Find Elements with an XPath Search - CSharp XML

CSharp examples for XML:XPath

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Introduction

XPath Expression Syntax

Expression
 Description
 Example
/


 Starts an absolute path /Order/Items/Item selects all Item elements that are children
that selects from the root of an Items element, which is itself a child of the root Order
node. element.
//


 Starts a relative path that
selects nodes anywhere.

 //Item/Name selects all the Name elements that are children of
an Item element, regardless of where they appear in the
document.
@

 Selects an attribute of a
node.
/Order/@id selects the attribute named id from the root
Order element.
*

 Selects any element in the
path.
/Order/* selects both Items and Client nodes because both
are contained by a root Order element.
|


 Combines multiple paths.


 /Order/Items/Item/Name|Order/Client/Name selects the Name
nodes used to describe a Client and the Name nodes used to
describe an Item.
.

 Indicates the current
(default) node.
If the current node is an Order, the expression ./Items refers
to the related items for that order.
..

 Indicates the parent node.

 //Name/.. selects any element that is parent to a Name, which
includes the Client and Item elements.
[ ]





 Defines selection criteria
that can test a contained
node or an attribute value.



 /Order[@id="2020-01-30.195496"] selects the Order
elements with the indicated attribute value.
/Order/Items/Item[Price > 50] selects products higher
than $50 in price.
/Order/Items/Item[Price > 50 and Name="Laser Printer"]
selects products that match two criteria.
starts-
with

Retrieves elements based
on what text a contained
element starts with.
/Order/Items/Item[starts-with(Name, "C")] finds all Item
elements that have a Name element that starts with the letter
C.
position

 Retrieves elements based
on position.
/Order/Items/Item[position ()=2] selects the second Item
element.
count




 Counts elements. You
specify the name of the
child element to count or
an asterisk (*) for all
children.
/Order/Items/Item[count(Price) = 1] retrieves Item
elements that have exactly one nested Price element.



Demo Code


using System;//from   w w  w  .j  a  va  2 s .com
using System.Xml;

public class XPathSelectNodes
{
    [STAThread]
    private static void Main()
    {
        // Load the document.
        XmlDocument doc = new XmlDocument();
        doc.Load("orders.xml");

        XmlNodeList nodes = doc.SelectNodes("/Order/Items/Item/Name");

        foreach (XmlNode node in nodes)
        {
            Console.WriteLine(node.InnerText);
        }

        Console.ReadLine();
    }
}

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