/********* 程序设计目的：往已经存在的XML文件中添加新的节点，并把节点读出来显示在列表框中，同时练习怎么删除节点。 ********//********* 一共用了一个窗体，四个按纽，一个列表框 ********//********* 主要运用的System.Xml命名空间的类的属性和方法 ********/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 操作XML文件{ public partial class Form1 : Form { public Form1() { InitializeComponent(); }
private void btnLoopXml_Click(object sender, EventArgs e) { //Clear ListBox listBox1XmlNodes.Items.Clear();
//Load the XML document XmlDocument document = new XmlDocument(); document.Load(@"C:/Documents and Settings/Administrator/My Documents/Visual Studio 2005/Projects/XMLFile1.xml");
//Loop XML document recurseXmlDocument((XmlNode)document.DocumentElement, 0);
}
//读出节点并显示出来 private void recurseXmlDocument(XmlNode root, int indent) { //Make sure we don't do anything if the root is null if (root == null) { return; } if (root is XmlElement) //Root is an XmlElement type { //first print the name listBox1XmlNodes.Items.Add(root.Name.PadLeft(root.Name.Length + indent));
//Then check if there are any child nodes and if there are,call this //method anain to print them if (root.HasChildNodes) { recurseXmlDocument(root.FirstChild, indent + 2); }
//Finally check tosee if there are any siblings and if there are //call this method again to have them printed if (root.NextSibling != null) recurseXmlDocument(root.NextSibling, indent); } else if(root is XmlText) { //Print the text string text = ((XmlText)root).Value; listBox1XmlNodes.Items.Add(text.PadLeft(text.Length+indent)); } else if(root is XmlComment) { //print text string text = root.Value; listBox1XmlNodes.Items.Add(text.PadLeft(text.Length+indent));
//Then check if there are any child nodes,and jf there are //method again to print them if(root.HasChildNodes) { recurseXmlDocument(root.FirstChild,indent+2); } //Finally,check to see if there are any siblings,and if there are //call this method again to have them printed. if (root.NextSibling!=null) { recurseXmlDocument(root.NextSibling,indent); } } }
private void button1_Click(object sender, EventArgs e) { MessageBox.Show("关闭窗口！"); this.Close(); }
//添加节点 private void btnCreateNode_Click(object sender, EventArgs e) { //Load the XML document XmlDocument document = new XmlDocument(); document.Load(@"C:/Documents and Settings/Administrator/My Documents/Visual Studio 2005/Projects/XMLFile1.xml");
//Get the root element XmlElement root = document.DocumentElement;
//create the new nodes XmlElement newStory = document.CreateElement("story"); XmlElement newTitle = document.CreateElement("title"); XmlElement newAuthor = document.CreateElement("author"); XmlElement newName = document.CreateElement("name"); XmlElement newNationality = document.CreateElement("nationality"); XmlElement newRating = document.CreateElement("rating");
XmlComment comment = document.CreateComment("This story is the story you are reading!"); XmlText title = document.CreateTextNode("美丽人生"); XmlText name = document.CreateTextNode("王亚楠"); XmlText nationality = document.CreateTextNode("中国"); XmlText rating = document.CreateTextNode("智慧，美丽，时尚，活力");
//Insert the element newStory.AppendChild(comment); newStory.AppendChild(newTitle); newStory.AppendChild(newAuthor); newStory.AppendChild(newRating);
newTitle.AppendChild(title);
newAuthor.AppendChild(newName); newAuthor.AppendChild(newNationality);
newName.AppendChild(name); newNationality.AppendChild(nationality);
newRating.AppendChild(rating);
root.InsertAfter(newStory,root.LastChild); root.InsertAfter(newStory,root.FirstChild); document.Save(@"C:/Documents and Settings/Administrator/My Documents/Visual Studio 2005/Projects/XMLFile1.xml");
}
//删除节点 private void btnDeleteNode_Click_1(object sender, EventArgs e) { //Load XML document XmlDocument document = new XmlDocument(); document.Load(@"C:/Documents and Settings/Administrator/My Documents/Visual Studio 2005/Projects/XMLFile1.xml");
//Get the root element XmlElement root = document.DocumentElement; // Find the node.root is the <story>tag,soits last child //while will be the last <book> node. if (root.HasChildNodes) { XmlNode story = root.LastChild;
//Delete the child root.RemoveChild(story);
//Save the document story to disk document.Save(@"C:/Documents and Settings/Administrator/My Documents/Visual Studio 2005/Projects/XMLFile1.xml"); } }
}}
//本程序是先利用btnCreateNode按纽往XML文件中写入数据，然后再利用btnLoopXml按纽读出数据显示在列表框listBox1XmlNodes中//读数据时主要利用了recurseXmlDocument(XmlNode root, int indent)方法迭代XML中的元素//问题的关键在于recurseXmlDocument(XmlNode root, int indent)方法的编写
