XML处理-1

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1.设置xml文件 XMLFile.xml

<?xml version="1.0" encoding="utf-8"?>
<DocumentElement>
<Students>
    <ID>1</ID>
    <NAME>雅琴</NAME>
    <Phone>0101010101</Phone>
    <Address>沈阳新区乐闻街</Address>
    <City>沈阳</City>
</Students>
<Students>
    <ID>2</ID>
    <NAME>浩宇</NAME>
    <Phone>2323232323</Phone>
    <Address>天津崇文门</Address>
    <City>天津</City>
</Students>
<Students>
    <ID>3</ID>
    <NAME>乐凯</NAME>
    <Phone>7878787878</Phone>
    <Address>永安欣欣城</Address>
    <City>上海</City>
</Students>
<Students>
    <ID>4</ID>
    <NAME>张余宁</NAME>
    <Phone>15866668559</Phone>
    <Address>徐家新城</Address>
    <City>杭州</City>
</Students>
</DocumentElement>

2.新建网站-空网站

添加WEB窗体

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="xxx.Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
     <h3>修改和删除XML文档节点</h3>
        <asp:GridView ID="GridView1" runat="server" BackColor="White"
            BorderColor="#E7E7FF" BorderWidth="1px" CellPadding="3"
            GridLines="Horizontal" BorderStyle="None">
            <AlternatingRowStyle BackColor="#F7F7F7" />
            <FooterStyle BackColor="#B5C7DE" ForeColor="#4A3C8C" />
            <HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#F7F7F7" />
            <PagerStyle BackColor="#E7E7FF" ForeColor="#4A3C8C" HorizontalAlign="Right" />
            <RowStyle BackColor="#E7E7FF" ForeColor="#4A3C8C" />
            <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="#F7F7F7" />
            <SortedAscendingCellStyle BackColor="#F4F4FD" />
            <SortedAscendingHeaderStyle BackColor="#5A4C9D" />
            <SortedDescendingCellStyle BackColor="#D8D8F0" />
            <SortedDescendingHeaderStyle BackColor="#3E3277" />
        </asp:GridView>
        请选择节点<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True">
        </asp:DropDownList>
         <asp:Button ID="Button2" runat="server" Text="删除"
         onclick="Button2_Click" />
        <br />
        新节点名<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:Button ID="Button1"
            runat="server" Text="修改" onclick="Button1_Click" />
    </form>
</body>
</html>

后台代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml;
using System.Data;

namespace xxx{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                DataSet ds = new DataSet();
                ds.ReadXml(Server.MapPath("XMLFile.xml"));
                GridView1.DataSource = ds;
                GridView1.DataBind();
                DropDownList1.DataSource = ds;
                DropDownList1.DataTextField = "NAME";
                DropDownList1.DataBind();
            }
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
        XmlDocument doc = new XmlDocument();
        doc.Load(Server.MapPath("XMLFile.xml"));
        XmlNodeList node;
        XmlElement root = doc.DocumentElement;
        node = root.SelectNodes("descendant::basic[NAME='"+DropDownList1 .Text .Trim ()+"']");
        foreach (XmlNode n in node)
        {
            root.RemoveChild(n);
        }
        Response.Write("<script>alert('删除节点成功!')</script>");
        doc.Save(Server.MapPath("XMLFile.xml"));

    }

        protected void Button1_Click(object sender, EventArgs e)
        {
        XmlDocument doc = new XmlDocument();
        doc.Load(Server.MapPath("XMLFile.xml"));
        XmlNodeList xnl = doc.SelectSingleNode("DocumentElement").ChildNodes; ;//获取NewDataSet节点的所有子节点
        foreach (XmlNode xn in xnl)//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.Name == "Students")//判断节点名为Table
            {
                XmlNodeList xnlChild = xe.ChildNodes;//继续获取xe子节点的所有子节点
                foreach (XmlNode xnChild in xnlChild)//遍历
                {
                    XmlElement xeChild = (XmlElement)xnChild;//转换类型
                    if (xeChild.Name == "NAME" && xeChild.InnerText == this.DropDownList1.SelectedValue.Trim())
                    {
                        xeChild.InnerText = TextBox1.Text.Trim();
                        Response.Write("<script>alert('修改成功')</script>");
                    }
                }
            }
        }
        doc.Save(Server.MapPath("XMLFile.xml"));
        Response.Write("<script>location='Default.aspx'</script>");
        }
    }
}

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