1. It is known that there is an XML file (bookstore.xml) as follows:
<?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:
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 Zanhong");//Set the node's genre attribute
xe1.SetAttribute("ISBN","2-3631-4");//Set the ISBN attribute of the node
XmlElement xesub1=xmlDoc.CreateElement("title");
xesub1.InnerText="CS from beginner to proficient";//Set text nodes
xe1.AppendChild(xesub1);//Add to <book> node
XmlElement xesub2=xmlDoc.CreateElement("author");
xesub2.InnerText="houjie";
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:
<?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="李zanhong" ISBN="2-3631-4">
<title>CS from entry to master</title>
<author>Houjie</author>
<price>58.3</price>
</book>
</bookstore>
2. Modify the node: Change the genre value of the node whose genre attribute value is "Li Zanhong" to "updateLi Zanhong", and modify the text of the child node <author> of this node to "Ya Sheng".
XmlNodeList nodeList=xmlDoc.SelectSingleNode("bookstore").ChildNodes;//Get all child nodes of the bookstore node
foreach(XmlNode xn in nodeList)//Traverse all child nodes
{
XmlElement xe=(XmlElement)xn;//Convert the sub-node type to XmlElement type
if(xe.GetAttribute("genre")=="Li Zanhong")//If the genre attribute value is "Li Zanhong"
{
xe.SetAttribute("genre","update Li Zanhong");//Modify the attribute to "update Li Zanhong"
XmlNodeList nls=xe.ChildNodes;//Continue to obtain all child nodes of xe child node
foreach(XmlNode xn1 in nls)//Traverse
{
XmlElement xe2=(XmlElement)xn1;//Conversion type
if(xe2.Name=="author")//If found
{
xe2.InnerText="Yasheng";//Modify
break;//Just find it and exit.
}
}
break;
}
}
xmlDoc.Save("bookstore.xml");//Save.
//==================
The final result is:
<?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李zanhong" ISBN="2-3631-4">
<title>CS from entry to master</title>
<author>Assault</author>
<price>58.3</price>
</book>
</bookstore>
3. Delete the genre attribute of the <book genre="fantasy" ISBN="2-3631-4"> node and delete the <book genre="update Li Zanhong" ISBN="2-3631-4"> node.
XmlNodeList xnl=xmlDoc.SelectSingleNode("bookstore").ChildNodes;
foreach(XmlNode xn in xnl)
{
XmlElement xe=(XmlElement)xn;
if(xe.GetAttribute("genre")=="fantasy")
{
xe.RemoveAttribute("genre");//Delete the genre attribute
}
else if(xe.GetAttribute("genre")=="updateLi Zanhong")
{
xe.RemoveAll();//Delete all contents of the node
}
}
xmlDoc.Save("bookstore.xml");
//====================
The final result is:
<?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 attribute value
Console.WriteLine(xe.GetAttribute("ISBN"));
XmlNodeList xnf1=xe.ChildNodes;
foreach(XmlNode xn2 in xnf1)
{
Console.WriteLine(xn2.InnerText);//Display child node text
}
}
Leave it for reference, original address http://blog.yesky.com/75/richsee/1211075.shtml
2 Front-end code: html
<%@ Page language="c#" Codebehind="Main.aspx.cs" AutoEventWireup="false" Inherits="DsAndXML.OpXMLFile.Main" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>Main</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content=" http://schemas.microsoft.com/intellisense/ie5 ">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Main" method="post" runat="server">
<FONT face="宋体">
<asp:DataGrid id="dgShow" style="Z-INDEX: 100; LEFT: 113px; POSITION: absolute; TOP: 32px" runat="server" Width="480px" Height="178px"></asp: DataGrid>
<asp:Label id="Label3" style="Z-INDEX: 111; LEFT: 187px; POSITION: absolute; TOP: 383px" runat="server" Width="120px" Height="21px">New email address: </asp:Label>
<asp:Label id="Label2" style="Z-INDEX: 107; LEFT: 333px; POSITION: absolute; TOP: 274px" runat="server" Width="83px" Height="21px">Email address:< /asp:Label>
<asp:Button id="btnAdd" style="Z-INDEX: 104; LEFT: 298px; POSITION: absolute; TOP: 324px" runat="server" Text="Add"></asp:Button>
<asp:Button id="btnDelete" style="Z-INDEX: 103; LEFT: 199px; POSITION: absolute; TOP: 324px" runat="server" Text="Delete"></asp:Button>
<asp:Button id="btnChange" style="Z-INDEX: 102; LEFT: 102px; POSITION: absolute; TOP: 382px" runat="server" Text="Modify"></asp:Button>
<asp:Button id="btnQuery" style="Z-INDEX: 101; LEFT: 101px; POSITION: absolute; TOP: 324px" runat="server" Text="Query"></asp:Button>
<asp:DropDownList id="ddlName" style="Z-INDEX: 105; LEFT: 210px; POSITION: absolute; TOP: 274px" runat="server" Width="95px" Height="78px"></asp: DropDownList>
<asp:Label id="Label1" style="Z-INDEX: 106; LEFT: 100px; POSITION: absolute; TOP: 274px" runat="server" Width="83px" Height="21px">Name:</ asp:Label>
<asp:Label id="lbEmail" style="Z-INDEX: 109; LEFT: 459px; POSITION: absolute; TOP: 274px" runat="server" Width="231px"></asp:Label>
<asp:TextBox id="tbNewMail" style="Z-INDEX: 110; LEFT: 330px; POSITION: absolute; TOP: 381px" runat="server" Width="208px" Height="26px"></asp: TextBox></FONT>
</form>
</body>
</HTML>XML file dbGuest.xml
<?xml version="1.0" standalone="yes"?>
<dbGuest>
<User>
<Name>aaa</Name>
<City>shanghai</City>
<Email>[email protected]</Email>
<Message>ok</Message>
<STime>2004-07-12T00:00:00.0000000+08:00</STime>
</User>
<User>
<Name>shaoazhd</Name>
<City>beijing</City>
<Email>[email protected]</Email>
<Message>afsa</Message>
<STime>2004-7-12 15:07:39</STime>
</User>
<User>
<Name>Guset</Name>
<City>Shanghai</City>
<Email>[email protected]</Email>
</User>
<User>
<Name>Guset</Name>
<City>Shanghai</City>
<Email>[email protected]</Email>
</User>
</dbGuest>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;
using System.Xml.XPath;
namespace DsAndXML.OpXMLFile
{
/**//// <summary>
/// Summary description of Main.
/// </summary>
public class Main : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button btnQuery;
protected System.Web.UI.WebControls.Button btnChange;
protected System.Web.UI.WebControls.Button btnDelete;
protected System.Web.UI.WebControls.Button btnAdd;
protected System.Web.UI.WebControls.DropDownList ddlName;
protected System.Web.UI.WebControls.Label Label1;
protected System.Web.UI.WebControls.Label Label2;
protected System.Web.UI.WebControls.Label lbEmail;
protected System.Web.UI.WebControls.TextBox tbNewMail;
protected System.Web.UI.WebControls.Label Label3;
protected System.Web.UI.WebControls.DataGrid dgShow;
private void Page_Load(object sender, System.EventArgs e)
{
//Put user code here to initialize the page
if(!IsPostBack)
Bind();
}
private void Bind()
{
DataSet ds = new DataSet();
ds.ReadXml(Server.MapPath(".\db\dbGuest.xml"));
dgShow.DataSource = ds.Tables[0].DefaultView;
dgShow.DataBind();
XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath(".\db\dbGuest.xml"));
XmlNodeList elemList = doc.GetElementsByTagName("Name");
ddlName.Items.Clear();
for(int i=0;i<elemList.Count;i++)
ddlName.Items.Add(elemList[i].InnerXml);
}
Web Form Designer generated code#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Forms designer.
//
InitializeComponent();
base.OnInit(e);
}
/**//// <summary>
/// Designer supports required methods - do not use code editor to modify
/// The content of this method.
/// </summary>
private void InitializeComponent()
{
this.btnQuery.Click += new System.EventHandler(this.btnQuery_Click);
this.btnChange.Click += new System.EventHandler(this.btnChange_Click);
this.btnDelete.Click += new System.EventHandler(this.btnDelete_Click);
this.btnAdd.Click += new System.EventHandler(this.btnAdd_Click);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void btnQuery_Click(object sender, System.EventArgs e)
{
XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath(".\db\dbGuest.xml"));
lbEmail.Text = doc.SelectSingleNode("//User[Name='"+ddlName.SelectedItem.Text+"']").ChildNodes.Item(2).InnerText;
}
private void btnChange_Click(object sender, System.EventArgs e)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath(".\db\dbGuest.xml"));
XmlNodeList nodeList=xmlDoc.SelectSingleNode("dbGuest").ChildNodes;//Get all child nodes of the dbGuest node
foreach(XmlNode xn in nodeList)//Traverse all child nodes
{
XmlElement xe=(XmlElement)xn;//Convert the sub-node type to XmlElement type
XmlNodeList node = xe.GetElementsByTagName("Name");
if(node.Count>0)
{
if(node[0].InnerText==ddlName.SelectedItem.Text)
{
XmlNodeList nls=xe.ChildNodes;//Continue to obtain all child nodes of xe child node
foreach(XmlNode xn1 in nls)//Traverse
{
XmlElement xe2=(XmlElement)xn1;//Conversion type
if(xe2.Name=="Email")//If found
{
xe2.InnerText=tbNewMail.Text;//Modify
break;//Just find it and exit.
}
}
break;
}
}
}
xmlDoc.Save(Server.MapPath(".\db\dbGuest.xml"));
Bind();
}
private void btnDelete_Click(object sender, System.EventArgs e)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath(".\db\dbGuest.xml"));
XmlNodeList xnl=xmlDoc.SelectSingleNode("dbGuest").ChildNodes;
foreach(XmlNode xn in xnl)
{
XmlElement xe=(XmlElement)xn;
XmlNodeList node = xe.GetElementsByTagName("Name");
if(node.Count>0)
{
if(node[0].InnerText==ddlName.SelectedItem.Text)
xe.RemoveAll();//Delete all contents of the node
break;
}
}
xmlDoc.Save(Server.MapPath(".\db\dbGuest.xml"));
Bind();
}
private void btnAdd_Click(object sender, System.EventArgs e)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath(".\db\dbGuest.xml"));
XmlNode root=xmlDoc.SelectSingleNode("dbGuest");//Find <dbGuest>
XmlElement xe1=xmlDoc.CreateElement("User");//Create a <User> node
XmlElement xesub1=xmlDoc.CreateElement("Name");
xesub1.InnerText="Guset";//Set text node
xe1.AppendChild(xesub1);//Add to <User> node
XmlElement xesub2=xmlDoc.CreateElement("City");
xesub2.InnerText="Shanghai";
xe1.AppendChild(xesub2);
XmlElement xesub3=xmlDoc.CreateElement("Email");
xesub3.InnerText=" [email protected] ";
xe1.AppendChild(xesub3);
root.AppendChild(xe1);//Add to <dbGuest> node
xmlDoc.Save(Server.MapPath(".\db\dbGuest.xml"));
Bind();
}
}
}
http://www.cnblogs.com/skylaugh/archive/2006/12/18/595634.html