xml add-update-delete-show
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
1
Private Sub btnAddXml_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddXml.Click
2![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
3
xmlDoc.Load("bookstore.xml") '加载xml
4
Dim root As Xml.XmlNode = xmlDoc.SelectSingleNode("bookstore") '查找<bookstore>节点
5
Dim xe As Xml.XmlElement = xmlDoc.CreateElement("book") '创建一个<book>子节点
6
xe.SetAttribute("genre", "教程") '设置该节点的 genre属性
7
xe.SetAttribute("ISBN", "7-121-01812-6") '设置该节点的 ISBN 属性
8![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
9
Dim xeSub1 As Xml.XmlElement = xmlDoc.CreateElement("title")
10
xeSub1.InnerText = "vb.net2005教程"
11
xe.AppendChild(xeSub1) '添加到 <book>子节点中
12
Dim xeSub2 As Xml.XmlElement = xmlDoc.CreateElement("auther")
13
xeSub2.InnerText = "作者:王勇"
14
xe.AppendChild(xeSub2) '添加到 <book>子节点中
15
Dim xeSub3 As Xml.XmlElement = xmlDoc.CreateElement("price")
16
xeSub3.InnerText = "15.3"
17
xe.AppendChild(xeSub3) '添加到 <book>子节点中
18![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
19
root.AppendChild(xe) '添加到<bookstore>子节点中
20
xmlDoc.Save("bookstore.xml") '保存
21
End Sub
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
2
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
3
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
4
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
5
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
6
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
7
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
8
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
9
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
10
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
11
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
12
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
13
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
14
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
15
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
16
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
17
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
18
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
19
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
20
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
21
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
result:
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
1
Private Sub btnXml_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpdateXml.Click
2
xmlDoc.Load("bookstore.xml") '加载xml
3
Dim nodeList As Xml.XmlNodeList
4
nodeList = xmlDoc.SelectSingleNode("bookstore").ChildNodes '获取<bookstore>节点的所有子节点
5
For Each xn As Xml.XmlNode In nodeList '遍历所有子节点
6
Dim xe As Xml.XmlElement = CType(xn, Xml.XmlElement) '将子节点类型转换成 xmlElement类型
7
If xe.GetAttribute("genre") = "教程" Then '如果genre的属性值的为"教程",则更新
8
xe.SetAttribute("genre", "update教程")
9![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
10
Dim nlt As Xml.XmlNodeList = xe.ChildNodes '获取xe节点的子节点
11
For Each xe1 As Xml.XmlNode In nlt '遍历子节点
12
Dim xe2 As Xml.XmlElement = CType(xe1, Xml.XmlElement) '类型转换
13
If xe2.Name = "auther" Then '找子节点 auther
14
xe2.InnerText = "王勇 晨之阳"
15
Exit For
16
End If
17
Next
18
End If
19
Next
20
xmlDoc.Save("bookstore.xml") '保存
21
End Sub
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
2
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
3
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
4
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
5
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
6
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
7
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
8
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
9
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
10
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
11
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
12
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
13
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
14
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
15
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
16
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
17
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
18
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
19
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
20
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
21
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
result:
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
1
Private Sub btnDeleteXml_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDeleteXml.Click
2
xmlDoc.Load("bookstore.xml") '加载
3
Dim nodeList As Xml.XmlNodeList = xmlDoc.SelectSingleNode("bookstore").ChildNodes '获取子节点
4
For Each xn As Xml.XmlNode In nodeList '遍历所有子节点
5
Dim xe As Xml.XmlElement = CType(xn, Xml.XmlElement) '类型转换
6
If xe.GetAttribute("genre") = "update教程" Then '如果存在这个节点,则更新
7
xe.RemoveAttribute("genre")
8
End If
9![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
10
Dim nlt As Xml.XmlNodeList = xe.ChildNodes '获取xe的子节点
11
For Each xe1 As Xml.XmlNode In xe.ChildNodes
12
Dim xe2 As Xml.XmlElement = CType(xe1, Xml.XmlElement)
13
If xe2.Name = "price" Then '如果存在 price 节点,则删除该属性值
14
xe2.RemoveAll()
15
Exit For '退出循环
16
End If
17
Next
18
Next
19
xmlDoc.Save("bookstore.xml")
20
End Sub
result:![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
2
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
3
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
4
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
5
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
6
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
7
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
8
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
9
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
10
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
11
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
12
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
13
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
14
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
15
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
16
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
17
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
18
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
19
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
20
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
1
Private Sub btnShowXml_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnShowXml.Click
2
xmlDoc.Load("bookstore.xml")
3
Dim nodeList As Xml.XmlNodeList = xmlDoc.SelectSingleNode("bookstore").ChildNodes '获取bookstore节点的子节点
4
For Each xn As Xml.XmlNode In nodeList '遍历bookstore节点的所有子节点
5
Dim xe As Xml.XmlElement = CType(xn, Xml.XmlElement)
6
Me.lblShowXml.Text = "ISBN:" + xe.GetAttribute("ISBN")
7![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
8
Dim nlt As Xml.XmlNodeList = xe.ChildNodes
9
For Each xn2 As Xml.XmlNode In nlt '遍历xe的子节点
10
If xn2.Name = "title" Then '如果节点 title 存在,则显示甚属性值
11
Me.lblShowXml.Text += " -- title:" + xn2.InnerText
12
End If
13![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
14
Next
15
Next
16
End Sub
result:![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
2
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
3
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
4
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
5
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
6
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
7
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
8
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
9
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
10
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
11
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
12
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
13
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
14
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
15
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
16
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
ISBN:7-121-01812-6 -- title:vb.net2005教程