XML读写演示程序(2)

 

 

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.Diagnostics;
using System.Xml;
using System.IO;

namespace 读写xml
{
    public partial class Form1 : Form
    {
        String xmlPath = Application.StartupPath + "\\demo.xml";

        XmlDocument xmlDoc = new XmlDocument();
        public Form1()
        {
            InitializeComponent();
        }

        ******* void button2_Click(object sender, EventArgs e)
        {
           
            xmlDoc.Load(xmlPath);
            XmlNode root = xmlDoc.SelectSingleNode("bookstore");//查找<bookstore>
            XmlElement xe1 = xmlDoc.CreateElement("book");//创建一个<book>节点
            xe1.SetAttribute("genre", "李赞红");//设置该节点genre属性
            xe1.SetAttribute("ISBN", "2-3631-4");//设置该节点ISBN属性

            XmlElement xesub1 = xmlDoc.CreateElement("title");
            xesub1.InnerText = "CS从入门到精通";//设置文本节点
            xe1.AppendChild(xesub1);//添加到<book>节点中
            XmlElement xesub2 = xmlDoc.CreateElement("author");
            xesub2.InnerText = "候捷";
            xe1.AppendChild(xesub2);
            XmlElement xesub3 = xmlDoc.CreateElement("price");
            xesub3.InnerText = "58.3";
            xe1.AppendChild(xesub3);

            root.AppendChild(xe1);//添加到<bookstore>节点中
            xmlDoc.Save(xmlPath);
            webBrowser1.Navigate(xmlPath);

        }

        ******* void button3_Click(object sender, EventArgs e)
        {
            File.Copy(Application.StartupPath + "\\demo1.xml", xmlPath,true);
            webBrowser1.Navigate(xmlPath);
        }

        ******* void button4_Click(object sender, EventArgs e)
        {
            //修改节点属性
            xmlDoc.Load(xmlPath);
            XmlNodeList nodeList = xmlDoc.SelectSingleNode("bookstore").ChildNodes;//获取bookstore节点的所有子节点
            foreach (XmlNode xn in nodeList)//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.GetAttribute("genre") == "李赞红")//如果genre属性值为“李赞红”
                {
                    xe.SetAttribute("genre", "update李赞红");//则修改该属性为“update李赞红”

                    XmlNodeList nls = xe.ChildNodes;//继续获取xe子节点的所有子节点
                    foreach (XmlNode xn1 in nls)//遍历
                    {
                        XmlElement xe2 = (XmlElement)xn1;//转换类型
                        if (xe2.Name == "author")//如果找到
                        {
                            xe2.InnerText = "亚胜";//则修改
                            break;//找到退出来就可以了
                        }
                    }
                    break;
                }
            }

            xmlDoc.Save(xmlPath);//保存。
            webBrowser1.Navigate(xmlPath);

        }

        ******* void button5_Click(object sender, EventArgs e)
        {
            xmlDoc.Load(xmlPath);
            XmlNodeList xnl=xmlDoc.SelectSingleNode("bookstore").ChildNodes;
 
           foreach(XmlNode xn in xnl)
           {
            XmlElement xe=(XmlElement)xn;
            if (xe.GetAttribute("genre") == "fantasy")
            {
                xe.RemoveAttribute("genre");//删除genre属性
            }
            else if (xe.GetAttribute("genre") == "update李赞红")
            {
                xe.RemoveAll();//删除该节点的全部内容
            }
           }
           xmlDoc.Save(xmlPath);
           webBrowser1.Navigate(xmlPath);

        }

        ******* void button6_Click(object sender, EventArgs e)
        {
            String str1 = null;

            XmlDocument myxml = new XmlDocument();
            myxml.Load(xmlPath);

            XmlNode xn = myxml.SelectSingleNode("bookstore");

            XmlNodeList xnl = xn.ChildNodes;

            foreach (XmlNode xnf in xnl)
            {
                XmlElement xe = (XmlElement)xnf;
                str1 += xe.GetAttribute("genre");
                str1 += Environment.NewLine;
                str1 += xe.GetAttribute("ISBN");
                str1 += Environment.NewLine;

                XmlNodeList xnf1 = xe.ChildNodes;
                foreach (XmlNode xn2 in xnf1)
                {
                   
                    str1 += xn2.InnerText;
                    str1 += Environment.NewLine;

                }
            }
            MessageBox.Show(str1);

        }

        ******* void Form1_Load(object sender, EventArgs e)
        {
            webBrowser1.Navigate(xmlPath);

        }

    }
}
 

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