XML read/write demo program (2)

 

Using System;
Using System. Collections. Generic;
Using System. ComponentModel;
Using System. Data;
Using System. Drawing;
Using System. Linq;
Using System. Text;
Using System. Windows. Forms;
Using System. Diagnostics;
Using System. Xml;
Using System. IO;

Namespace read/write xml
{
Public partial class Form1: Form
{
String xmlPath = Application. StartupPath + "\ demo. xml ";

XmlDocument xmlDoc = new XmlDocument ();
Public Form1 ()
{
InitializeComponent ();
}

 

* ****** Void button2_Click (object sender, EventArgs e)
{

XmlDoc. Load (xmlPath );
XmlNode root = xmlDoc. SelectSingleNode ("bookstore"); // query <bookstore>
XmlElement xe1 = xmlDoc. CreateElement ("book"); // create a <book> node
Xe1.SetAttribute ("genre", "lizan red"); // you can specify the genre attribute of the node.
Xe1.SetAttribute ("ISBN", "2-3631-4"); // you can specify the ISBN attribute of the node.

XmlElement xesub1 = xmlDoc. CreateElement ("title ");
Xesub1.InnerText = "CS from entry to entry"; // set a text node
Xe1.AppendChild (xesub1); // Add it to the <book> node
XmlElement xesub2 = xmlDoc. CreateElement ("author ");
Xesub2.InnerText = "Hou Jie ";
Xe1.AppendChild (xesub2 );
XmlElement xesub3 = xmlDoc. CreateElement ("price ");
Xesub3.InnerText = "58.3 ";
Xe1.AppendChild (xesub3 );

Root. AppendChild (xe1); // Add it to the <bookstore> node
XmlDoc. Save (xmlPath );
WebBrowser1.Navigate (xmlPath );

}

* ****** Void button3_Click (object sender, EventArgs e)
{
File. Copy (Application. StartupPath + "\ demo1.xml", xmlPath, true );
WebBrowser1.Navigate (xmlPath );
}

* ****** Void button4_Click (object sender, EventArgs e)
{
// Modify node attributes
XmlDoc. Load (xmlPath );
XmlNodeList nodeList = xmlDoc. SelectSingleNode ("bookstore"). ChildNodes; // obtain all the subnodes of the bookstore Node
Foreach (XmlNode xn in nodeList) // traverses all subnodes
{
Xmlelement Xe = (xmlelement) xn; // converts the subnode type to the xmlelement type
If (Xe. getattribute ("genre") = "") // If the genre attribute value is ""
{
Xe. setattribute ("genre", "Update lizan red"); // you can change this attribute to "Update lizan red"

Xmlnodelist NLS = Xe. childnodes; // continue to obtain all the child nodes of the Xe subnode
Foreach (xmlnode xn1 in NLS) // traverse
{
XmlElement xe2 = (XmlElement) xn1; // Conversion Type
If (xe2.Name = "author") // if you find
{
Xe2.InnerText = "Yasheng"; // modify
Break; // find and exit.
}
}
Break;
}
}

XmlDoc. Save (xmlPath); // Save.
Webbrowser1.navigate (xmlpath );

}

* ****** Void button5_click (Object sender, eventargs E)
{
Xmldoc. Load (xmlpath );
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 attributes
}
Else if (Xe. getattribute ("genre") = "Update lizanhong ")
{
Xe. removeall (); // delete all content of the node
}
}
XmlDoc. Save (xmlPath );
WebBrowser1.Navigate (xmlPath );

}

* ****** Void button6_Click (object sender, EventArgs e)
{
String str1 = null;

XmlDocument myxml = new XmlDocument ();
Myxml. Load (xmlPath );

XmlNode xn = myxml. SelectSingleNode ("bookstore ");

XmlNodeList xnl = xn. ChildNodes;

Foreach (XmlNode xnf in xnl)
{
XmlElement xe = (XmlElement) xnf;
Str1 + = xe. GetAttribute ("genre ");
Str1 + = Environment. NewLine;
Str1 + = xe. GetAttribute ("ISBN ");
Str1 + = Environment. NewLine;

XmlNodeList xnf1 = xe. ChildNodes;
Foreach (XmlNode xn2 in xnf1)
{

Str1 + = xn2.InnerText;
Str1 + = Environment. NewLine;

}
}
MessageBox. Show (str1 );

}

* ****** Void Form1_Load (object sender, EventArgs e)
{
WebBrowser1.Navigate (xmlPath );

}

}
}
 

Source code download