XML样例：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="李1" ISBN="2-3645-4">
<title>Net从入门到精通</title>
<author>李大蒜</author>
<price>58.3</price>
</book>
<book genre="李2" ISBN="2-3631-4">
<title>CS从入门到精通</title>
<author>候捷</author>
<price>58.3</price>
</book>
<book genre="李3" ISBN="2-3631-4">
<title>CS从入门到精通</title>
<author>候捷</author>
<price>58.3</price>
</book>
</bookstore>
执行代码一：
/// <summary>
/// 删除属性值等于“AttributeValue”的节点
/// </summary>
/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
/// <param name="xmlAttributeName">要删除包含xmlAttributeName属性的节点的名称</param>
/// <param name="AttributeValue"></param>
private void XmlNodeByXPath(string xmlFileName, string xpath, string xmlAttributeName, string AttributeValue)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(xmlFileName);
XmlNodeList xNodes = xmlDoc.SelectSingleNode(xpath).ChildNodes;
for (int i = xNodes.Count - 1; i >= 0; i--)
{
XmlElement xe = (XmlElement)xNodes[i];
if (xe.GetAttribute(xmlAttributeName) == AttributeValue)
{
xNodes[i].ParentNode.RemoveChild(xNodes[i]);
}
}
xmlDoc.Save(xmlFileName);
}
实验：XmlNodeByXPath("E:\\bookstore.xml", "bookstore", "genre", "李3");
结果：
<?xml version="1.0" encoding="gb2312"?>
<bookstore>
<book genre="李1" ISBN="2-3645-4">
<title>Net从入门到精通</title>
<author>李大蒜</author>
<price>58.3</price>
</book>
<book genre="李2" ISBN="2-3631-4">
<title>CS从入门到精通</title>
<author>候捷</author>
<price>58.3</price>
</book>
</bookstore>
小注：
1、删除节点不能使用foreach，使用的话会造成删除XML一个节点，就跳出循环，也不报错，很隐蔽的错误。
2、该函数也可以这么实现
/// <summary>
/// 删除属性值等于“AttributeValue”的节点
/// </summary>
/// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param>
/// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param>
/// <param name="xmlAttributeName">要删除包含xmlAttributeName属性的节点的名称</param>
/// <param name="AttributeValue"></param>
private void XmlNodeByXPath(string xmlFileName, string xpath, string xmlAttributeName, string AttributeValue)
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(xmlFileName);
XmlNode root = xmlDoc.SelectSingleNode(xpath);
XmlNodeList xnl = xmlDoc.SelectSingleNode(xpath).ChildNodes;
for (int i = 0; i < xnl.Count; i++)
{
XmlElement xe = (XmlElement)xnl.Item(i);
if (xe.GetAttribute(xmlAttributeName) == AttributeValue)
{
root.RemoveChild(xe);
if (i < xnl.Count) i = i - 1;
}
}
xmlDoc.Save(xmlFileName);
}
