本文整理汇总了C#中System.Xml.XPath.XPathNavigator.Evaluate方法的典型用法代码示例。如果您正苦于以下问题：C# XPathNavigator.Evaluate方法的具体用法？C# XPathNavigator.Evaluate怎么用？C# XPathNavigator.Evaluate使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。
在下文中一共展示了XPathNavigator.Evaluate方法的5个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: XPathDocument
XPathDocument document = new XPathDocument("books.xml");
XPathNavigator navigator = document.CreateNavigator();
Double total = (double)navigator.Evaluate("sum(descendant::book/price)");
Console.WriteLine("Total price for all books: {0}", total.ToString());示例2: XPathDocument
XPathDocument document = new XPathDocument("books.xml");
XPathNavigator navigator = document.CreateNavigator();
XPathExpression query = navigator.Compile("sum(descendant::book/price)");
Double total = (double)navigator.Evaluate(query);
Console.WriteLine("Total price for all books: {0}", total.ToString());示例3: XPathDocument
XPathDocument document = new XPathDocument("contosoBooks.xml");
XPathNavigator navigator = document.CreateNavigator();
XmlNamespaceManager manager = new XmlNamespaceManager(navigator.NameTable);
manager.AddNamespace("bk", "http://www.contoso.com/books");
Double total = (double)navigator.Evaluate("sum(descendant::bk:book/bk:price)", manager);
Console.WriteLine("Total price for all books: {0}", total.ToString());示例4: XPathDocument
XPathDocument document = new XPathDocument("books.xml");
XPathNavigator navigator = document.CreateNavigator();
XPathNodeIterator nodes = navigator.Select("//book");
XPathExpression query = nodes.Current.Compile("sum(descendant::price)");
Double total = (double)navigator.Evaluate(query, nodes);
Console.WriteLine("Total price for all books: {0}", total.ToString());示例5: Main
//引入命名空间
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.XPath;
public class MainClass {
public static void Main() {
XPathDocument doc = new XPathDocument("books.xml");
XPathNavigator nav = ((IXPathNavigable)doc).CreateNavigator();
XPathNodeIterator iter = nav.Select("/bookstore/book");
while (iter.MoveNext()) {
XPathNodeIterator newIter = iter.Current.SelectDescendants(XPathNodeType.Element, false);
while (newIter.MoveNext())
Console.WriteLine(newIter.Current.Name + ": " + newIter.Current.Value);
}
Console.WriteLine("Total Cost = " + nav.Evaluate("sum(/bookstore/book/price)"));
}
}