<?
xml version="1.0" encoding="gb2312"
?>
<
bookstore
>
<
book
genre
="fantasy"
ISBN
="2-3631-4"
>
<
title
>
Oberon's Legacy
</
title
>
<
author
>
Corets,Eva
</
author
>
<
price
>
5.95
</
price
>
</
book
>
</
bookstore
>
往<bookstore>节点中插入一个<book>节点：
Dim
xmlDoc
As
New
XmlDocument()
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
"
)
结果为：
<?
xml version="1.0" encoding="gb2312"
?>
<
bookstore
>
<
book
genre
="fantasy"
ISBN
="2-3631-4"
>
<
title
>
Oberon's Legacy
</
title
>
<
author
>
Corets,Eva
</
author
>
<
price
>
5.95
</
price
>
</
book
>
<
book
genre
="李赞红"
ISBN
="2-3631-4"
>
<
title
>
CS从入门到精通
</
title
>
<
author
>
候捷
</
author
>
<
price
>
58.3
</
price
>
</
book
>
</
bookstore
>
修改节点：将genre属性值为“李赞红“的节点的genre值改为“update李赞红”，将该节点的子节点<author>的文本修改为 “亚胜”。
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
ForEach
'
找到退出来就可以了
End
If
Next
xn1
Exit
ForEach
End
If
Next
xn
显示所有数据。
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
