C# Example of adding, deleting, modifying and searching operations for xml

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

Copy the codeThe code is as follows:

<?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>

1、Insert a <book> node into the <bookstore> node：

Copy the codeThe code is as follows:

XmlDocument xmlDoc=new XmlDocument();
("");
XmlNode root=("bookstore");//Find <bookstore>
XmlElement xe1=("book");//Create a <book> node
("genre","Li Zanhong");//Set the genre attribute of this node
("ISBN","2-3631-4");//Set the ISBN attribute of this node

XmlElement xesub1=("title");
="CS from Beginner to Mastery";//Set Text Node
(xesub1);//Add to the <book> node
XmlElement xesub2=("author");
="not yet";
(xesub2);
XmlElement xesub3=("price");
="58.3";
(xesub3);

(xe1);//Add to the <bookstore> node
("");

The result is:

Copy the codeThe code is as follows:

<?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="Li Zanhong" ISBN="2-3631-4">
<title>CS From Beginner to Mastery</title>
<author>Hou Jie</author>
<price>58.3</price>
</book>
</bookstore>

2、Modify nodes: Change the genre value of the node with the genre attribute value "Li Zanhong" to "update Li Zanhong", and change the text of the child node <author> of the node to "Yasheng".

Copy the codeThe code is as follows:

XmlNodeList nodeList=("bookstore").ChildNodes;//Get all children of the bookstore node
foreach(XmlNode xn in nodeList)//Transfer all child nodes
{
XmlElement xe=(XmlElement)xn;//Convert child node type to XmlElement type
if(("genre")=="Li Zanhong")//If the genre attribute value is "Li Zanhong"
{
("genre","update Li Zanhong");//Then modify this property to "update Li Zanhong"

XmlNodeList nls=;//Continue to get all children of xe child nodes
foreach(XmlNode xn1 in nls)//Transaction
{
XmlElement xe2=(XmlElement)xn1;//Convert type
if(=="author")//If found
{
="Chinese";//Then modify
break;// Just find and exit
}
}
break;
}
}

("");//save.

The final result is:

Copy the codeThe code is as follows:

<?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="updateLi Zanhong" ISBN="2-3631-4">
<title>CS From Beginner to Mastery</title>
<author>Asias</author>
<price>58.3</price>
</book>
</bookstore>

3. Delete the genre attribute of the <book genre="fantasy" ISBN="2-3631-4"> node, and delete the <book genre="updateLi Zanhong" ISBN="2-3631-4"> node.

Copy the codeThe code is as follows:

XmlNodeList xnl=("bookstore").ChildNodes;

foreach(XmlNode xn in xnl)
{
XmlElement xe=(XmlElement)xn;
if(("genre")=="fantasy")
{
("genre");//Delete the genre attribute
}
else if(("genre")=="updateLi Zanhong")
{
();//Delete all contents of this node
}
}
("");

The final result is:

Copy the codeThe code is as follows:

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

4、Show all data

Copy the codeThe code is as follows:

XmlNode xn=("bookstore");
XmlNodeList xnl=;

foreach(XmlNode xnf in xnl)
{
XmlElement xe=(XmlElement)xnf;
(("genre"));//Display attribute values
(("ISBN"));

XmlNodeList xnf1=;
foreach(XmlNode xn2 in xnf1)
{
();//Show child node point text
}
}