C # XML file read and modify

C # Read and write XML files
It is known that an XML file (Bookstore.xml) is as follows:

Code
<?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:

Code
XmlDocument xmldoc=new XmlDocument ();
Xmldoc.load ("Bookstore.xml");
XmlNode Root=xmldoc.selectsinglenode ("bookstore");//Find <bookstore>
XmlElement xe1=xmldoc.createelement ("book");//Create a <book> node
Xe1. SetAttribute ("Genre", "Li Zhanhong");//Set the node genre property
Xe1. SetAttribute ("ISBN", "2-3631-4");//Set the node ISBN property

XmlElement xesub1=xmldoc.createelement ("title");
Xesub1. Innertext= "CS from beginner to proficient";//Set Text node
Xe1. AppendChild (XESUB1);//Add to <book> node
XmlElement xesub2=xmldoc.createelement ("author");
Xesub2. Innertext= "Waiting for the Czech Republic";
Xe1. AppendChild (XESUB2);
XmlElement xesub3=xmldoc.createelement ("price");
Xesub3. innertext= "58.3";
Xe1. AppendChild (XESUB3);

Root. AppendChild (XE1);//Add to <bookstore> node
Xmldoc.save ("Bookstore.xml");

The result is:

Code
<?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 Zhanhong" isbn= "2-3631-4" >
    <title>cs from getting started to mastering </title>
    <author> </author>
    <price>58.3</price>
  </book>
</bookstore>

2. Modify the node: Change the genre value of the node with the genre property value to "Li Zhanhong" to "Update Li Zhanhong", and modify the text of the node's child nodes <author> to "Ya Sheng".

Code

The final result is:

 code 
 <?xml version= "1.0" encoding= "gb2312", 
 <bookstore> 
 <book genre= "Fantasy" isbn= "2-3631-4" > 
 <title>oberon ' s legacy</title> 
 <author>corets, eva</author> 
 <price>5.9 5</price> 
 </book> 
 <book genre= "update Li Zhanhong" isbn= "2-3631-4"; 
 <title>cs from Getting started to mastering </ Title>, 
 <author> </author>, 
 <price>58.3</price> 
 </book> 
 </ Bookstore>   
 
 3, delete isbn= properties of <book genre= "fantasy" 2-3631-4 "Genre" > node, delete <book genre= " Update Li Zhanhong "isbn=" 2-3631-4 "> node. 

Code
XmlNodeList Xnl=xmldoc.selectsinglenode ("bookstore"). ChildNodes;

foreach (XmlNode xn in xnl)
{
    XmlElement xe= (XmlElement) xn;
    if (XE. GetAttribute ("genre") = = "Fantasy")
    {
        Xe. RemoveAttribute ("genre");//Delete genre property
    }
    else if (XE. GetAttribute ("genre") = = "Update Li Zhanhong")
    {
        Xe. RemoveAll ();//delete the entire contents of the node
    }
}
Xmldoc.save ("Bookstore.xml");

The final result is:

Code
<?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. Display all data.

XmlNode Xn=xmldoc.selectsinglenode ("bookstore");
XmlNodeList Xnl=xn. ChildNodes;

foreach (XmlNode xnf in XNL)
{
    XmlElement xe= (XmlElement) xnf;
    Console.WriteLine (XE. GetAttribute ("genre"));//Display property values
    Console.WriteLine (XE. GetAttribute ("ISBN"));

    XmlNodeList Xnf1=xe. ChildNodes;
    foreach (XmlNode xn2 in Xnf1)
    {
        Console.WriteLine (xn2. InnerText);//Display child node point text
    }
}

C # XML file read and modify