本文整理汇总了VB.NET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：VB.NET XPathNavigator.Evaluate方法的具体用法？VB.NET XPathNavigator.Evaluate怎么用？VB.NET 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4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VB.NET代码示例。
示例1: XPathDocument
Dim document As XPathDocument = New XPathDocument("books.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()
Dim total As Double = CType(navigator.Evaluate("sum(descendant::book/price)"), Double)
Console.WriteLine("Total price for all books: {0}", total.ToString())示例2: XPathDocument
Dim document As XPathDocument = New XPathDocument("books.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()
Dim query As XPathExpression = navigator.Compile("sum(descendant::book/price)")
Dim total As Double = CType(navigator.Evaluate(query), Double)
Console.WriteLine("Total price for all books: {0}", total.ToString())示例3: XPathDocument
Dim document As XPathDocument = New XPathDocument("contosoBooks.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()
Dim manager As XmlNamespaceManager = New XmlNamespaceManager(navigator.NameTable)
manager.AddNamespace("bk", "http://www.contoso.com/books")
Dim total As Double = CType(navigator.Evaluate("sum(descendant::bk:book/bk:price)", manager), Double)
Console.WriteLine("Total price for all books: {0}", total.ToString())示例4: XPathDocument
Dim document As XPathDocument = New XPathDocument("books.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()
Dim nodes As XPathNodeIterator = navigator.Select("//book")
Dim query As XPathExpression = nodes.Current.Compile("sum(descendant::price)")
Dim total As Double = CType(navigator.Evaluate(query, nodes), Double)
Console.WriteLine("Total price for all books: {0}", total.ToString())