// ReadXml.cs
// XmlReader示例

using System;
using System.Xml;

class Test
{
  public static void Main(string[] args)
  {
    string path = @"G:\资料\C#面向对象编程\C#面向对象编程\CSharp\Chapter17\books.xml";
    XmlReader reader = null;
    try
    {
      // 创建XmlReaderSettings对象
      XmlReaderSettings settings = new XmlReaderSettings();
      // 设置XmlReaderSettings对象的属性
      settings.ProhibitDtd = false;
      // 使用XmlReaderSettings对象来创建XmlReader对象
      reader = XmlReader.Create(path, settings);
      ReadXml(reader);
      reader.Close();
      Console.ReadKey();
    }
    catch (Exception ex)
    {
      Console.WriteLine(ex.Message);
    }
    finally
    {
      if (reader != null)
        reader.Close();
    }
  }

  private static void ReadXml(XmlReader reader)
  {
    try
    {
      // 解析文件，并显示每一个节点
      while (reader.Read())
      {
        switch (reader.NodeType)
        {
          case XmlNodeType.Element:
            if (reader.IsEmptyElement) // 空元素？
            {
              Console.WriteLine("<{0}/>", reader.Name);
            }
            else
            {
              Console.Write("<{0}", reader.Name);
              if (reader.HasAttributes)  // 属性？
              {
                while (reader.MoveToNextAttribute())
                {
                  Console.Write(" {0}=\"{1}\"", reader.Name, reader.Value);
                }
              }
              Console.WriteLine(">", reader.Name);
            }
            break;
          case XmlNodeType.Text:
            Console.WriteLine(reader.Value);
            break;
          case XmlNodeType.CDATA:
            Console.WriteLine("<![CDATA[{0}]]>", reader.Value);
            break;
          case XmlNodeType.ProcessingInstruction:
            Console.WriteLine("<?{0} {1}?>", reader.Name, reader.Value);
            break;
          case XmlNodeType.Comment:
            Console.WriteLine("<!--{0}-->", reader.Value);
            break;
          case XmlNodeType.XmlDeclaration:
            Console.WriteLine("<?xml version='1.0'?>");
            break;
          case XmlNodeType.Document:
            break;
          case XmlNodeType.DocumentType:
            Console.WriteLine("<!DOCTYPE {0} [{1}]>", reader.Name, reader.Value);
            break;
          case XmlNodeType.EntityReference:
            Console.WriteLine(reader.Name);
            break;
          case XmlNodeType.EndElement:
            Console.WriteLine("</{0}>", reader.Name);
            break;
        }
      }
    }
    catch (XmlException ex)
    {
      Console.WriteLine(ex.Message);
    }
  }
}

XMLWriter
using System.Xml;

namespace ConsoleApplication1
{
  class Program
  {
    static void Main(string[] args)
    {
      string path=@"C:\Users\dell\Desktop\test.xml";
      XmlWriter writer=null;
      XmlWriterSettings settings = new XmlWriterSettings();
      settings.Indent = true;
      settings.IndentChars=("");
      writer = XmlWriter.Create(path, settings);
      WriteXml(writer);
      writer.Close();
    }
    private static void WriteXml(XmlWriter writer)
    {
      writer.WriteStartElement("books");
      WriteChildNode(writer, "红楼梦", "曹雪芹", "25");
      WriteChildNode(writer, "三国演义", "罗贯中", "20");
      WriteChildNode(writer, "水浒传", "施耐庵", "18");
      WriteChildNode(writer, "聊斋志异", "蒲松龄", "16");
      writer.WriteEndElement();
    }
    private static void WriteChildNode(XmlWriter writer, string title, string author, string price)
    {
      writer.WriteStartElement("book");

      writer.WriteStartElement("title");
      writer.WriteValue(title);
      writer.WriteEndElement();

      writer.WriteStartElement("author");
      writer.WriteValue(author);
      writer.WriteEndElement();
      
      writer.WriteStartElement("price");
      writer.WriteValue(price);
      writer.WriteEndElement();

      writer.WriteEndElement();
    }
  }
}