An XML file (Bookstore.xml) is known as follows:
| The code is as follows |
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<?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:
| The code is as follows |
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| 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 getting started to proficient";/Set Text node
Xe1. AppendChild (XESUB1);//Add to <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 to <bookstore> node
Xmldoc.save ("Bookstore.xml");
The results are:
<?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> Hou Jie </author>
<price>58.3</price>
</book>
</bookstore> |
2, modify the node: The genre property value of "Li Zhanhong" node genre value changed to "Update Li Zhanhong", the node's child node <author> text modified to "Asia wins."
| The code is as follows |
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| XmlNodeList Nodelist=xmldoc.selectsinglenode ("bookstore"). childnodes;//gets all the child nodes of the bookstore node
foreach (XmlNode xn in nodelist)//traverse all child nodes
{
XmlElement xe= (XmlElement) xn;//Converts a child node type to a XmlElement type
if (XE. GetAttribute ("genre") = = "Li Zhanhong")//If genre property value is "Li Zhanhong"
{
Xe. SetAttribute ("Genre", "Update Li Zhanhong");//Modify this property to "Update Li Zhanhong" XmlNodeList Nls=xe. CHILDNODES;//continues to fetch all child nodes of the XE child node
foreach (XmlNode xn1 in NLS)//traversal
{
XmlElement xe2= (XmlElement) xn1;//conversion type
if (Xe2. name== "Author")//If found
{
Xe2. innertext= "Asia wins";//Modify
break;//find out and get out of here.
}
}
Break
}
} Xmldoc.save ("Bookstore.xml"),//save.
The final results are:
<?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= "Update Li Zhanhong" isbn= "2-3631-4" >
<title>cs from getting started to mastering </title>
<author> Asia wins </author>
<price>58.3</price>
</book>
</bookstore> |
3, delete <book genre= "Fantasy" isbn= "2-3631-4" > Node genre properties, delete <book genre= "update Li Zhanhong" isbn= "2-3631-4" > node.
| The code is as follows |
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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 all contents of the node
}
}
Xmldoc.save ("Bookstore.xml"); The final results are: <?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 the data.
| The code is as follows |
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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 value
Console.WriteLine (XE. GetAttribute ("ISBN")); XmlNodeList Xnf1=xe. ChildNodes;
foreach (XmlNode xn2 in Xnf1)
{
Console.WriteLine (xn2. innertext);//Display child node point text
}
} |
And then share an XML file Operation class
asp.net read, write, add, modify, delete operations on XML files
The following code debugging is correct
| The code is as follows |
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| Using System;
Using System.Collections;
Using System.ComponentModel;
Using System.Data;
Using System.Drawing;
Using System.Web;
Using System.Web.SessionState;
Using System.Web.UI;
Using System.Web.UI.WebControls;
Using System.Web.UI.HtmlControls;
Using System.Xml;
Private XmlDocument xmldoc; Load XML file
private void Loadxml ()
{
Xmldoc=new XmlDocument ();
Xmldoc.load (Server.MapPath ("User.xml"));
}
Add node
private void AddElement ()
{
Loadxml ();
XmlNode xmldocselect=xmldoc.selectsinglenode ("user");
XmlElement el=xmldoc.createelement ("person"); Add Person node
El. SetAttribute ("Name", "Wind and Cloud"); Add the Person node's property ' name '
El. setattribute ("Sex", "female"); Add the property "sex" of the person node
El. SetAttribute ("Age", "25"); Add the property "age" of the person node
XmlElement xesub1=xmldoc.createelement ("Pass"); Add a node in the person node
Xesub1. innertext= "123";//Set Text node
El. AppendChild (XESUB1);
XmlElement xesub2=xmldoc.createelement ("address");
Xesub2. innertext= "Kunming";/Set Text node
El. AppendChild (XESUB2); Xmldocselect.appendchild (EL);
Xmldoc.save (Server.MapPath ("User.xml"));
}
modifying nodes
private void Updateelement ()
{
Loadxml ();
XmlNodeList Nodelist=xmldoc.selectsinglenode ("user"). childnodes;//gets all the child nodes of the bookstore node
foreach (XmlNode xn in nodelist)//traverse all child nodes
{
XmlElement xe= (XmlElement) xn;//Converts a child node type to a XmlElement type
if (XE. GetAttribute ("name") = = "Cloud")//If the Name property value is "cloud"
{
Xe. SetAttribute ("name", "invention");
If there are child nodes down here
XmlNodeList Nls=xe. CHILDNODES;//continues to fetch all child nodes of the XE child node
foreach (XmlNode xn1 in NLS)//traversal
{
XmlElement xe2= (XmlElement) xn1;//conversion type
if (Xe2. name== "pass")//If found
{
Xe2. innertext= "66666";//Modify
Break
}
} Break
}
}
Xmldoc.save (Server.MapPath ("User.xml"))//Save
}
Delete a node
private void Deletenode ()
{
Loadxml ();
XmlNodeList Xnl=xmldoc.selectsinglenode ("user"). ChildNodes;
foreach (XmlNode xn in xnl)
{
XmlElement xe= (XmlElement) xn;
if (XE. GetAttribute ("name") = = "Invention")
{
Xe. RemoveAttribute ("name");//Delete Name property
Xe. RemoveAll ()//delete all contents of the node
Xe. Parentnode.removechild (XE);
Break
}
}
Xmldoc.save (Server.MapPath ("User.xml"))//Save
}
private void Showit ()
{
Loadxml ();
XmlNode xn=xmldoc.selectsinglenode ("user");
XmlNodeList Xnl=xn. ChildNodes;
foreach (XmlNode xnf in XNL)
{
XmlElement xe= (XmlElement) xnf;
Console.WriteLine (XE. GetAttribute ("name"))//Display property value
Console.WriteLine (XE. GetAttribute ("Sex"));
//
XmlNodeList Xnf1=xe. ChildNodes;
foreach (XmlNode xn2 in Xnf1)
// {
Console.WriteLine (xn2. innertext);//Display child node point text
// } } }
The style of the XML: <?xml version= "1.0" encoding= "gb2312"?>
<user>
<person>
</person>
<person name= "Wind Pull" sex= "male" age= ">"
<pass>123</pass>
<Address> daming </Address>
</person>
<person name= "The Wind and Cloud" sex= "female" age= ">"
<pass>123</pass>
<Address> Kunming </Address>
</person>
</user> |
