.net读写xml文档详解

using System;
using System.Xml; 

namespace WriteXML
{
 class Class1
 {
  static void Main( string[] args )
  {
   try
   {
    // 创建XmlTextWriter类的实例对象
    XmlTextWriter textWriter = new XmlTextWriter("C:\\w3sky.xml", null);
    textWriter.Formatting = Formatting.Indented;

    // 开始写过程，调用WriteStartDocument方法
    textWriter.WriteStartDocument(); 

    // 写入说明
    textWriter.WriteComment("First Comment XmlTextWriter Sample Example");
    textWriter.WriteComment("w3sky.xml in root dir");  

    //创建一个节点
    textWriter.WriteStartElement("Administrator");
    textWriter.WriteElementString("Name", "formble");
    textWriter.WriteElementString("site", "w3sky.com");
    textWriter.WriteEndElement();

    // 写文档结束，调用WriteEndDocument方法
    textWriter.WriteEndDocument();

    // 关闭textWriter
    textWriter.Close();
   }
   catch(System.Exception e)
   {
    Console.WriteLine(e.ToString());
   }
  }

 }
}

using System;
using System.Xml; 

namespace ReadXml
{
    class Class1
    {
        static void Main( string[] args )
        {
            // 创建一个XmlTextReader类的对象并调用Read方法来读取XML文件
            XmlTextReader textReader  = new XmlTextReader("C:\\books.xml");
            textReader.Read();
            // 节点非空则执行循环体
            while ( textReader.Read() )
            {
                // 读取第一个元素
                textReader.MoveToElement();
                Console.WriteLine("XmlTextReader Properties Test");
                Console.WriteLine("==================="); 

                // 读取该元素的属性并显示在控制台中
                Console.WriteLine("Name:" + textReader.Name);
                Console.WriteLine("Base URI:" + textReader.BaseURI);
                Console.WriteLine("Local Name:" + textReader.LocalName);
                Console.WriteLine("Attribute Count:" + textReader.AttributeCount.ToString());
                Console.WriteLine("Depth:" + textReader.Depth.ToString());
                Console.WriteLine("Line Number:" + textReader.LineNumber.ToString());
                Console.WriteLine("Node Type:" + textReader.NodeType.ToString());
                Console.WriteLine("Attribute Count:" + textReader.Value.ToString());
            }
        }
    }
}

// 创建一个XmlDocument类的对象
XmlDocument doc = new XmlDocument();
doc.LoadXml(("<Student type='regular' Section='B'><Name>Tommy Lex</Name></Student>"));

// 保存到文件中
doc.Save("C:\\student.xml");

// 还可以通过改变Save方法中参数，将XML数据显示在控制台中，方法如下：
doc.Save(Console.Out);

下面的示例中，用到了一个XmlTextReader对象，通过它读取"books.xml"文件中的XML数据。然后创建一个XmlDocument对象并载入XmlTextReader对象，这样XML数据就被读到XmlDocument对象中了。最后，通过该对象的Save方法将XML数据显示在控制台中。

XmlDocument doc = new XmlDocument();
// 创建一个XmlTextReader对象，读取XML数据
XmlTextReader reader = new XmlTextReader("c:\\books.xml");
reader.Read();

// 载入XmlTextReader类的对象
doc.Load(reader);
// 将XML数据显示在控制台中
doc.Save(Console.Out);

<?xml version='1.0'?>
<!-- This file represents a fragment of a book store inventory database -->
<bookstore>
  <book genre="autobiography" publicationdate="1981" ISBN="1-861003-11-0">
    <title>The Autobiography of Benjamin Franklin</title>
    <author>
      <first-name>Benjamin</first-name>
      <last-name>Franklin</last-name>
    </author>
    <price>8.99</price>
  </book>
  <book genre="novel" publicationdate="1967" ISBN="0-201-63361-2">
    <title>The Confidence Man</title>
    <author>
      <first-name>Herman</first-name>
      <last-name>Melville</last-name>
    </author>
    <price>11.99</price>
  </book>
  <book genre="philosophy" publicationdate="1991" ISBN="1-861001-57-6">
    <title>The Gorgias</title>
    <author>
      <first-name>Sidas</first-name>
      <last-name>Plato</last-name>
    </author>
    <price>9.99</price>
  </book>
</bookstore>

//设置配置文件物理路径
    public string xmlPath = "/manage/spider/config.xml";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //设置程序物理路径+文件物理路径
            string path = Request.PhysicalApplicationPath + xmlPath;
            //获取XML元素对象
            XElement config = XElement.Load(path);
            if (config != null)
            {
                //获得节点子元素
                XElement eleAmazonDetailUrl = config.Element("AmazonDetailUrl");
                XElement eleAmazonListUrl = config.Element("AmazonListUrl");
                XElement eleHz = config.Element("Hz");
                XElement eleCount = config.Element("Count");
                //在页面上呈现取到的数据
                if (eleAmazonDetailUrl != null)
                    TextBox_AmazonDetailUrl.Text = eleAmazonDetailUrl.Value;
                if (eleAmazonListUrl != null)
                    TextBox_AmazonListUrl.Text = eleAmazonListUrl.Value;
                if (eleHz != null)
                    TextBox_Hz.Text = eleHz.Value;
                if (eleCount != null)
                    TextBox_Count.Text = eleCount.Value;
            }
            else
                Response.Write("");

        }
    }
    protected void btn_Save_Click(object sender, EventArgs e)
    {
        //设置XML文件路径
        string path = Request.PhysicalApplicationPath + xmlPath;
        //设置节点的名称和内容
        XElement root = new XElement("Settings",
             new XElement("AmazonDetailUrl", TextBox_AmazonDetailUrl.Text.Trim()),
             new XElement("AmazonListUrl", TextBox_AmazonListUrl.Text.Trim()),
             new XElement("Hz", TextBox_Hz.Text.Trim()),
             new XElement("Count", TextBox_Count.Text.Trim())
                 );
        //将元素序列化到指定路径的XML文件当中
        root.Save(path);
     }