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Asp.net (C #) Xml operation (add, delete, modify, and query) Exercise

Source: Internet
Author: User
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Web. config Configuration:
Copy codeThe Code is as follows:
<Deleetask>
<Add key = "xmlFile" value = "xml/class. xml"/>
</AppSettings>
<Deleetask>
<Add key = "xmlFile" value = "xml/class. xml"/>
</AppSettings>

Front-end:
Copy codeThe Code is as follows:
<% @ Page Language = "C #" AutoEventWireup = "true" CodeFile = "Default. aspx. cs" Inherits = "test_Default" %>
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> C # Xml (add, delete, modify, and query) exercises </title>
</Head>
<Body>
<Form id = "form1" runat = "server">
<Div id = "showXml" runat = "server">
Show Xml document
</Div>
<Div style = "background-color: Green; color: Yellow;" style = "background-color: Green; color: Yellow; "> two key points for binding server controls to html controls: <br/>
1. onserverclick = "serverMethod" only write the method name here. <br/>
2. Background code, which must be <br/>
Protected void XmlAdd (object sender, EventArgs e) {}< br/>
Pay attention to the two parameters and the protection level.
</Div>
<Input id = "btnAdd" type = "button" value = "add" runat = "server" onserverclick = "XmlAdd"/>
<Input id = "btnDelete" type = "button" value = "delete" runat = "server" onserverclick = "XmlDelete"/>
<Input id = "btnUpdate" type = "button" value = "update" runat = "server" onserverclick = "XmlUpdate"/>
<Input id = "btnQuery" type = "button" value = "query" runat = "server" onserverclick = "XmlQuery"/>
</Form>
</Body>
</Html>
<% @ Page Language = "C #" AutoEventWireup = "true" CodeFile = "Default. aspx. cs" Inherits = "test_Default" %>
<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> C # Xml (add, delete, modify, and query) exercises </title>
</Head>
<Body>
<Form id = "form1" runat = "server">
<Div id = "showXml" runat = "server">
Show Xml document
</Div>
<Div style = "background-color: Green; color: Yellow;" style = "background-color: Green; color: Yellow; "> two key points for binding server controls to html controls: <br/>
1. onserverclick = "serverMethod" only write the method name here. <br/>
2. Background code, which must be <br/>
Protected void XmlAdd (object sender, EventArgs e) {}< br/>
Pay attention to the two parameters and the protection level.
</Div>
<Input id = "btnAdd" type = "button" value = "add" runat = "server" onserverclick = "XmlAdd"/>
<Input id = "btnDelete" type = "button" value = "delete" runat = "server" onserverclick = "XmlDelete"/>
<Input id = "btnUpdate" type = "button" value = "update" runat = "server" onserverclick = "XmlUpdate"/>
<Input id = "btnQuery" type = "button" value = "query" runat = "server" onserverclick = "XmlQuery"/>
</Form>
</Body>
</Html>

Background:
Copy codeThe Code is as follows:
Using System;
Using System. Data;
Using System. Configuration;
Using System. Collections;
Using System. Web;
Using System. Web. Security;
Using System. Web. UI;
Using System. Web. UI. WebControls;
Using System. Web. UI. WebControls. WebParts;
Using System. Web. UI. HtmlControls;
Using System. Xml;
Public partial class test_Default: System. Web. UI. Page
{
String xmlFile = System. Configuration. ConfigurationManager. deleettings ["xmlFile"];
XmlDocument XmlDoc = new XmlDocument ();
Protected void Page_Load (object sender, EventArgs e)
{
Bind ();
}
Private void Bind ()
{
XmlDoc. Load (Server. MapPath ("../" + xmlFile ); //
This. showXml. InnerHtml = System. Web. HttpUtility. HtmlEncode (XmlDoc. InnerXml );
}
Protected void XmlAdd (object sender, EventArgs e)
{
XmlNode objRootNode = XmlDoc. SelectSingleNode ("// Root"); // declare the XmlNode object
XmlElement objChildNode = XmlDoc. CreateElement ("Student"); // create an XmlElement object
ObjChildNode. SetAttribute ("id", "1 ");
ObjRootNode. AppendChild (objChildNode );
//
XmlElement objElement = XmlDoc. CreateElement ("Name ");//??? What are the differences between nodes and elements? The methods are the same.
ObjElement. InnerText = "tree1 ";
ObjChildNode. AppendChild (objElement );
// Save
XmlDoc. Save (Server. MapPath ("../" + xmlFile ));
}
Protected void XmlDelete (object sender, EventArgs e)
{
String Node = "// Root/Student [Name = 'tree1 ']"; // Xml is case sensitive.
XmlDoc. SelectSingleNode (Node). ParentNode. RemoveChild (XmlDoc. SelectSingleNode (Node ));
// Save
XmlDoc. Save (Server. MapPath ("../" + xmlFile ));
}
Protected void XmlUpdate (object sender, EventArgs e)
{
// XmlDoc. SelectSingleNode ("// Root/Student [Name = 'tree1 ']/Name"). InnerText = "tree2 ";
XmlDoc. SelectSingleNode ("// Root/Student [Name = 'tree1 ']"). Attributes ["id"]. Value = "001 ";
// Save
XmlDoc. Save (Server. MapPath ("../" + xmlFile ));
}
Protected void XmlQuery (object sender, EventArgs e)
{
XmlNodeList NodeList = XmlDoc. SelectNodes ("// Root/Student"); // query all student nodes
// Cyclically traverse the node to check whether the node exists
For (int I = 0; I <NodeList. Count; I ++)
{
Response. Write (NodeList [I]. ChildNodes [0]. InnerText );
}
// Query a single node. // It indicates all matching elements./It indicates the child element of the root. The query in javascript is the same.
String XmlPathNode = "// Root/Student [Name = 'Rock ']/Photo ";
Response. Write (XmlDoc. SelectSingleNode (XmlPathNode). InnerText );
}
}
Using System;
Using System. Data;
Using System. Configuration;
Using System. Collections;
Using System. Web;
Using System. Web. Security;
Using System. Web. UI;
Using System. Web. UI. WebControls;
Using System. Web. UI. WebControls. WebParts;
Using System. Web. UI. HtmlControls;
Using System. Xml;
Public partial class test_Default: System. Web. UI. Page
{
String xmlFile = System. Configuration. ConfigurationManager. deleettings ["xmlFile"];
XmlDocument XmlDoc = new XmlDocument ();
Protected void Page_Load (object sender, EventArgs e)
{
Bind ();
}
Private void Bind ()
{
XmlDoc. Load (Server. MapPath ("../" + xmlFile ); //
This. showXml. InnerHtml = System. Web. HttpUtility. HtmlEncode (XmlDoc. InnerXml );
}
Protected void XmlAdd (object sender, EventArgs e)
{
XmlNode objRootNode = XmlDoc. SelectSingleNode ("// Root"); // declare the XmlNode object
XmlElement objChildNode = XmlDoc. CreateElement ("Student"); // create an XmlElement object
ObjChildNode. SetAttribute ("id", "1 ");
ObjRootNode. AppendChild (objChildNode );
//
XmlElement objElement = XmlDoc. CreateElement ("Name ");//??? What are the differences between nodes and elements? The methods are the same.
ObjElement. InnerText = "tree1 ";
ObjChildNode. AppendChild (objElement );
// Save
XmlDoc. Save (Server. MapPath ("../" + xmlFile ));
}
Protected void XmlDelete (object sender, EventArgs e)
{
String Node = "// Root/Student [Name = 'tree1 ']"; // Xml is case sensitive.
XmlDoc. SelectSingleNode (Node). ParentNode. RemoveChild (XmlDoc. SelectSingleNode (Node ));
// Save
XmlDoc. Save (Server. MapPath ("../" + xmlFile ));
}
Protected void XmlUpdate (object sender, EventArgs e)
{
// XmlDoc. SelectSingleNode ("// Root/Student [Name = 'tree1 ']/Name"). InnerText = "tree2 ";
XmlDoc. SelectSingleNode ("// Root/Student [Name = 'tree1 ']"). Attributes ["id"]. Value = "001 ";
// Save
XmlDoc. Save (Server. MapPath ("../" + xmlFile ));
}
Protected void XmlQuery (object sender, EventArgs e)
{
XmlNodeList NodeList = XmlDoc. SelectNodes ("// Root/Student"); // query all student nodes
// Cyclically traverse the node to check whether the node exists
For (int I = 0; I <NodeList. Count; I ++)
{
Response. Write (NodeList [I]. ChildNodes [0]. InnerText );
}
// Query a single node. // It indicates all matching elements./It indicates the child element of the root. The query in javascript is the same.
String XmlPathNode = "// Root/Student [Name = 'Rock ']/Photo ";
Response. Write (XmlDoc. SelectSingleNode (XmlPathNode). InnerText );
}
}

Xml file
Copy codeThe Code is as follows:
<? Xml version = "1.0" encoding = "gb2312"?>
<Root>
<Student Admin = "no">
<Name> rock </Name>
<NickName> rock1 </NickName>
<Pwd> 123 </Pwd>
<Sex> boys </Sex>
<Birthday> 1986-1-1 </Birthday>
<Email> xymac@163.com </Email>
<QQ> 123374355 </QQ>
<Msn> loveplc@live.cn </Msn>
<Tel> 13005129336 </Tel>
<Homepage> http://www.jb51.net </Homepage>
<Address> Guangzhou </Address>
<Work> asp.net cainiao </Work>
<Photo> images/rock.gif </Photo>
<Time> 10:15:29 </Time>
</Student>
<Student Admin = "yes">
<Name> tree </Name>
<NickName> dormitory boss </NickName>
<Pwd> 51 aspx </Pwd>
<Sex> boys </Sex>
<Birthday>
</Birthday>
<Email> support@tree.com </Email>
<QQ>
</QQ>
<Msn>
</Msn>
<Tel>
</Tel>
<Homepage>
</Homepage>
<Address>
</Address>
<Work>
</Work>
<Photo>
</Photo>
<Time> 11:39:57 </Time>
</Student>
<Student>
<Name> tree2 </Name>
</Student>
<Student id = "001">
<Name> tree1 </Name>
</Student>
</Root>

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