.NET创建XML文件

 创建一个WebSite网站，在CS文件中写入代码，如下：

using System;using System.Configuration;using System.Data;using System.Linq;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.HtmlControls;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Xml.Linq;using System.Xml;public partial class _Default : System.Web.UI.Page {    protected void Page_Load(object sender, EventArgs e)    {    }    protected XmlDocument doc;    protected void button_OnClick(object sender, EventArgs e)    {        doc = new XmlDocument();        //加入XML的声明段落，<?xml version="1.0" encoding="GB2312"?>        XmlDeclaration dec = doc.CreateXmlDeclaration("1.0","GB2312",null);        //添加新节点到末尾        doc.AppendChild(dec);//AppendChild方法为XmlNode的方法        //加入一个根元素        XmlElement ele = doc.CreateElement("html1");        doc.AppendChild(ele);        //加入另外一个元素        for (int i = 0; i < 3; i++)        {            //查找<Employees>节点            XmlNode root = doc.SelectSingleNode("html1");            XmlElement ele1 = doc.CreateElement("body1");            ele1.SetAttribute("id","body1");            XmlElement ele1_1 = doc.CreateElement("div");            ele1_1.InnerText = "你好！";            ele1.AppendChild(ele1_1);            XmlElement ele1_2 = doc.CreateElement("div");            ele1_2.InnerText = "加油！";            ele1.AppendChild(ele1_2);            root.AppendChild(ele1);        }        doc.Save(Server.MapPath("data.xml"));        string content = System.IO.File.ReadAllText(Server.MapPath("data.xml"));        Response.Write(content);    }    }

注：XmlDocument类中的方法CreateXmlDeclaration返回XmlDeclaration（创建一个新的XmlDeclaration对象）

public virtual XmlDeclaration CreateXmlDeclaration(string version, string encoding, string standalone){    return new XmlDeclaration(version, encoding, standalone, this);}

以上为第一种创建XML方式，同时可以用System.xml.xmlWriter类来创建

WriteStartDocument  当在派生类中被重写时，编写版本为“1.0”的 XML 声明。 

WriteCData  当在派生类中被重写时，写出包含指定文本的 <![CDATA[...]]> 块。

WriteStartElement(String)  当在派生类中被重写时，写出具有指定的本地名称的开始标记。

WriteEndElement  当在派生类中被重写时，关闭一个元素并弹出相应的命名空间范围。

WriteEndDocument  当在派生类中被重写时，关闭任何打开的元素或特性并将编写器重新设置为 Start 状态。

WriteEndAttribute  当在派生类中被重写时，关闭上一个 WriteStartAttribute 调用。  

WriteAttributeString(String, String)  当在派生类中被重写时，写出具有指定的本地名称和值的特性。

下面为运用部分（MSDN文档）

using System;using System.IO;using System.Xml;public class Sample {  private const string filename = "sampledata.xml";  public static void Main() {     XmlWriterSettings settings = new XmlWriterSettings();     settings.Indent = true;     XmlWriter writer = XmlWriter.Create(filename, settings);     // Write the Processing Instruction node.     String PItext="type=\"text/xsl\" href=\"book.xsl\"";writer.WriteProcessingInstruction("xml-stylesheet", PItext);     // Write the DocumentType node.     writer.WriteDocType("book", null , null, "<!ENTITY h \"hardcover\">");     // Write a Comment node.     writer.WriteComment("sample XML");     // Write the root element.     writer.WriteStartElement("book");     // Write the genre attribute.     writer.WriteAttributeString("genre", "novel");     // Write the ISBN attribute.     writer.WriteAttributeString("ISBN", "1-8630-014");     // Write the title.     writer.WriteElementString("title", "The Handmaid's Tale");     // Write the style element.     writer.WriteStartElement("style");     writer.WriteEntityRef("h");     writer.WriteEndElement();      // Write the price.     writer.WriteElementString("price", "19.95");     // Write CDATA.     writer.WriteCData("Prices 15% off!!");     // Write the close tag for the root element.     writer.WriteEndElement();     writer.WriteEndDocument();     // Write the XML to file and close the writer.     writer.Flush();     writer.Close();    }}