XmlNodeList nodeList=xmlDoc.SelectSingleNode("bookstore").ChildNodes;//獲取bookstore節(jié)點(diǎn)的所有子節(jié)點(diǎn)
foreach(XmlNode xn in nodeList)//遍歷所有子節(jié)點(diǎn)
{
XmlElement xe=(XmlElement)xn;//將子節(jié)點(diǎn)類型轉(zhuǎn)換為XmlElement類型
if(xe.GetAttribute("genre")=="李贊紅")//如果genre屬性值為“李贊紅”
{
xe.SetAttribute("genre","update李贊紅");//則修改該屬性為“update李贊紅”

XmlNodeList nls=xe.ChildNodes;//繼續(xù)獲取xe子節(jié)點(diǎn)的所有子節(jié)點(diǎn)
foreach(XmlNode xn1 in nls)//遍歷
{
XmlElement xe2=(XmlElement)xn1;//轉(zhuǎn)換類型
if(xe2.Name=="author")//如果找到
{
xe2.InnerText="亞勝";//則修改
break;//找到退出來就可以了
}
}
break;
}
}

xmlDoc.Save("bookstore.xml");//保存。
//==================================================
最后結(jié)果為：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="fantasy" ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
<book genre="update李贊紅" ISBN="2-3631-4">
<title>CS從入門到精通</title>
<author>亞勝</author>
<price>58.3</price>
</book>
</bookstore>

foreach(XmlNode xn in xnl)
{
XmlElement xe=(XmlElement)xn;
if(xe.GetAttribute("genre")=="fantasy")
{
xe.RemoveAttribute("genre");//刪除genre屬性
}
else if(xe.GetAttribute("genre")=="update李贊紅")
{
xe.RemoveAll();//刪除該節(jié)點(diǎn)的全部?jī)?nèi)容
}
}
xmlDoc.Save("bookstore.xml");
//===========================================
最后結(jié)果為：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
<book>
</book>
</bookstore>

XmlNodeList xnl=xn.ChildNodes;

foreach(XmlNode xnf in xnl)
{
XmlElement xe=(XmlElement)xnf;
Console.WriteLine(xe.GetAttribute("genre"));//顯示屬性值
Console.WriteLine(xe.GetAttribute("ISBN"));

XmlNodeList xnf1=xe.ChildNodes;
foreach(XmlNode xn2 in xnf1)
{
Console.WriteLine(xn2.InnerText);//顯示子節(jié)點(diǎn)點(diǎn)文本
}
}