/*********    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