C#教程之基于C#中XmlWriter写入Xml的深入分析

当前位置:

首页 > c#编程 >

C#教程之基于C#中XmlWriter写入Xml的深入分析

假定创建了XmlWriter的实例变量xmlWriter，下文中将使用此实例变量写Xml
1.如何使用XmlWriter写Xml文档声明

复制代码代码如下:

	
	// WriteStartDocument方法可以接受一个bool参数（表示standalone，是否为独立文档）或者不指定参数standalone保持默认值

	xmlWriter.WriteStartDocument(false|true);

注意在使用WriteStartDocument方法后最好调用xmlWrite.WriteEndDocument()方法来关闭所有可能未关闭标签
2.如何使用XmlWriter写xml节点以及属性

复制代码代码如下:

	
	//写节点

	xmlWriter.WriteStartElement("cat");

	//给节点添加属性

	xmlWriter.WriteAttributeString("color", "white");

	//给节点内部添加文本

	xmlWriter.WriteString("I'm a cat");

	xmlWriter.WriteEndElement();

或者通过WriteElementString(string,string)方法写xml节点同时写下节点值，如下

复制代码代码如下:

	
	//通过WriteElementString可以添加一个节点同时添加节点内容

	xmlWriter.WriteElementString("pig", "pig is great");

3.如何写CData

复制代码代码如下:

	
	xmlWriter.WriteStartElement("dog");

	//写CData

	xmlWriter.WriteCData("<strong>dog is dog</strong>");

	xmlWriter.WriteEndElement();

4.如何使用XmlWriter添加注释

复制代码代码如下:

xmlWriter.WriteComment("this is an example writed by http://www.jb51.net ");

5.如何设置XmlWriter的输出格式，解决输出UTF-16问题
设置xml输出格式，需要通过XmlWriterSettings类，如下代码

复制代码代码如下:

	
	XmlWriterSettings settings = new XmlWriterSettings();

	//要求缩进

	settings.Indent = true;

	//注意如果不设置encoding默认将输出utf-16

	//注意这儿不能直接用Encoding.UTF8如果用Encoding.UTF8将在输出文本的最前面添加4个字节的非xml内容

	settings.Encoding = new UTF8Encoding(false);

	//设置换行符

	settings.NewLineChars = Environment.NewLine;

完整的代码示例如下：

复制代码代码如下:

	
	using System;

	using System.Collections.Generic;

	using System.Text;

	using System.IO;

	using System.Xml;

	namespace UseXmlWriter

	{

	    class Program

	    {

	        static void Main(string[] args)

	        {

	            using (MemoryStream ms = new MemoryStream())

	            {

	                XmlWriterSettings settings = new XmlWriterSettings();

	                //要求缩进

	                settings.Indent = true;

	                //注意如果不设置encoding默认将输出utf-16

	                //注意这儿不能直接用Encoding.UTF8如果用Encoding.UTF8将在输出文本的最前面添加4个字节的非xml内容

	                settings.Encoding = new UTF8Encoding(false);

	                //设置换行符

	                settings.NewLineChars = Environment.NewLine;

	                using (XmlWriter xmlWriter = XmlWriter.Create(ms, settings))

	                {

	                    //写xml文件开始<?xml version="1.0" encoding="utf-8" ?>

	                    xmlWriter.WriteStartDocument(false);

	                    //写根节点

	                    xmlWriter.WriteStartElement("root");

	                    //写字节点

	                    xmlWriter.WriteStartElement("cat");

	                    //给节点添加属性

	                    xmlWriter.WriteAttributeString("color", "white");

	                    //给节点内部添加文本

	                    xmlWriter.WriteString("I'm a cat");

	                    xmlWriter.WriteEndElement();

	                    //通过WriteElementString可以添加一个节点同时添加节点内容

	                    xmlWriter.WriteElementString("pig", "pig is great");

	                    xmlWriter.WriteStartElement("dog");

	                    //写CData

	                    xmlWriter.WriteCData("<strong>dog is dog</strong>");

	                    xmlWriter.WriteEndElement();

	                    xmlWriter.WriteComment("this is an example writed by  http://www.jb51.net ");

	                    xmlWriter.WriteEndElement();

	                    xmlWriter.WriteEndDocument();

	                }

	                //将xml内容输出到控制台中

	                string xml = Encoding.UTF8.GetString(ms.ToArray());

	                Console.WriteLine(xml);

	            }

	            Console.Read();

	        }

	    }

	}

栏目列表