(转)使用XmlDocument类完成对XML的查、删、添、改 dodo

<%@ Page language="c#" Codebehind="xdoc.aspx.cs" AutoEventWireup="false" Inherits="XML.xdoc" %>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
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<HTML>
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<HEAD>
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<title>xdoc</title>
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</HEAD>
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<body MS_POSITIONING="GridLayout">
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<form id="Form1" method="post" runat="server">
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<FONT face="宋体">
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<asp:datagrid id="dg" style="Z-INDEX: 101; LEFT: 48px; POSITION: absolute; TOP: 56px" runat="server"
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ForeColor="Black" BorderStyle="None" BorderWidth="1px" BorderColor="#DEDFDE" BackColor="White"
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CellPadding="4" GridLines="Vertical" AutoGenerateColumns="False" Width="432px">
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<SelectedItemStyle Font-Bold="True" ForeColor="White" BackColor="#CE5D5A"></SelectedItemStyle>
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<AlternatingItemStyle BackColor="White"></AlternatingItemStyle>
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<ItemStyle BackColor="#F7F7DE"></ItemStyle>
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<HeaderStyle Font-Bold="True" ForeColor="White" BackColor="#6B696B"></HeaderStyle>
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<FooterStyle BackColor="#CCCC99"></FooterStyle>
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<Columns>
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<asp:BoundColumn DataField="name" HeaderText="名字"></asp:BoundColumn>
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<asp:BoundColumn DataField="City" HeaderText="城市"></asp:BoundColumn>
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<asp:BoundColumn DataField="Email" HeaderText="邮件地址"></asp:BoundColumn>
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<asp:BoundColumn DataField="Time" HeaderText="时间"></asp:BoundColumn>
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</Columns>
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<PagerStyle HorizontalAlign="Right" ForeColor="Black" BackColor="#F7F7DE" Mode="NumericPages"></PagerStyle>
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</asp:datagrid><asp:label id="Label1" style="Z-INDEX: 102; LEFT: 112px; POSITION: absolute; TOP: 8px" runat="server"
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Width="336px" BorderWidth="2px" BorderStyle="Ridge" Font-Size="X-Large" Font-Bold="True" ForeColor="Red">XmlDocument类的挖掘</asp:label><asp:dropdownlist id="ddl" style="Z-INDEX: 103; LEFT: 128px; POSITION: absolute; TOP: 280px" runat="server"></asp:dropdownlist><asp:label id="Label2" style="Z-INDEX: 104; LEFT: 64px; POSITION: absolute; TOP: 280px" runat="server">姓名：</asp:label><asp:button id="Button1" style="Z-INDEX: 105; LEFT: 64px; POSITION: absolute; TOP: 328px" runat="server"
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Width="64px" Text="查询"></asp:button><asp:label id="Label3" style="Z-INDEX: 106; LEFT: 64px; POSITION: absolute; TOP: 384px" runat="server">邮件地址：</asp:label><asp:button id="Button2" style="Z-INDEX: 107; LEFT: 152px; POSITION: absolute; TOP: 328px" runat="server"
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Width="64px" Text="删除"></asp:button><asp:button id="Button3" style="Z-INDEX: 108; LEFT: 432px; POSITION: absolute; TOP: 280px" runat="server"
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Width="56px" Text="添加" Height="80px"></asp:button><asp:textbox id="tbn" style="Z-INDEX: 109; LEFT: 152px; POSITION: absolute; TOP: 384px" runat="server"
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Width="328px"></asp:textbox><asp:button id="Button4" style="Z-INDEX: 110; LEFT: 64px; POSITION: absolute; TOP: 416px" runat="server"
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Width="424px" Text="修改邮件地址"></asp:button>
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<asp:TextBox id="tbna" style="Z-INDEX: 111; LEFT: 312px; POSITION: absolute; TOP: 280px" runat="server"
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Width="104px"></asp:TextBox>
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<asp:TextBox id="tbc" style="Z-INDEX: 112; LEFT: 312px; POSITION: absolute; TOP: 312px" runat="server"
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Width="104px" Height="24px"></asp:TextBox>
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<asp:TextBox id="tbe" style="Z-INDEX: 113; LEFT: 312px; POSITION: absolute; TOP: 344px" runat="server"
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Width="104px" Height="24px"></asp:TextBox>
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<asp:Label id="Label4" style="Z-INDEX: 114; LEFT: 264px; POSITION: absolute; TOP: 280px" runat="server">姓名：</asp:Label>
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<asp:Label id="Label5" style="Z-INDEX: 115; LEFT: 264px; POSITION: absolute; TOP: 312px" runat="server">城市：</asp:Label>
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<asp:Label id="Label6" style="Z-INDEX: 116; LEFT: 264px; POSITION: absolute; TOP: 344px" runat="server">Email：</asp:Label></FONT></form>
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</body>
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</HTML>
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using System;
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using System.Collections;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Web;
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using System.Web.SessionState;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.HtmlControls;
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//新引入两个命名空间
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using System.Xml;
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using System.Xml.XPath;
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namespace XML
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{
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/// <summary>
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/// xdoc 的摘要说明。
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/// </summary>
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public class xdoc : System.Web.UI.Page
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{
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protected System.Web.UI.WebControls.Label Label1;
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protected System.Web.UI.WebControls.Label Label2;
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protected System.Web.UI.WebControls.Button Button1;
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protected System.Web.UI.WebControls.Label Label3;
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protected System.Web.UI.WebControls.Button Button2;
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protected System.Web.UI.WebControls.Button Button3;
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protected System.Web.UI.WebControls.DataGrid dg;
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protected System.Web.UI.WebControls.DropDownList ddl;
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protected System.Web.UI.WebControls.TextBox tbn;
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protected System.Web.UI.WebControls.Label Label4;
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protected System.Web.UI.WebControls.Label Label5;
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protected System.Web.UI.WebControls.Label Label6;
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protected System.Web.UI.WebControls.TextBox tbna;
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protected System.Web.UI.WebControls.TextBox tbc;
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protected System.Web.UI.WebControls.TextBox tbe;
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protected System.Web.UI.WebControls.Button Button4;
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private void Page_Load(object sender, System.EventArgs e)
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{//看动作名字就知道了是载入了
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if(!Page.IsPostBack)
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{
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fill();
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}
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}
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Web 窗体设计器生成的代码
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private void fill()
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{//绑定方法
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DataSet ds=new DataSet();
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ds.ReadXml(Server.MapPath("\\xml\\xml\\doc.xml"));
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dg.DataSource=ds.Tables[0];
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dg.DataBind();
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XmlDocument xd=new XmlDocument();
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xd.Load(Server.MapPath("\\xml\\xml\\doc.xml"));
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System.Xml.XmlNodeList xnl=xd.GetElementsByTagName("Name");
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ddl.Items.Clear();
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for(int i=0;i<xnl.Count;i++)
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{
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ddl.Items.Add(xnl[i].InnerText);
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}
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}
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private void Button1_Click(object sender, System.EventArgs e)
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{//查询动作
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XmlDocument xd=new XmlDocument();
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xd.Load(Server.MapPath("\\xml\\xml\\doc.xml"));
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tbn.Text=xd.SelectSingleNode("//User[Name='"+ddl.SelectedItem.Text+"']").ChildNodes.Item(2).InnerText.ToString();
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}
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private void Button2_Click(object sender, System.EventArgs e)
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{//删除动作
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XmlDocument xdoc=new XmlDocument();
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xdoc.Load(Server.MapPath("\\xml\\xml\\doc.xml"));
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XmlNodeList xnl=xdoc.SelectSingleNode("dbGuest").ChildNodes;
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foreach(XmlNode xn in xnl)
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{
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XmlElement xe=(XmlElement)xn;
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XmlNodeList node=xe.GetElementsByTagName("Name");//查找他的Name行
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if(node.Count>0)
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{
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if(node[0].InnerText==ddl.SelectedItem.Text)//如果当前节点的名字和下拉列表传来的一样，就删除
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{
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xe.RemoveAll();//删除节点的所有指定属性和子集，但是不删除默认属性,我很郁闷，不知道怎么连属性一起删除，如果有朋友知道，请一定告诉我下，谢谢了！
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}
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break;
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}
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}
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xdoc.Save(Server.MapPath("\\xml\\xml\\doc.xml"));
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fill();
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}
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private void Button3_Click(object sender, System.EventArgs e)
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{//添加动作
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string name=this.tbna.Text.ToString();
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string city=this.tbc.Text.ToString();
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string email=this.tbe.Text.ToString();
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XmlDocument xd=new XmlDocument();
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xd.Load(Server.MapPath("\\xml\\xml\\doc.xml"));
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//查找dbGuest节点
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XmlNode xn=xd.SelectSingleNode("dbGuest");
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//创建user节点
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XmlElement xe_u=xd.CreateElement("User");
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//创建一个name元素
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XmlElement xe_a1=xd.CreateElement("Name");
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xe_a1.InnerText=name;//设置该元素的值
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xe_u.AppendChild(xe_a1);//把刚才创建的元素插入name节点里面去
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XmlElement xe_a2=xd.CreateElement("City");
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xe_a2.InnerText=city;
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xe_u.AppendChild(xe_a2);
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XmlElement xe_a3=xd.CreateElement("Email");
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xe_a3.InnerText=email;
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xe_u.AppendChild(xe_a3);
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XmlElement xe_a4=xd.CreateElement("Time");
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xe_a4.InnerText=(DateTime.Now).ToString();
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xe_u.AppendChild(xe_a4);
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//将User节点插入到dbGuest
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xn.AppendChild(xe_u);
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//保存XML文件
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xd.Save(Server.MapPath("\\xml\\xml\\doc.xml"));
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fill();
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}
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private void Button4_Click(object sender, System.EventArgs e)
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{//修改邮件地址动作
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XmlDocument xd=new XmlDocument();
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xd.Load(Server.MapPath("\\xml\\xml\\doc.xml"));//载入XML文件
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XmlNodeList xnl=xd.SelectSingleNode("dbGuest").ChildNodes;//获取dbGuest节点的全部子节点
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foreach(XmlNode xn in xnl)//迭代所有子节点
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{
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XmlElement xe=(XmlElement)xn;//将迭代到的子节点转换成XmlElement类型
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XmlNodeList xnl2=xe.GetElementsByTagName("Name");//返回所有Name列的数据
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if(xnl2.Count>0)//如果大于零就表示有撒，
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{
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if(xnl2[0].InnerText==ddl.SelectedItem.Text)//如果该列有和被下拉列表中返回的值一样的数据的话
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{
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XmlNodeList xnl3=xe.ChildNodes;//再获取下面所有的子节点
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foreach(XmlNode xn1 in xnl3)//再迭代子集
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{
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XmlElement xe2=(XmlElement)xn1;//转换类型
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if(xe2.Name=="Email")//如果节点名字是Email的话
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{
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xe2.InnerText=tbn.Text;//该节点的值就替换成文本框中的
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break;
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}
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}
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break;
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}
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}
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}
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xd.Save(Server.MapPath("\\xml\\xml\\doc.xml"));
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fill();
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}
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}
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}
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<?xml version="1.0" encoding="utf-8"?>
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<dbGuest>
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<User>
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<Name>天轰穿</Name>
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<City>江油</City>
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<Email>7665@fds.com</Email>
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<Time>2006-5-6 16:10:56</Time>
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</User>
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<User>
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<Name>田洪川</Name>
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<City>绵阳</City>
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<Email>th@DFs.com</Email>
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<Time>2006-5-6 16:06:51</Time>
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</User>
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<User>
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<Name>黄小梅</Name>
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<City>南充</City>
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<Email>5543@ds.com</Email>
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<Time>2006-5-6 16:07:15</Time>
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</User>
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</dbGuest>