XPathNavigator.Select Method (String, IXmlNamespaceResolver)

Selects a node set using the specified XPath expression with the IXmlNamespaceResolver object specified to resolve namespace prefixes.

Namespace:  System.Xml.XPath
Assembly:  System.Xml (in System.Xml.dll)

public virtual XPathNodeIterator Select(
	string xpath,
	IXmlNamespaceResolver resolver
)

Parameters

xpath
Type: System.String

A String representing an XPath expression.

resolver
Type: System.Xml.IXmlNamespaceResolver

The IXmlNamespaceResolver object used to resolve namespace prefixes.

Return Value

Type: System.Xml.XPath.XPathNodeIterator
An XPathNodeIterator that points to the selected node set.

ExceptionCondition
ArgumentException

The XPath expression contains an error or its return type is not a node set.

XPathException

The XPath expression is not valid.

The following example illustrates selecting a node set using the Select method with the XmlNamespaceManager object specified to resolve namespace prefixes in the XPath expression.

XPathDocument document = new XPathDocument("contosoBooks.xml");
XPathNavigator navigator = document.CreateNavigator();
XmlNamespaceManager manager = new XmlNamespaceManager(navigator.NameTable);
manager.AddNamespace("bk", "http://www.contoso.com/books");

XPathNodeIterator nodes = navigator.Select("/bk:bookstore/bk:book/bk:price", manager);
// Move to the first node bk:price node 
if(nodes.MoveNext())
{
    // now nodes.Current points to the first selected node
    XPathNavigator nodesNavigator = nodes.Current;

    //select all the descendants of the current price node
    XPathNodeIterator nodesText = 
       nodesNavigator.SelectDescendants(XPathNodeType.Text, false);

    while(nodesText.MoveNext())
    {
       Console.WriteLine(nodesText.Current.Value);
    }
}

The example takes the contosoBooks.xml file as an input.

<?xml version="1.0" encoding="utf-8" ?>
<bookstore xmlns="http://www.contoso.com/books">
    <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">
        <title>The Autobiography of Benjamin Franklin</title>
        <author>
            <first-name>Benjamin</first-name>
            <last-name>Franklin</last-name>
        </author>
        <price>8.99</price>
    </book>
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">
        <title>The Confidence Man</title>
        <author>
            <first-name>Herman</first-name>
            <last-name>Melville</last-name>
        </author>
        <price>11.99</price>
    </book>
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">
        <title>The Gorgias</title>
        <author>
            <name>Plato</name>
        </author>
        <price>9.99</price>
    </book>
</bookstore>

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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