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XmlDocument doc = new XmlDocument();
doc.Load(@"e:\xPath.xml");
XmlNode node = doc.SelectSingleNode("/slider/item[@href='http://www.lanrentuku.com/']");
XmlElement element = (XmlElement)node;
element.SetAttribute("href", "http://www.abc.com/");
element.SetAttribute("title", "title");
element.SetAttribute("cont", "cont");
doc.Save(@"e:\xPath.xml");
<?xml version="1.0" encoding="GBK"?>
<slider>
<item href="http://www.abc.com/" title="title" imageurl="images/01.jpg" cont="cont" />
<item href="http://www.lanrentuku.com/" title="All about ladies" imageurl="images/02.jpg" cont="多年收集的fashion foto shots一次奉上!" />
<item href="http://www.lanrentuku.com/" title="11月模特私服街拍精选 超清晰!" imageurl="images/03.jpg" cont="看模特街拍绝对是种美的享受!" />
<item href="http://www.lanrentuku.com/" title="足下妖娆:2009年T台美鞋时刻" imageurl="images/04.jpg" cont="懒人图库 爱美的女人一定爱鞋!" />
</slider>
XmlDocument doc = new XmlDocument();
doc.Load(@"e:\xPath.xml");
XmlNode node = doc.SelectSingleNode("/slider/item[@href='http://www.lanrentuku.com/']");
XmlElement element = (XmlElement)node;
element.SetAttribute("href", "http://www.abc.com/");
doc.Save(@"e:\Path.xml");