ASP.NET对XML进行读，改，删操作代码

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user.xml内容如下：

<?xml version="1.0" encoding="GB2312"?>
<UserInfo>
<datarow>
<username>adsfasdfasdfaaaaaa</username>
<password>23451111111</password>
<study>高中</study>
</datarow>
<datarow>
<username>adsfasdfasdf</username>
<password>23451111111</password>
<study>高中</study>
</datarow>
<datarow>
<username>lingyubin222222</username>
<password>520520</password>
<study>大学</study>
</datarow>
<datarow>
<username>lingyubin1232</username>
<password>520520</password>
<study>大学</study>
</datarow>
<datarow>
<username>lingyubin123232</username>
<password>520520</password>
<study>大学</study>
</datarow>
<datarow>
<username>23213</username>
<password>3232332</password>
<study>高中</study>
</datarow>
<datarow>
<username>3423123</username>
<password>3213</password>
<study>小学</study>
</datarow>
</UserInfo>

WebForm.aspx内容：

<%@ Page language="c#" Codebehind="WebForm2.aspx.cs" AutoEventWireup="false" Inherits="StudyTest.新博机试题.WebForm2" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm2</title>
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<table cellSpacing="0" cellPadding="0" align="center" border="0">
<tr>
<td>用户名：
<asp:textbox id="TextBox1" runat="server"></asp:textbox></td>
<td>密码：<asp:textbox id="Textbox2" runat="server"></asp:textbox>
</td>
<td>学历：
<asp:dropdownlist id="DropDownList1" runat="server">
<asp:ListItem Value="大学">大学</asp:ListItem>
<asp:ListItem Value="高中">高中</asp:ListItem>
<asp:ListItem Value="小学">小学</asp:ListItem>
</asp:dropdownlist></td>
<td><asp:button id="btn_Add" runat="server" Text="增加"></asp:button></td>
</tr>
</table>
<br>
<br>
<table cellSpacing="0" cellPadding="0" align="center" border="0">
<tr>
<td><asp:datagrid id="DataGrid1" runat="server" AutoGenerateColumns="False" BorderColor="#CCCCCC"
BorderStyle="None" BorderWidth="1px" BackColor="White" CellPadding="3">
<SelectedItemStyle Font-Bold="True" ForeColor="White" BackColor="#669999"></SelectedItemStyle>
<ItemStyle ForeColor="#000066"></ItemStyle>
<HeaderStyle Font-Bold="True" ForeColor="White" BackColor="#006699"></HeaderStyle>
<FooterStyle ForeColor="#000066" BackColor="White"></FooterStyle>
<Columns>
<asp:TemplateColumn>
<HeaderTemplate>
用户名
</HeaderTemplate>
<ItemTemplate>
<asp:Label id="Label1" runat="server">
<%#DataBinder.Eval(Container,"DataItem.username")%>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox Runat=server ID="Textbox3" Text='<%#DataBinder.Eval(Container,"DataItem.username")%>'>
</asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn>
<HeaderTemplate>
密码
</HeaderTemplate>
<ItemTemplate>
<asp:Label id="Label2" runat="server">
<%#DataBinder.Eval(Container,"DataItem.password")%>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox id="Textbox4" runat="server" Text='<%#DataBinder.Eval(Container,"DataItem.password")%>'>
</asp:TextBox>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn>
<HeaderTemplate>
学历
</HeaderTemplate>
<ItemTemplate>
<asp:Label id="Label3" runat="server">
<%#DataBinder.Eval(Container,"DataItem.study")%>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList id="Dropdownlist2" runat="server">
<asp:ListItem Value="大学">大学</asp:ListItem>
<asp:ListItem Value="高中">高中</asp:ListItem>
<asp:ListItem Value="小学">小学</asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:EditCommandColumn ButtonType="LinkButton" UpdateText="更新" CancelText="取消" EditText="编辑"></asp:EditCommandColumn>
<asp:ButtonColumn Text="删除" CommandName="Delete"></asp:ButtonColumn>
</Columns>
</asp:datagrid></td>
</tr>
</table>
</form>
</body>
</HTML>

WebForm.cs内容：

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.IO;

namespace StudyTest.新博机试题
{
/// <summary>
/// WebForm2 的摘要说明。
/// </summary>
public class WebForm2 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.TextBox TextBox1;
protected System.Web.UI.WebControls.TextBox Textbox2;
protected System.Web.UI.WebControls.DropDownList DropDownList1;
protected System.Web.UI.WebControls.Button btn_Add;
protected System.Web.UI.WebControls.DataGrid DataGrid1;

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)
{
ReadXML();
}
}

#region 显示XML数据
private void ReadXML()
{
string url = Server.MapPath("user.xml");//获得当前文件夹下的XML文件
StreamReader sRead = new StreamReader(url,System.Text.Encoding.GetEncoding("GB2312"));//以一种特定的编码从字节流读取字符,必须要转化成GB2312读取才不能出乱码
XmlDataDocument datadoc = new XmlDataDocument();//操作XML文档
datadoc.DataSet.ReadXml(sRead);//将读取的字节流存到DataSet里面去
this.DataGrid1.DataSource = datadoc.DataSet.Tables[0].DefaultView;
DataGrid1.DataKeyField="username";//以username建立索引
this.DataGrid1.DataBind();
datadoc = null;//清空对XML数据的操作
sRead.Close();//关闭字节流的读取
}
#endregion

#region Web 窗体设计器生成的代码
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.btn_Add.Click += new System.EventHandler(this.btn_Add_Click);
this.DataGrid1.CancelCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_CancelCommand);
this.DataGrid1.EditCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_EditCommand);
this.DataGrid1.UpdateCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_UpdateCommand);
this.DataGrid1.DeleteCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_DeleteCommand);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

#region 往XML插入数据
private void btn_Add_Click(object sender, System.EventArgs e)
{
string url = Server.MapPath("user.xml");
string str_username = this.TextBox1.Text.ToString();
string str_password = this.Textbox2.Text.ToString();
string str_study = this.DropDownList1.SelectedValue.ToString();
try
{
XmlDocument xmlDoc=new XmlDocument();
xmlDoc.Load(url); //加载XML文档
XmlNode root=xmlDoc.SelectSingleNode("UserInfo");//查找第一个匹配的XmlNode
XmlElement xe1=xmlDoc.CreateElement("datarow");//创建第一个节点的第一个元素

XmlElement xesub1=xmlDoc.CreateElement("username"); //创建第一个节点的第一个元素里的属性
xesub1.InnerText=str_username;//设置文本节点
xe1.AppendChild(xesub1);//将指定节点添加到该节点的子节点列表的末尾
XmlElement xesub2=xmlDoc.CreateElement("password");
xesub2.InnerText=str_password;
xe1.AppendChild(xesub2);
XmlElement xesub3=xmlDoc.CreateElement("study");
xesub3.InnerText=str_study;
xe1.AppendChild(xesub3);

root.AppendChild(xe1);
xmlDoc.Save (url);//保存XML文件

ReadXML();
}
catch (Exception ex)
{
Response.Write(ex.ToString());
}

}
#endregion

#region 编辑取消

private void DataGrid1_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
this.DataGrid1.EditItemIndex = e.Item.ItemIndex;
ReadXML();
}

private void DataGrid1_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
this.DataGrid1.EditItemIndex = -1;
ReadXML();
}
#endregion

#region 修改XML数据

private void DataGrid1_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
string url = Server.MapPath("user.xml");

string str_username=DataGrid1.DataKeys[e.Item.ItemIndex].ToString();

TextBox txt_username = (TextBox)e.Item.FindControl("Textbox3");
TextBox txt_password = (TextBox)e.Item.FindControl("Textbox4");
DropDownList drp_study=(DropDownList)e.Item.FindControl("DropDownList2");

XmlDocument xmlDoc=new XmlDocument();
xmlDoc.Load(url); //加载XML文件
XmlNode root=xmlDoc.SelectSingleNode("UserInfo");//查找UserInfo节点
XmlNodeList xnl=root.ChildNodes; //获取UserInfo下面所以子节点
for(int i=0;i<xnl.Count;i++)
{
XmlNodeList xnl11=xnl.Item(i).SelectNodes("username");//查找username下面节点集合
XmlElement xe=(XmlElement)xnl11.Item(0); //username节点下面的元素
if(xe.InnerText==str_username) //获取节点以及所有子集的串联值
{
xe.InnerText=txt_username.Text;
xe.ParentNode.ChildNodes.Item(1).InnerText=txt_password.Text;
xe.ParentNode.ChildNodes.Item(2).InnerText=drp_study.SelectedValue;
}

}
xmlDoc.Save(url);
this.DataGrid1.EditItemIndex = -1;
ReadXML();

}
#endregion

#region 删除XML数据

private void DataGrid1_DeleteCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
string url = Server.MapPath("user.xml");

string str_username=DataGrid1.DataKeys[e.Item.ItemIndex].ToString();

XmlDocument xmlDoc=new XmlDocument();
xmlDoc.Load(url); //加载XML文件
XmlNode root=xmlDoc.SelectSingleNode("UserInfo");//查找UserInfo节点
XmlNodeList xnl=root.ChildNodes; //获取UserInfo下面所以子节点
for(int i=0;i<xnl.Count;i++)
{
XmlNodeList xnl11=xnl.Item(i).SelectNodes("username");//查找username下面节点集合
XmlElement xe=(XmlElement)xnl11.Item(0); //username节点下面的元素
if(xe.InnerText==str_username) //获取节点以及所有子集的串联值
{

root.RemoveChild(xe.ParentNode);//移除指顶节点
//xe.ParentNode.RemoveChild(xe);
//xnl.Item(i).RemoveChild(xe);
//if(i<xnl.Count)i=i-1;
}
}
xmlDoc.Save(url);
ReadXML();
}
#endregion