简单读写XML文件

IPAddress.xml   文件如下：

<?xml version="1.0" encoding="utf-8"?>

<IP>

      <IPAddress>192.168.0.120</IPAddress>

</IP>

 

在 Form 窗体(读取XML配置.Designer.cs)中有如下控件：

        private  System.Windows.Forms.Button  button1;          //“读取”按钮

        private  System.Windows.Forms.Button  button2;          //“修改”按钮

        private  System.Windows.Forms.TextBox  textBox1;     // 用于显示和修改IP地址

        private  System.Windows.Forms.Label  label1;              // 显示“IP地址：”

        private  System.Windows.Forms.Button  button3;          // “保存”按钮

 

读取XML配置.cs  文件如下：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

//myself

using System.Xml;



namespace CS_Test

{

    public partial class 读取XML配置 : Form

    {

        public 读取XML配置()

        {

            InitializeComponent();

        }



        XmlDocument doc = null;

        XmlNodeList nodeList = null;

        string path =null;

        //读取

        private void button1_Click(object sender, EventArgs e)

        {

            doc = new XmlDocument();

            //读取文件地址

            path = Application.StartupPath.ToString();

            //MessageBox.Show(path);

            int n = path.LastIndexOf("bin\\Debug");

            path = path.Substring(0, n);

            doc.Load((path + "IPAddress.xml"));

            MessageBox.Show(path + "IPAddress.xml");



            if (doc != null)

            {

               nodeList = doc.GetElementsByTagName("IPAddress");

               textBox1.Text =

                  nodeList[0].FirstChild.Value.ToString();

            }

        }

        //修改

        private void button2_Click(object sender, EventArgs e)

        {

            textBox1.ReadOnly = false;

        }

        //保存

        private void button3_Click(object sender, EventArgs e)

        {

            string newIP = textBox1.Text.ToString();

            if (nodeList != null)

            {

                if (textBox1.Text.Trim() != "")

                {

                    //通过根节点创建新元素

                    XmlNode n = doc.CreateTextNode(textBox1.Text.Trim());

                    //通过父节点替换子节点

                    nodeList[0].ReplaceChild(n,nodeList[0].FirstChild);

                    doc.Save(path + "IPAddress.xml");

                    MessageBox.Show("IP地址修改成功！");

                    textBox1.ReadOnly = true;

                }

            }

        }

    }

    class ProgramXML

    {

        static void Main(string[] args)

        {

            Application.Run(new 读取XML配置());

        }

    }

}