XML _ Operations

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. IO;
Using system. xml;

Namespace xmldom
{
/// <Summary>
/// Summary of webform1.
/// </Summary>
Public class webform1: system. Web. UI. Page
{
Protected system. Web. UI. webcontrols. textbox textbox1;
Protected system. Web. UI. webcontrols. textbox textbox2;
Protected system. Web. UI. webcontrols. textbox textbox3;
Protected system. Web. UI. webcontrols. Button button1;
Protected system. Web. UI. webcontrols. DataGrid datagrid1;
 
Private void page_load (Object sender, system. eventargs E)
{
// Place user code here to initialize the page
Readxml ();
}

Private void readxml ()
{
String url = server. mappath ("user. xml"); // obtain the XML file in the current folder
Streamreader sread = new streamreader (URL, system. text. encoding. getencoding ("gb2312"); // read characters from the byte stream with a specific encoding. garbled characters cannot be obtained only after being converted to gb2312.
Xmldatadocument datadoc = new xmldatadocument (); // operate XML documents
Datadoc. dataset. readxml (sread); // Save the read byte stream to dataset.
This. datagrid1.datasource = datadoc. dataset. Tables [0]. defaultview;
Datagrid1.datakeyfield = "username"; // create an index with Username
This. datagrid1.databind ();
Datadoc = NULL; // clear the XML data operation
Sread. Close (); // close byte stream reading

}

# Code generated by region web Form Designer
Override protected void oninit (eventargs E)
{
//
// Codegen: This call is required by the ASP. NET web form designer.
//
Initializecomponent ();
Base. oninit (E );
}

/// <Summary>
/// The designer supports the required methods-do not use the code editor to modify
/// Content of this method.
/// </Summary>
Private void initializecomponent ()
{
This. Maid + = new system. Web. UI. webcontrols. Fig cancelcommand );
This. Maid + = new system. Web. UI. webcontrols. Maid (this. Maid editcommand );
This. Maid + = new system. Web. UI. webcontrols. Maid (this. Maid updatecommand );
This. Maid + = new system. Web. UI. webcontrols. Maid (this. Maid deletecommand );
This. button1.click + = new system. eventhandler (this. button#click );
This. Load + = new system. eventhandler (this. page_load );

}
# Endregion

Private void datagrid1_deletecommand (Object source, system. Web. UI. webcontrols. datagridcommandeventargs E)
{
String url = server. mappath ("user. xml ");
String str_username = maid [E. Item. itemindex]. tostring ();
Xmldocument xmldoc = new xmldocument ();
Xmldoc. Load (URL); // load the XML file
Xmlnode root = xmldoc. selectsinglenode ("userinfo"); // find the userinfo Node
Xmlnodelist xnl = root. childnodes; // obtain the subnode under userinfo
For (INT I = 0; I <xnl. Count; I ++)
{
Xmlnodelist xnl11 = xnl. Item (I). selectnodes ("username"); // find the node set under Username
Xmlelement Xe = (xmlelement) xnl11.item (0); // elements under the username Node
If (Xe. innertext = str_username) // gets the serial values of nodes and all subsets.
{

Root. removechild (Xe. parentnode); // remove the finger-top node
// Xe. parentnode. removechild (xe );
// Xnl. Item (I). removechild (xe );
// If (I <xnl. Count) I = I-1;
}
}
Xmldoc. Save (URL );
Readxml ();

}

Private void button#click (Object sender, system. eventargs E)
{
String url = server. mappath ("user. xml ");
String str_username = This. textbox1.text. tostring ();
String str_password = This. textbox2.text. tostring ();
String str_study = This. textbox3.text. tostring ();
Try
{
Xmldocument xmldoc = new xmldocument ();
Xmldoc. Load (URL); // load the XML document
Xmlnode root = xmldoc. selectsinglenode ("userinfo"); // find the First Matching xmlnode
Xmlelement xe1 = xmldoc. createelement ("datarow"); // create the first element of the first node

Xmlelement xesub1 = xmldoc. createelement ("username"); // create attributes in the first element of the first node
Xesub1.innertext = str_username; // set the text node
Xe1.appendchild (xesub1); // Add the specified node to the end of the node's subnode list
Xmlelement xesub2 = xmldoc. createelement ("password ");
Xesub2.innertext = str_password;
Xe1.appendchild (xesub2 );
Xmlelement xesub3 = xmldoc. createelement ("study ");
Xesub3.innertext = str_study;
Xe1.appendchild (xesub3 );

Root. appendchild (xe1 );
Xmldoc. Save (URL); // Save the XML file

Readxml ();
}
Catch (exception ex)
{
Response. Write (ex. tostring ());
}

}

Private void datagrid1_editcommand (Object source, system. Web. UI. webcontrols. datagridcommandeventargs E)
{
This. datagrid1.edititemindex = E. Item. itemindex;
Readxml ();
}

Private void datagrid1_cancelcommand (Object source, system. Web. UI. webcontrols. datagridcommandeventargs E)
{
This. Maid =-1;
Readxml ();
}

Private void datagrid1_updatecommand (Object source, system. Web. UI. webcontrols. datagridcommandeventargs E)
{
String url = server. mappath ("user. xml ");
String str_username = maid [E. Item. itemindex]. tostring ();

Textbox txt_username = (textbox) (E. Item. cells [2]. controls [0]);
Textbox txt_password = (textbox) (E. Item. cells [3]. controls [0]);
Textbox drp_study = (textbox) (E. Item. cells [4]. controls [0]);

Xmldocument xmldoc = new xmldocument ();
Xmldoc. Load (URL); // load the XML file
Xmlnode root = xmldoc. selectsinglenode ("userinfo"); // find the userinfo Node
Xmlnodelist xnl = root. childnodes; // obtain the subnode under userinfo
For (INT I = 0; I <xnl. Count; I ++)
{
Xmlnodelist xnl11 = xnl. Item (I). selectnodes ("username"); // find the node set under Username
Xmlelement Xe = (xmlelement) xnl11.item (0); // elements under the username Node
If (Xe. innertext = str_username) // gets the serial values of nodes and all subsets.
{
Xe. innertext = txt_username.text;
Xe. parentnode. childnodes. Item (1). innertext = txt_password.text;
Xe. parentnode. childnodes. Item (2). innertext = drp_study.text;
}

}
Xmldoc. Save (URL );
This. Maid =-1;
Readxml ();

}
}
}