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XML 增、删、改和查示例【XML教程】,XML,增删改查

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1.已知有一个XML文件（bookstore.xml）以下： 

<?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>节点中插进去一个<book>节点：

   XmlDocument xmlDoc=new XmlDocument();
   xmlDoc.Load("bookstore.xml");
   XmlNode root=xmlDoc.SelectSingleNode("bookstore");//查找<bookstore>
   XmlElement xe1=xmlDoc.CreateElement("book");//建立一个<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从入门到通晓";//设置文本节点
   xe1.AppendChild(xesub1);//增加到<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);//增加到<bookstore>节点中
   xmlDoc.Save("bookstore.xml");

//================
效果为：

<?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从入门到通晓</title>
    <author>候捷</author>
    <price>58.3</price>
  </book>
</bookstore>

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

  XmlNodeList nodeList=xmlDoc.SelectSingleNode("bookstore").ChildNodes;//猎取bookstore节点的一切子节点
   foreach(XmlNode xn in nodeList)//遍历一切子节点
   {
    XmlElement xe=(XmlElement)xn;//将子节点范例转换为XmlElement范例
    if(xe.GetAttribute("genre")=="李赞红")//假如genre属性值为“李赞红”
    {
     xe.SetAttribute("genre","update李赞红");//则修正该属性为“update李赞红”

     XmlNodeList nls=xe.ChildNodes;//继承猎取xe子节点的一切子节点
     foreach(XmlNode xn1 in nls)//遍历
     {
      XmlElement xe2=(XmlElement)xn1;//转换范例
      if(xe2.Name=="author")//假如找到
      {
       xe2.InnerText="亚胜";//则修正
       break;//找到退出来就能够了
      }
     }
     break;
    }
   }

   xmlDoc.Save("bookstore.xml");//保留。

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

末了效果为：

<?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从入门到通晓</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");

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

末了效果为：

<?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、显现一切数据。

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

   XmlNodeList xnl=xn.ChildNodes;

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

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

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">新邮件地点：</asp:Label>
      <asp:Label id="Label2" style="Z-INDEX: 107; LEFT: 333px; POSITION: absolute; TOP: 274px" runat="server" Width="83px" Height="21px">邮件地点：</asp:Label>
          <asp:Button id="btnAdd" style="Z-INDEX: 104; LEFT: 298px; POSITION: absolute; TOP: 324px" runat="server" Text="增加"></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="修正"></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 的择要申明。
    /// </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)
        {
            // 在此处安排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;//猎取dbGuest节点的一切子节点
            foreach(XmlNode xn in nodeList)//遍历一切子节点
            {
                XmlElement xe=(XmlElement)xn;//将子节点范例转换为XmlElement范例
            
                XmlNodeList node = xe.GetElementsByTagName("Name");
                if(node.Count>0)
                {

                    if(node[0].InnerText==ddlName.SelectedItem.Text)
                    {
                        XmlNodeList nls=xe.ChildNodes;//继承猎取xe子节点的一切子节点
                        foreach(XmlNode xn1 in nls)//遍历
                        {
                            XmlElement xe2=(XmlElement)xn1;//转换范例
                            if(xe2.Name=="Email")//假如找到
                            {
                                xe2.InnerText=tbNewMail.Text;//则修正
                                break;//找到退出来就能够了
                            }
                        }
                        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");//建立一个<User>节点
            XmlElement xesub1=xmlDoc.CreateElement("Name");
            xesub1.InnerText="Guset";//设置文本节点
            xe1.AppendChild(xesub1);//增加到<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);//增加到<dbGuest>节点中
            xmlDoc.Save(Server.MapPath(".\\db\\dbGuest.xml"));
            Bind();
        }
    }
}

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