XPathNavigator类包含移动和选择XML所需元素的所有方法。
XPathDocument doc = new XPathDocument("./books.xml"); XPathNavigator nav = ((IXPathNavigable)doc).CreateNavigator();
XmlDocument doc = new XmlDocument(); doc.Load("./books.xml"); XPathNavigator nav2 = doc.CreateNavigator();
//查询bookstore的子元素book中genre属性值为novel的所有节点 XPathNodeIterator iter = nav.Select("/bookstore/book[@genre=‘novel‘]"); while (iter.MoveNext()) { //迭代所有子代节点 XPathNodeIterator newIter = iter.Current.SelectDescendants(XPathNodeType.Element, false); while (newIter.MoveNext()) { Console.WriteLine(newIter.Current.Name + " : " + newIter.Current.Value); } }
使用Evaluate()方法计算表达式的值；
//统计图书总价 Console.WriteLine("Total price = {0}", nav.Evaluate("sum(bookstore/book/price)"));
插入节点：先检查CanEdit属性是否为true，再使用InsertAfter()方法插入新节点。
XmlDocument doc = new XmlDocument(); doc.Load("./books.xml"); XPathNavigator nav2 = doc.CreateNavigator(); //判断是否可编辑 if (nav2.CanEdit) { XPathNodeIterator iter = nav2.Select("bookstore/book/price"); while (iter.MoveNext()) { //在当前节点之后插入新节点 iter.Current.InsertAfter("<disc>5</disc>"); } } doc.Save("./newBooks.xml");
通过XPathNavigator转换为XmlReader ，XmlWriter读写数据
//读： XmlReader reader=nav.ReadSubtree(); while(reader.Read()) {
Console.Write(reader.ReadOuterXml());} //写： XmlWriter writer=XmlWriter.Create("./1.xml"); nav.WriteSubtree(writer); writer.Close();
C#（2）：Xpath导航器XpathNavigator 、System.Xml.XPath
原文：https://www.cnblogs.com/springsnow/p/12883391.html