ajax的xmlHttpRequest对象(3)_H5之家 - 中国HTML5教程资源分享第一站

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Xml.XPath; using System.Xml; namespace UseXPathDotNet { class Program { static void Main(string[] args) { UseXPathWithXPathDocument(); UseXPathWithXmlDocument(); Console.Read(); } static void UseXPathWithXmlDocument() { XmlDocument doc = new XmlDocument(); doc.Load(""); //使用xPath选择需要的节点 XmlNodeList nodes = doc.SelectNodes("/rss/channel/item[position()<=10]"); foreach (XmlNode item in nodes) { string title = item.SelectSingleNode("title").InnerText; string url = item.SelectSingleNode("link").InnerText; Console.WriteLine("{0} = {1}", title, url); } } static void UseXPathWithXPathDocument() { XPathDocument doc = new XPathDocument(""); XPathNavigator xPathNav = doc.CreateNavigator(); //使用xPath取rss中最新的10条随笔 XPathNodeIterator nodeIterator = xPathNav.Select("/rss/channel/item[position()<=10]"); while (nodeIterator.MoveNext()) { XPathNavigator itemNav = nodeIterator.Current; string title = itemNav.SelectSingleNode("title").Value; string url = itemNav.SelectSingleNode("link").Value; Console.WriteLine("{0} = {1}",title,url); } } } }

XPath使用示例，请看下面的代码注释　

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Xml; namespace UseXPath1 { class Program { static void Main(string[] args) { string xml = @"<?xml version=""1.0"" encoding=""utf-8"" ?> <pets> <cat color=""black"" weight=""10"" count=""4""> <price>100</price> <desc>this is a black cat</desc> </cat> <cat color=""white"" weight=""9"" count=""5""> <price>80</price> <desc>this is a white cat</desc> </cat> <cat color=""yellow"" weight=""15"" count=""1""> <price>110</price> <desc>this is a yellow cat</desc> </cat> <dog color=""black"" weight=""10"" count=""7""> <price>114</price> <desc>this is a black dog</desc> </dog> <dog color=""white"" weight=""9"" count=""4""> <price>80</price> <desc>this is a white dog</desc> </dog> <dog color=""yellow"" weight=""15"" count=""15""> <price>80</price> <desc>this is a yellow dog</desc> </dog> <pig color=""white"" weight=""100"" count=""2""> <price>8000</price> <desc>this is a white pig</desc> </pig> </pets>"; using (StringReader rdr = new StringReader(xml)) { XmlDocument doc = new XmlDocument(); doc.Load(rdr); //取所有pets节点下的dog字节点 XmlNodeList nodeListAllDog = doc.SelectNodes("/pets/dog"); //所有的price节点 XmlNodeList allPriceNodes = doc.SelectNodes("//price"); //取最后一个price节点 XmlNode lastPriceNode = doc.SelectSingleNode("//price[last()]"); //用双点号取price节点的父节点 XmlNode lastPriceParentNode = lastPriceNode.SelectSingleNode(".."); //选择weight*count=40的所有动物，使用通配符* XmlNodeList nodeList = doc.SelectNodes("/pets/*[@weight*@count=40]"); //选择除了pig之外的所有动物,使用name()函数返回节点名字 XmlNodeList animalsExceptPigNodes = doc.SelectNodes("/pets/*[name() != 'pig']"); //选择价格大于100而不是pig的动物 XmlNodeList priceGreaterThan100s = doc.SelectNodes("/pets/*[price p @weight >10 and name() != 'pig']"); foreach (XmlNode item in priceGreaterThan100s) { Console.WriteLine(item.OuterXml); } //选择第二个dog节点 XmlNode theSecondDogNode = doc.SelectSingleNode("//dog[position() = 2]"); //使用xpath ，axes 的 parent 取父节点 XmlNode parentNode = theSecondDogNode.SelectSingleNode("parent::*"); //使用xPath选择第二个dog节点前面的所有dog节点 XmlNodeList dogPresibling = theSecondDogNode.SelectNodes("preceding::dog"); //取文档的所有子孙节点price XmlNodeList childrenNodes = doc.SelectNodes("descendant::price"); } Console.Read(); } } }

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