xml入门

 

C#中操作XML

Posted on 2006-12-22 16:26 Net_Learner 阅读(179) 评论(0)  编辑 收藏 所属分类: NET

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>[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>
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>
    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
Web Form Designer generated code 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="[email protected]";
            xe1.AppendChild(xesub3);
 
            root.AppendChild(xe1);
//添加到<dbGuest>节点中
            xmlDoc.Save(Server.MapPath(".""db""dbGuest.xml"));
            Bind();
        }
    }
}

XmlNodeList xlist = xmlDoc.SelectNodes(@"//Student[Age[text()='18 ']]");

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