem.GetAttribute("genre") = "fantasy" Then
xmlnodetoelem.RemoveAll()
End If
Next
xmlDuc.Save("f:\aaa.xml") '保存xml文件
appear()
End Sub
End Class