C#操作xml文件(增、删、改、查)

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

<% @Pagelanguage="c#"Codebehind="Main.aspx.cs"AutoEventWireup="false"Inherits="DsAndXML.OpXMLFile.Main" %>
<! DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.0Transitional//EN" >
< HTML >
< HEAD >
< title > Main </ title >
< meta name ="GENERATOR" Content ="MicrosoftVisualStudio7.0" >
< 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

<? xmlversion="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 > 2004-7-1215:07:39 </ STime >
</ User >
< User >
< Name > Guset </ Name >
< City > 上海 </ City >
< Email > [email protected] </ Email >
</ User >
< User >
< Name > Guset </ Name >
< City > 上海 </ 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>
///Main的摘要说明。
///</summary>
publicclassMain:System.Web.UI.Page
{
protectedSystem.Web.UI.WebControls.ButtonbtnQuery;
protectedSystem.Web.UI.WebControls.ButtonbtnChange;
protectedSystem.Web.UI.WebControls.ButtonbtnDelete;
protectedSystem.Web.UI.WebControls.ButtonbtnAdd;
protectedSystem.Web.UI.WebControls.DropDownListddlName;
protectedSystem.Web.UI.WebControls.LabelLabel1;
protectedSystem.Web.UI.WebControls.LabelLabel2;
protectedSystem.Web.UI.WebControls.LabellbEmail;
protectedSystem.Web.UI.WebControls.TextBoxtbNewMail;
protectedSystem.Web.UI.WebControls.LabelLabel3;
protectedSystem.Web.UI.WebControls.DataGriddgShow;

privatevoidPage_Load(objectsender,System.EventArgse)
{
//在此处放置用户代码以初始化页面
if(!IsPostBack)
Bind();

}
privatevoidBind()
{
DataSetds=newDataSet();
ds.ReadXml(Server.MapPath(".\\db\\dbGuest.xml"));
dgShow.DataSource=ds.Tables[0].DefaultView;
dgShow.DataBind();
XmlDocumentdoc=newXmlDocument();
doc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
XmlNodeListelemList=doc.GetElementsByTagName("Name");
ddlName.Items.Clear();
for(inti=0;i<elemList.Count;i++)
ddlName.Items.Add(elemList[i].InnerXml);

}

WebFormDesignergeneratedcode#regionWebFormDesignergeneratedcode
overrideprotectedvoidOnInit(EventArgse)
{
//
//CODEGEN：该调用是ASP.NETWeb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>
privatevoidInitializeComponent()
{
this.btnQuery.Click+=newSystem.EventHandler(this.btnQuery_Click);
this.btnChange.Click+=newSystem.EventHandler(this.btnChange_Click);
this.btnDelete.Click+=newSystem.EventHandler(this.btnDelete_Click);
this.btnAdd.Click+=newSystem.EventHandler(this.btnAdd_Click);
this.Load+=newSystem.EventHandler(this.Page_Load);

}
#endregion

privatevoidbtnQuery_Click(objectsender,System.EventArgse)
{
XmlDocumentdoc=newXmlDocument();
doc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
lbEmail.Text=doc.SelectSingleNode("//User[Name='"+ddlName.SelectedItem.Text+"']").ChildNodes.Item(2).InnerText;

}

privatevoidbtnChange_Click(objectsender,System.EventArgse)
{
XmlDocumentxmlDoc=newXmlDocument();
xmlDoc.Load(Server.MapPath(".\\db\\dbGuest.xml"));
XmlNodeListnodeList=xmlDoc.SelectSingleNode("dbGuest").ChildNodes;//获取dbGuest节点的所有子节点
foreach(XmlNodexninnodeList)//遍历所有子节点
{
XmlElementxe=(XmlElement)xn;//将子节点类型转换为XmlElement类型

XmlNodeListnode=xe.GetElementsByTagName("Name");
if(node.Count>0)
{

if(node[0].InnerText==ddlName.SelectedItem.Text)
border-right: #808080 1px solid; border-top: #808080 1px solid; display: none; border

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基本算法 | C# 快捷键大全

• 2008-03-07 19:23
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