在C#中操作XML
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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
- }
- }
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>
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 codeWeb Form Designer generated code#region Web Form Designer generated code
- override protected void OnInit(EventArgs e)
- {
- //
- // CODEGEN:该调用是 ASP.NET Web 窗体设计器所必需的。
- //
- InitializeComponent();
- base.OnInit(e);
- }
- /**//**//**//// <summary>
- /// 设计器支持所需的方法 - 不要使用代码编辑器修改
- /// 此方法的内容。
- /// </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;//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();
- }
- }
- }
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