XML 增、删、改和查示例-阿里云开发者社区

1.已知有一个XML文件（bookstore.xml）如下：

<?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、往<bookstore>节点中插入一个<book>节点：

XmlDocument xmlDoc=new XmlDocument();
xmlDoc.Load("bookstore.xml");
XmlNode root=xmlDoc.SelectSingleNode("bookstore");//查找<bookstore>
XmlElement xe1=xmlDoc.CreateElement("book");//创建一个<book>节点
xe1.SetAttribute("genre","李赞红");//设置该节点genre属性
xe1.SetAttribute("ISBN","2-3631-4");//设置该节点ISBN属性

XmlElement xesub1=xmlDoc.CreateElement("title");
xesub1.InnerText="CS从入门到精通";//设置文本节点
xe1.AppendChild(xesub1);//添加到<book>节点中
XmlElement xesub2=xmlDoc.CreateElement("author");
xesub2.InnerText="候捷";
xe1.AppendChild(xesub2);
XmlElement xesub3=xmlDoc.CreateElement("price");
xesub3.InnerText="58.3";
xe1.AppendChild(xesub3);

root.AppendChild(xe1);//添加到<bookstore>节点中
xmlDoc.Save("bookstore.xml");

//================
结果为：

<?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="李赞红" ISBN="2-3631-4">
<title>CS从入门到精通</title>
<author>候捷</author>
<price>58.3</price>
</book>
</bookstore>

2、修改节点：将genre属性值为“李赞红“的节点的genre值改为“update李赞红”，将该节点的子节点<author>的文本修改为“亚胜”。

XmlNodeList nodeList=xmlDoc.SelectSingleNode("bookstore").ChildNodes;//获取bookstore节点的所有子节点
foreach(XmlNode xn in nodeList)//遍历所有子节点
{
XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型
if(xe.GetAttribute("genre")=="李赞红")//如果genre属性值为“李赞红”
{
xe.SetAttribute("genre","update李赞红");//则修改该属性为“update李赞红”

XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点
foreach(XmlNode xn1 in nls)//遍历
{
XmlElement xe2=(XmlElement)xn1;//转换类型
if(xe2.Name=="author")//如果找到
{
xe2.InnerText="亚胜";//则修改
break;//找到退出来就可以了
}
}
break;
}
}

xmlDoc.Save("bookstore.xml");//保存。

//=================

最后结果为：

<?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李赞红" ISBN="2-3631-4">
<title>CS从入门到精通</title>
<author>亚胜</author>
<price>58.3</price>
</book>
</bookstore>

3、删除 <book genre="fantasy" ISBN="2-3631-4">节点的genre属性，删除 <book genre="update李赞红" ISBN="2-3631-4">节点。

XmlNodeList xnl=xmlDoc.SelectSingleNode("bookstore").ChildNodes;

foreach(XmlNode xn in xnl)
{
XmlElement xe=(XmlElement)xn;

if(xe.GetAttribute("genre")=="fantasy")
{
xe.RemoveAttribute("genre");//删除genre属性
}
else if(xe.GetAttribute("genre")=="update李赞红")
{
xe.RemoveAll();//删除该节点的全部内容
}
}
xmlDoc.Save("bookstore.xml");

//====================

最后结果为：

<?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、显示所有数据。

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

XmlNodeList xnl=xn.ChildNodes;

foreach(XmlNode xnf in xnl)
{
XmlElement xe=(XmlElement)xnf;
Console.WriteLine(xe.GetAttribute("genre"));//显示属性值
Console.WriteLine(xe.GetAttribute("ISBN"));

XmlNodeList xnf1=xe.ChildNodes;
foreach(XmlNode xn2 in xnf1)
{
Console.WriteLine(xn2.InnerText);//显示子节点点文本
}
}

留做参考,原文地址http://blog.yesky.com/75/richsee/1211075.shtml

2前台代码：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" >新邮件地址： </ asp:Label >

< asp:Label id ="Label2" style ="Z-INDEX: 107; LEFT: 333px; POSITION: absolute; TOP: 274px" runat ="server" Width ="83px" Height ="21px" >邮件地址： </ asp:Label >

< asp:Button id ="btnAdd" style ="Z-INDEX: 104; LEFT: 298px; POSITION: absolute; TOP: 324px" runat ="server" Text ="添加" ></ asp:Button >

< asp:Button id ="btnDelete" style ="Z-INDEX: 103; LEFT: 199px; POSITION: absolute; TOP: 324px" runat ="server" Text ="删除" ></ asp:Button >

< asp:Button id ="btnChange" style ="Z-INDEX: 102; LEFT: 102px; POSITION: absolute; TOP: 382px" runat ="server" Text ="修改" ></ asp:Button >

< asp:Button id ="btnQuery" style ="Z-INDEX: 101; LEFT: 101px; POSITION: absolute; TOP: 324px" runat ="server" Text ="查询" ></ 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" >姓名： </ 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文件dbGuest.xml

<? xml version="1.0" standalone="yes" ?>

< dbGuest >

< User >

< Name >aaa </ Name >

< City >shanghai </ City >

< Email >aaa@263.net </ Email >

< Message >ok </ Message >

< STime >2004-07-12T00:00:00.0000000+08:00 </ STime >

</ User >

< User >

< Name >shaoazhd </ Name >

< City >beijing </ City >

< Email >sss@22.net </ Email >

< Message >afsa </ Message >

< STime >2004-7-12 15:07:39 </ STime >

</ User >

< User >

< Name >Guset </ Name >

< City >上海 </ City >

< Email >sfaf@22.net </ Email >

</ User >

< User >

< Name >Guset </ Name >

< City >上海 </ City >

< Email >ss@22.net </ 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>

/// Main 的摘要说明。

/// </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)

{

// 在此处放置用户代码以初始化页面

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

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;//获取dbGuest节点的所有子节点

foreach(XmlNode xn in nodeList)//遍历所有子节点

{

XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型

XmlNodeList node = xe.GetElementsByTagName("Name");

if(node.Count>0)

{

if(node[0].InnerText==ddlName.SelectedItem.Text)

{

XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点

foreach(XmlNode xn1 in nls)//遍历

{

XmlElement xe2=(XmlElement)xn1;//转换类型

if(xe2.Name=="Email")//如果找到

{

xe2.InnerText=tbNewMail.Text;//则修改

break;//找到退出来就可以了

}

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();//删除该节点的全部内容

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");//查找<dbGuest>

XmlElement xe1=xmlDoc.CreateElement("User");//创建一个<User>节点

XmlElement xesub1=xmlDoc.CreateElement("Name");

xesub1.InnerText="Guset";//设置文本节点

xe1.AppendChild(xesub1);//添加到<User>节点中

XmlElement xesub2=xmlDoc.CreateElement("City");

xesub2.InnerText="上海";

xe1.AppendChild(xesub2);

XmlElement xesub3=xmlDoc.CreateElement("Email");

xesub3.InnerText="ss@22.net";

xe1.AppendChild(xesub3);

root.AppendChild(xe1);//添加到<dbGuest>节点中

xmlDoc.Save(Server.MapPath(".\\db\\dbGuest.xml"));

Bind();

}

本文转自高海东博客园博客，原文链接：http://www.cnblogs.com/ghd258/archive/2005/10/13/254218.html，如需转载请自行联系原作者

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