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)
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.XPathNodeIteratorAn XPathNodeIterator that points to the selected node set.
| Exception | Condition |
|---|---|
| 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>
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
