用XmlDocument创建XML文档

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用XmlDocument创建XML文档
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Xml;
namespace XMLDOMDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void btnLoad_Click(object sender, EventArgs e)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load("Books.xml");
            MessageBox.Show(xmlDoc.InnerXml);
        }
        //创建文档
        private void btnCreate_Click(object sender, EventArgs e)
        {
            XmlDocument xmlDoc = new XmlDocument();
            //建立Xml的定义声明
            XmlDeclaration dec = xmlDoc.CreateXmlDeclaration("1.0", "GB2312", null);
            xmlDoc.AppendChild(dec);
            //创建根节点
            XmlElement root = xmlDoc.CreateElement("Books");
            xmlDoc.AppendChild(root);
            XmlNode book = xmlDoc.CreateElement("Book");
            XmlElement title = xmlDoc.CreateElement("Title");
            title.InnerText = "SQL Server";
            book.AppendChild(title);
            XmlElement isbn = xmlDoc.CreateElement("ISBN");
            isbn.InnerText = "444444";
            book.AppendChild(isbn);
            XmlElement author = xmlDoc.CreateElement("Author");
            author.InnerText = "jia";
            book.AppendChild(author);
            XmlElement price = xmlDoc.CreateElement("Price");
            price.InnerText = "120";
            price.SetAttribute("Unit", "___FCKpd___0quot;);
            book.AppendChild(price);
            root.AppendChild(book);
            xmlDoc.Save("Books.xml");
        }

        private void btnInsert_Click(object sender, EventArgs e)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load("Books.xml");
            XmlNode root = xmlDoc.SelectSingleNode("Books");
            XmlElement book = xmlDoc.CreateElement("Book");
            XmlElement title = xmlDoc.CreateElement("Title");
            title.InnerText = "XML";
            book.AppendChild(title);
            XmlElement isbn = xmlDoc.CreateElement("ISBN");
            isbn.InnerText = "333333";
            book.AppendChild(isbn);
            XmlElement author = xmlDoc.CreateElement("Author");
            author.InnerText = "snow";
            book.AppendChild(author);
            XmlElement price = xmlDoc.CreateElement("Price");
            price.InnerText = "120";
            price.SetAttribute("Unit", "___FCKpd___0quot;);
            book.AppendChild(price);
            root.AppendChild(book);
            xmlDoc.Save("Books.xml");
            MessageBox.Show("数据已写入！");
        }

        private void btnUpdate_Click(object sender, EventArgs e)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load("Books.xml");
            //"//Book[@Unit="$"]"
            //获取Books节点的所有子节点
            XmlNodeList nodeList = xmlDoc.SelectSingleNode("Books//Book").ChildNodes;
            //遍历所有子节点
            foreach (XmlNode xn in nodeList)
            {
                //将子节点类型转换为XmlElement类型
                XmlElement xe = (XmlElement)xn;
                if (xe.Name == "Author")
                {
                    xe.InnerText = "amandag";
                }
                if (xe.GetAttribute("Unit") == "___FCKpd___0quot;)
                {
                    xe.SetAttribute("Unit", "￥");
                }
            }
            xmlDoc.Save("Books.xml");
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load("Books.xml");
            XmlNodeList nodeList = xmlDoc.SelectSingleNode("Books//Book").ChildNodes;
            //遍历所有子节点
            foreach (XmlNode xn in nodeList)
            {
                //将子节点类型转换为XmlElement类型
                XmlElement xe = (XmlElement)xn;
                if (xe.Name == "Author")
                {
                    xe.RemoveAll();
                }
                if (xe.GetAttribute("Unit") == "￥")
                {
                    xe.RemoveAttribute("Unit");
                }
            }
            xmlDoc.Save("Books.xml");
        }
    }
}