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：

代码         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：

代码

 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());
         }
     }
 } 