这是一个用c#控制台程序下, 用XmlDocument 进行XML操作的的例子,包含了查询、增加、修改、删除、保存的基本操作。较完整的描述了一个XML的整个操作流程。适合刚入门.net XML操作的朋友参考和学习。
假设有XML文件:books.xml
- <?xml version="1.0" encoding="UTF-8"?>
- <books>
- <book>
- <name>哈里波特</name>
- <price>10</price>
- <memo>这是一本很好看的书。</memo>
- </book>
- <book id="B02">
- <name>三国演义</name>
- <price>10</price>
- <memo>四大名著之一。</memo>
- </book>
- <book id="B03">
- <name>水浒</name>
- <price>6</price>
- <memo>四大名著之一。</memo>
- </book>
- <book id="B04">
- <name>红楼</name>
- <price>5</price>
- <memo>四大名著之一。</memo>
- </book>
- </books>
下面是为Program.cs
- using System;
- using System.Collections.Generic;
- using System.Text;
- using System.Xml;
-
- namespace TestXml
- {
- class Program
- {
- static void Main(string[] args)
- {
- XmlElement theBook = null, theElem = null, root = null;
- XmlDocument xmldoc = new XmlDocument();
- try
- {
- xmldoc.Load("Books.xml");
- root = xmldoc.DocumentElement;
-
-
- theBook = xmldoc.CreateElement("book");
- theElem = xmldoc.CreateElement("name");
- theElem.InnerText = "新书";
- theBook.AppendChild(theElem);
-
- theElem = xmldoc.CreateElement("price");
- theElem.InnerText = "20";
- theBook.AppendChild(theElem);
-
- theElem = xmldoc.CreateElement("memo");
- theElem.InnerText = "新书更好看。";
- theBook.AppendChild(theElem);
- root.AppendChild(theBook);
- Console.Out.WriteLine("--- 新建一本书开始 ----");
- Console.Out.WriteLine(root.OuterXml);
-
-
-
-
- theBook = (XmlElement)root.SelectSingleNode("/books/book[name=‘哈里波特‘]");
- Console.Out.WriteLine("--- 查找《哈里波特》 ----");
- Console.Out.WriteLine(theBook.OuterXml);
-
- theBook.GetElementsByTagName("price").Item(0).InnerText = "15";
- Console.Out.WriteLine("--- 此时修改这本书的价格 ----");
- Console.Out.WriteLine(theBook.OuterXml);
-
- theBook.SetAttribute("id", "B01");
- Console.Out.WriteLine("--- 另外还想加一个属性id,值为B01 ----");
- Console.Out.WriteLine(theBook.OuterXml);
-
-
-
- theBook = (XmlElement)root.SelectSingleNode("/books/book[@id=‘B02‘]");
- Console.Out.WriteLine("--- 要用id属性删除《三国演义》这本书 ----");
- Console.Out.WriteLine(theBook.OuterXml);
- theBook.ParentNode.RemoveChild(theBook);
- Console.Out.WriteLine("--- 删除后的XML ----");
- Console.Out.WriteLine(xmldoc.OuterXml);
-
-
- XmlNodeList someBooks = root.SelectNodes("/books/book[price<10]");
- Console.Out.WriteLine("--- 再将所有价格低于10的书删除 ---");
- Console.Out.WriteLine("--- 符合条件的书有 " + someBooks.Count + "本。 ---");
-
- for (int i = 0; i < someBooks.Count; i++)
- {
- someBooks.Item(i).ParentNode.RemoveChild(someBooks.Item(i));
- }
- Console.Out.WriteLine("--- 删除后的XML ----");
- Console.Out.WriteLine(xmldoc.OuterXml);
-
- xmldoc.Save("books.xml");
-
- Console.In.Read();
- }
- catch (Exception e)
- {
- Console.Out.WriteLine(e.Message);
- }
- }
- }
- }