c#操作xml文件 实例源码（增删改查）

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.IO;using System.Xml;namespace XMLFileOperate{ 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 Form1_Load(object sender, EventArgs e) { strName = "fileTwo.xml"; if (File.Exists(strName)) { ShowXml(); button3.Enabled = false; } else { button3.Enabled = true; } } //修改创建的XML文件 private void button7_Click(object sender, EventArgs e) { //修改第一个节点的属性 xmlDocument.Load(strName); XmlNode nodeOne = xmlDocument.SelectSingleNode("//" strThree); XmlElement ElementOne = (XmlElement)nodeOne; ElementOne.SetAttribute(attribute.Text, textBox4.Text); //修改第一个节点的值 XmlNode nodeTwo = xmlDocument.SelectSingleNode("//" strThree "/*"); XmlElement ElementTwo = (XmlElement)nodeTwo; ElementTwo.InnerText = nodeContent.Text; //修改第二个节点的属性值 XmlNode mainNodeThree = xmlDocument.SelectSingleNode("//" textBox7.Text "[@" strFour "='" strFive "']"); XmlElement ElementThree = (XmlElement)mainNodeThree; ElementThree.SetAttribute(textBox10.Text, textBox8.Text); //修改第二个节点的值 XmlNode nodeFour = xmlDocument.SelectSingleNode("//" textBox7.Text "[@" strFour "='" textBox8.Text "']/*"); XmlElement ElementFour = (XmlElement)nodeFour; ElementFour.InnerText = textBox11.Text; xmlDocument.Save(strName); MessageBox.Show("恭喜你，修改成功！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk); ShowXml(); } private void dataGridView1_SelectionChanged(object sender, EventArgs e) { //修改文本框的ReadOnly属性 readOnlytrue(); //选定DataGridView中的一条记录在文本框内显示 for (int i = 0; i < dataGridView1.Rows.Count; i ) //遍历DataGridView中的每一行信息 { if (dataGridView1.Rows[i].Selected)//判断该行是否被选中 { if (i <= 0) { nodeContent.Text = dataGridView1.Rows[i].Cells[childNode.Text].Value.ToString(); //在文本框内显示XML文件内的信息 textBox4.Text = dataGridView1.Rows[i].Cells[attribute.Text].Value.ToString(); strOne = nodeContent.Text; } if (i > 0) { textBox11.Text = dataGridView1.Rows[i].Cells[childNode.Text].Value.ToString(); textBox8.Text = dataGridView1.Rows[i].Cells[attribute.Text].Value.ToString(); strTwo = textBox11.Text; strFive = textBox8.Text; } } } //从指定路径加载XML文档 xmlDocument.Load(strName); //从根节点开始读取 XmlNode xNode = (XmlNode)xmlDocument.DocumentElement; root.Text = xNode.Name; //读取子节点的属性及内容 XmlNode nodeTwo = xmlDocument.SelectSingleNode(root.Text "/*"); firstNode.Text = nodeTwo.Name; textBox7.Text = firstNode.Text; strThree = firstNode.Text; //读取次子节点的名称及内容 XmlNode nodeThree = xmlDocument.SelectSingleNode(root.Text "/" firstNode.Text "/*"); childNode.Text = nodeThree.Name; textBox9.Text = childNode.Text; //读取指定节点的属性名 XmlNode nodeOne = xmlDocument.SelectSingleNode("//" firstNode.Text); XmlAttributeCollection xmlAttribute = nodeOne.Attributes; for (int i = 0; i < xmlAttribute.Count; i ) { if (i == 0) { attribute.Text = xmlAttribute.Item(i).Name; textBox10.Text = attribute.Text; strFour = textBox10.Text; } } } //自定义一个方法更改文本框的只读属性 private void readOnlytrue() { root.ReadOnly = true; childNode.ReadOnly = true; attribute.ReadOnly = true; firstNode.ReadOnly = true; textBox7.ReadOnly = true; textBox9.ReadOnly = true; textBox10.ReadOnly = true; } //选定DataGridView中的数据，进行删除操作 private void button2_Click(object sender, EventArgs e) { //判断是否有选中行 if (dataGridView1.SelectedRows.Count != 0) { xmlDocument.Load(strName); //通过循环获取选中行的XPath for (int i = 0; i < dataGridView1.Rows.Count; i ) //遍历DataGridView中的每一行信息 { if (dataGridView1.Rows[i].Selected)//判断该行是否被选中 { string attriString = dataGridView1.Rows[i].Cells[attribute.Text].Value.ToString(); strSix = root.Text "/" strThree "[@" strFour "='" attriString "']";//被选中节点的XPath } } string mainNode = strSix.Substring(0, strSix.LastIndexOf("/")); xmlDocument.SelectSingleNode(mainNode).RemoveChild(xmlDocument.SelectSingleNode(strSix));//从XML文件下移除节点的语句 xmlDocument.Save(strName); ShowXml(); } else { MessageBox.Show("暂无选中行，不能进行删除操作！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Warning); } } //添加记录到当前节点下 private void button1_Click(object sender, EventArgs e) { if (textBox6.Text != "") { xmlDocument.Load(strName); //添加节点的属性及属性值 XmlNode nodeOne = xmlDocument.SelectSingleNode(root.Text); XmlElement elementOne = xmlDocument.CreateElement(textBox6.Text); elementOne.SetAttribute(textBox3.Text, textBox1.Text); nodeOne.AppendChild(elementOne); //添加当前节点的子节点及节点内容 XmlNode nodeTwo = xmlDocument.SelectSingleNode("//" textBox6.Text "[@" strFour "='" textBox1.Text "']"); XmlElement elementTwo = xmlDocument.CreateElement(textBox2.Text); elementTwo.InnerText = textBox5.Text; nodeTwo.AppendChild(elementTwo); xmlDocument.Save(strName); MessageBox.Show("节点添加成功！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Asterisk); ShowXml(); } else { MessageBox.Show("节点内容不能为空！", "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Warning); } } //读取XML文件 public void ShowXml() { //读取XML文件信息 dataSet.Clear(); dataSet.ReadXml(strName); dataGridView1.DataSource = dataSet.Tables[0].DefaultView; } //创建一个XML文档 private void button3_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("", root.Text, ""); xmlDocument.AppendChild(xmlElement); //添加一个带属性值的次根节点 XmlNode mainNode = xmlDocument.SelectSingleNode(root.Text); XmlElement ElementTwo = xmlDocument.CreateElement(firstNode.Text); ElementTwo.SetAttribute(attribute.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(@root.Text "/" firstNode.Text); XmlElement ElementThree = xmlDocument.CreateElement(childNode.Text); ElementThree.InnerText = nodeContent.Text; mainNodeOne.AppendChild(ElementThree); //在根节点下，添加第二个子节点 XmlNode mainNodeTwo = xmlDocument.SelectSingleNode(root.Text); XmlElement ElementFour = xmlDocument.CreateElement(textBox7.Text); ElementFour.SetAttribute(textBox10.Text, textBox8.Text); mainNodeTwo.AppendChild(ElementFour); strFour = textBox10.Text; //在当前节点添加一个仅带值的节点 XmlNode mainNodeThree = xmlDocument.SelectSingleNode("//" textBox7.Text "[@" strFour "='" textBox8.Text "']"); XmlElement ElementFive = xmlDocument.CreateElement(textBox9.Text); ElementFive.InnerText = textBox11.Text; mainNodeThree.AppendChild(ElementFive); SaveFileDialog saveDialog = new SaveFileDialog(); saveDialog.Filter = "XML文件（*.XML）|*.XML"; if (saveDialog.ShowDialog() == DialogResult.OK) { xmlDocument.Save(saveDialog.FileName); } } }}