Detailed introduction to the sample code of C# reading and writing xml file application

c# Reading and writing xml files It is known that there is an XML file (bookstore.xml) as follows:

It is known that there is an XML file (bookstore.xml) as follows:

The code is as follows:

<?xml version="1.0" encoding="gb2312"?> 
<bookstore> 
<book genre="fantasy" ISBN="2-3631-4"> 
<title>Oberon&#39;s Legacy</title> 
<author>Corets, Eva</author> 
<price>5.95</price> 
</book> 
</bookstore>

1. Insert a node into the node:

CodeXmlDocument xmlDoc=new XmlDocument(); 
xmlDoc.Load("bookstore.xml"); 
XmlNode root=xmlDoc.SelectSingleNode("bookstore");//查找<bookstore> 
XmlElement xe1=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 
XmlElement xesub1=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 
XmlElement xesub2=xmlDoc.CreateElement("author"); 
xesub2.InnerText="候捷"; 
xe1.AppendChild(xesub2); 
XmlElement xesub3=xmlDoc.CreateElement("price"); 
xesub3.InnerText="58.3";xe1.AppendChild(xesub3); 
root.AppendChild(xe1);//添加到<bookstore>节点中 
xmlDoc.Save("bookstore.xml");

The result is:

<?xml version="1.0" encoding="gb2312"?> 
<bookstore> 
<book genre="fantasy" ISBN="2-3631-4"> 
<title>Oberon&#39;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>

2. Modify the node: change genre The genre value of the node with the attribute value "Li Zanhong" is changed to "update Li Zanhong", and the text of the child node of this node is changed to "Ya Sheng".

CodeXmlNodeList nodeList=xmlDoc.SelectSingleNode("bookstore").ChildNodes;//获取bookstore节点的所有子节点 
foreach(XmlNode xn in nodeList)//遍历所有子节点 
{ XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型 
if(xe.GetAttribute("genre")=="李赞红")//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” 
XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点 
foreach(XmlNode xn1 in nls)//遍历 
{XmlElement xe2=(XmlElement)xn1;//转换类型 
if(xe2.Name=="author")//如果找到 
{ xe2.InnerText="亚胜";//则修改 
break;//找到退出来就可以了 } } break; }}xmlDoc.Save("bookstore.xml");//保存。

The final result is:

<?xml version="1.0" encoding="gb2312"?> 
<bookstore> 
<book genre="fantasy" ISBN="2-3631-4"> 
<title>Oberon&#39;s Legacy</title> 
<author>Corets, Eva</author> 
<price>5.95</price> 
</book> 
<book genre="update李赞红" ISBN="2-3631-4"> 
<title>CS从入门到精通</title> 
<author>亚胜</author> 
<price>58.3</price> 
</book> 
</bookstore>

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