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VB.NET中操作xml文件

    博客分类:
  • .NET
 
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http://blog.csdn.net/xiaolinyouni/article/details/7209444
已知有一个XML文件(bookstore.xml)如下:
<?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
 
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