Form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;

namespace Demo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        static public string strName = "";//记录读取时XML文件路径
        static public string strOne = "";//定义两个变量保存文本框内的值
        static public string strTwo = "";
        static public string strThree = "";//保存子标记名称
        static public string strFour = "";//保存第二个子节点的属性名
        static public string strFive = "";//保存第二个节点的属性值
        static public string strSix = "";//保存节点路径

        private XmlDocument xmlDocument = new XmlDocument();
        private XmlNode xmlNode;
        private XmlElement xmlElement;
        DataSet dataSet = new DataSet();//声明此数据集，存储读取出的XML数据

        private void button1_Click(object sender, EventArgs e)
        {
            //添加XML的声明部分
            xmlNode = xmlDocument.CreateNode(XmlNodeType.XmlDeclaration, "", "");
            xmlDocument.AppendChild(xmlNode);

            //添加一个根节点
            xmlElement = xmlDocument.CreateElement("", textBox1.Text, "");
            xmlDocument.AppendChild(xmlElement);

            //添加一个带属性值的次根节点
            XmlNode mainNode = xmlDocument.SelectSingleNode(textBox1.Text);
            XmlElement ElementTwo = xmlDocument.CreateElement(textBox2.Text);
            ElementTwo.SetAttribute(textBox3.Text, textBox4.Text);
            mainNode.AppendChild(ElementTwo);

            //在当前节点添加一个仅带值的节点
            XmlNode mainNodeOne = xmlDocument.SelectSingleNode(@textBox1.Text + "/" + textBox2.Text);
            XmlElement ElementThree = xmlDocument.CreateElement(textBox5.Text);
            ElementThree.InnerText = textBox6.Text;
            mainNodeOne.AppendChild(ElementThree);

            //在根节点下，添加第二个子节点
            XmlNode mainNodeTwo = xmlDocument.SelectSingleNode(textBox1.Text);
            XmlElement ElementFour = xmlDocument.CreateElement(textBox7.Text);
            ElementFour.SetAttribute(textBox10.Text, textBox8.Text);
            mainNodeTwo.AppendChild(ElementFour);
            strFour = textBox10.Text;