XPath Iterator

The XPathIterator class in the Windows API provides a mechanism for iterating over a set of nodes that match a given XPath expression.

Class Overview

This class is part of the System.Xml.XPath namespace and allows you to traverse through the nodes of an XML document that are selected by an XPath query. It implements the IEnumerator interface, providing standard iteration capabilities.

Methods

Method Name	Description
`MoveNext()`	Advances the enumerator to the next node in the collection. Returns `true` if the enumerator was successfully advanced to the next node; returns `false` if the end of the collection has been reached.
`Reset()`	Sets the enumerator to its initial position, which is before the first node in the collection.
`Current`	Gets the current node in the iteration. This property returns a node of type `XmlNode` or a similar XML node representation.

Example Usage

The following C# code snippet demonstrates how to use an XPathIterator to loop through all elements named "book" in an XML document:


using System;
using System.Xml;
using System.Xml.XPath;

// Assume 'xmlDoc' is an XmlDocument object loaded with your XML data.
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(@"

    
        Gambardella, Matthew
        XML Developer's Guide
        Computer
        44.95
        2000-10-01
        An in-depth look at creating applications with XML.
    
    
        Ralls, Kim
        Midnight Rain
        Fantasy
        5.95
        2000-12-16
        A former architect battles corporate zombies, an evil sorceress, and her own childhood to become queen of the world.
    

");

// Create an XPath navigator
XPathNavigator navigator = xmlDoc.CreateNavigator();

// Select the nodes using XPath
XPathNodeIterator iterator = navigator.Select("catalog/book");

Console.WriteLine("List of Books:");
while (iterator.MoveNext())
{
    // Get the current node and extract its title
    XPathNavigator currentNode = iterator.Current;
    string title = currentNode.SelectSingleNode("title").Value;
    Console.WriteLine($"- {title}");
}

XPath Iterator

Class Overview

Methods

Example Usage

Related Topics