.NET中XML的常用操作_转摘

1 系统类的介绍

1.1 XmlDocument (DOM)

将Xml整个读入内存中，操作方便，不适宜读取大文本。

命名空间: System.Xml

1.2 XmlReader (SAX)

不加载文本到内存，直接读取文本，内存占用低，可以快速读取文件中的指定节点。

命名空间: System.Xml

1.3 XmlSchema

Xml架构，用于验证Xml文本的有效性。

命名空间: System.Xml.Schema

2 典型应用示例

2.1 XmlDocument

// 新建一个XmlDocument对象

XmlDocument oXmlDocument = new XmlDocument();

// oXmlDocument.Load(filename); // 读取整个文件

// 添加 XML 文件声明

XmlDeclaration xmlDeclaration = oXmlDocument.CreateXmlDeclaration(XmlVersion, XmlEncoding, null);

oXmlDocument.AppendChild(xmlDeclaration);

// 添加 POWER_EXCHANGE 根节点

XmlElement root = oXmlDocument.CreateElement("POWER_EXCHANGE");

root.SetAttribute("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");

root.SetAttribute("xsi:noNamespaceSchemaLocation", "exchange.xsd");

oXmlDocument.AppendChild(root);

2.2 XmlReader

//从文件读取
XmlReader read = XmlReader.Create(filename);

read.ReadToFollowing("OBJECT");

string sName = xread.GetAttribute("NAME");

string sVerb = xread.GetAttribute("VERB");

//从Xml字符串读取
StringReader sReader = new StringReader(sXml);

XmlReader xmlReader = XmlReader.Create(sReader);

read.ReadToFollowing("OBJECT");

string sName = xread.GetAttribute("NAME");

string sVerb = xread.GetAttribute("VERB");

2.3 XmlSchema

// Create a schema validating XmlReader.

XmlReaderSettings settings = new XmlReaderSettings();

settings.Schemas.Add(targetNamespace, xsdFile);

settings.ValidationEventHandler += new ValidationEventHandler(ValidationEventHandler);

settings.ValidationFlags = settings.ValidationFlags | XmlSchemaValidationFlags.ReportValidationWarnings;

settings.ValidationType = ValidationType.Schema;

XmlReader reader = XmlReader.Create(xmlFile, settings);

// The XmlDocument validates the XML document contained

// in the XmlReader as it is loaded into the DOM.

XmlDocument document = new XmlDocument();

document.Load(reader);