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
// 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 );
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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
//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
//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" );
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3.如何写CData
xmlWriter.WriteStartElement( "dog" );
//写CData xmlWriter.WriteCData( "<strong>dog is dog</strong>" );
xmlWriter.WriteEndElement(); |
4.如何使用XmlWriter添加注释
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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
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:
/*玉开技术博客 http://www.cnblogs.com/yukaizhao */ 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.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();
}
}
} |