XML文档的增删改查

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XML文档的增删改查

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;//这里要添加空间引用

namespace XMLTest

{

publicpartial class Form1 : Form

{

publicForm1()

{

InitializeComponent();

}

privatevoid Form1_Load(objectsender, EventArgs e)

{

}

//创建XML文档

privatevoid btnCreate_Click(objectsender, EventArgs e)

{

XmlDocumentxmlDoc = new XmlDocument();

//建立Xml的定义声明

XmlDeclarationdec = xmlDoc.CreateXmlDeclaration("1.0","GB2312", null);

xmlDoc.AppendChild(dec);

//创建根节点

XmlElementroot = xmlDoc.CreateElement("Books");

xmlDoc.AppendChild(root);

//创建根节点的子节点Book

XmlNodebook = xmlDoc.CreateElement("Book");

//创建Book的子节点

XmlElementtitle = xmlDoc.CreateElement("Title");

title.InnerText = "SQLServer";

book.AppendChild(title);

XmlElementisbn = xmlDoc.CreateElement("ISBN");

isbn.InnerText = "444444";

book.AppendChild(isbn);

XmlElementauthor = xmlDoc.CreateElement("Author");

author.InnerText = "jia";

book.AppendChild(author);

XmlElementprice = xmlDoc.CreateElement("Price");

price.InnerText = "120";

price.SetAttribute("Unit", "-FCKpd-0quot");

book.AppendChild(price);

//将Book添加到根节点上

root.AppendChild(book);

//保存文档（如果已经存在该文件，则更新之；如果没有，则创建该文件）

xmlDoc.Save(@"F:/my files/project/产品说明/系统流程图/我的文档/讨论/Books.xml");

}

//插入新的节点

privatevoid btnInsert_Click(objectsender, EventArgs e)

{

XmlDocumentxmlDoc = new XmlDocument();

xmlDoc.Load(@"F:/my files/project/产品说明/系统流程图/我的文档/讨论/Books.xml");

XmlNoderoot = xmlDoc.SelectSingleNode("Books");

XmlElementbook = xmlDoc.CreateElement("Book");

book.SetAttribute("face", "red");

XmlElementtitle = xmlDoc.CreateElement("Title");

title.InnerText = "XML";

book.AppendChild(title);

XmlElementisbn = xmlDoc.CreateElement("ISBN");

isbn.InnerText = "555555";

book.AppendChild(isbn);

XmlElementauthor = xmlDoc.CreateElement("Author");

author.InnerText = "fengyafei";

book.AppendChild(author);

XmlElementprice = xmlDoc.CreateElement("Price");

price.InnerText = "100";

price.SetAttribute("Unit", "-FCKpd-0quot");

book.AppendChild(price);

root.AppendChild(book);

xmlDoc.Save(@"F:/my files/project/产品说明/系统流程图/我的文档/讨论/Books2.xml");

}

//更改节点、元素和属性

privatevoid btnUpdate_Click(objectsender, EventArgs e)

{

XmlDocumentxmlDoc = new XmlDocument();

xmlDoc.Load(@"F:/my files/project/产品说明/系统流程图/我的文档/讨论/Books.xml");

//获取Books节点的所有子节点

XmlNodeListlist = xmlDoc.SelectSingleNode("Books//Book").ChildNodes;

//遍历所有子节点

foreach(XmlNode node inlist)

{

//将子节点类型转换为XmlElement类型

XmlElement xe = (XmlElement)node;

if (xe.Name == "Author")

{

xe.InnerText = "along";

}

if (xe.GetAttribute("Unit")== "-FCKpd-0quot")

{

xe.SetAttribute("Unit", "$");

}

//保存

xmlDoc.Save(@"F:/my files/project/产品说明/系统流程图/我的文档/讨论/Books3.xml");

}

//删除节点、元素或属性

privatevoid btnDelete_Click(objectsender, EventArgs e)

{

XmlDocumentxmlDoc = new XmlDocument();

xmlDoc.Load(@"F:/my files/project/产品说明/系统流程图/我的文档/讨论/Books.xml");

//获取Books节点的所有子节点

XmlNodeListlist = xmlDoc.SelectSingleNode("Books//Book").ChildNodes;

//遍历所有子节点

foreach (XmlNode nodein list)

{

//将子节点类型转换为XmlElement类型

XmlElement xe = (XmlElement)node;

if (xe.Name == "Author")

{

xe.RemoveAll();

}

if (xe.GetAttribute("Unit")== "-FCKpd-0quot")

{

xe.RemoveAttribute("Unit");

break;//删除后直接退出来

}

//保存

xmlDoc.Save(@"F:/my files/project/产品说明/系统流程图/我的文档/讨论/Books4.xml");

}

//用XmlTextReader读取XML文档

privatevoid btnRead_Click(objectsender, EventArgs e)

{

stringfileName = @"F:/my files/project/产品说明/系统流程图/我的文档/讨论/Books.xml";

XmlTextReaderreader = new XmlTextReader(fileName);

stringstr = string.Empty;

while(reader.Read())

{

if (reader.NodeType == XmlNodeType.Element)

{

if (reader.LocalName.Equals("Title")|| reader.LocalName.Equals("Author"))

{

str +=reader.ReadString() + " ";

}

MessageBox.Show(str);

}

//用XmlTextWriter写入（不是插入，写入会覆盖文档中已有的所有节点）节点

privatevoid btnWrite_Click(objectsender, EventArgs e)

{

stringfileName = @"F:/my files/project/产品说明/系统流程图/我的文档/讨论/Books.xml";

XmlTextWriterwriter = new XmlTextWriter(fileName,null);

writer.Formatting = Formatting.Indented;

writer.Indentation = 6;

writer.WriteStartDocument();

writer.WriteStartElement("Books");

writer.WriteStartElement("Book");

writer.WriteElementString("Title","Window Form");

writer.WriteElementString("ISBN","111111");

writer.WriteElementString("Author","amandag");

writer.WriteStartElement("Price");

writer.WriteAttributeString("Unit","￥");

writer.WriteValue("128.00");

writer.WriteEndElement();

writer.WriteStartElement("Book");

writer.WriteElementString("Title","ASP.NET");

writer.WriteElementString("ISBN","222222");

writer.WriteElementString("Author","moon");

writer.WriteStartElement("Price");

writer.WriteAttributeString("Unit", "___FCKpd___0quot");

writer.WriteValue("111.00");

writer.WriteEndElement();

writer.WriteEndDocument();

writer.Close();

}