Extensions.XPathSelectElement Method (XNode, String, IXmlNamespaceResolver)
Selects an XElement using a XPath expression, resolving namespace prefixes using the specified IXmlNamespaceResolver.
Namespace: System.Xml.XPath
Assembly: System.Xml.Linq (in System.Xml.Linq.dll)
public static XElement XPathSelectElement( this XNode node, string expression, IXmlNamespaceResolver resolver )
Parameters
- node
- Type: System.Xml.Linq.XNode
The XNode on which to evaluate the XPath expression.
- expression
- Type: System.String
A String that contains an XPath expression.
- resolver
- Type: System.Xml.IXmlNamespaceResolver
An IXmlNamespaceResolver for the namespace prefixes in the XPath expression.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type XNode. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).The following example creates an XML tree that contains a namespace. It uses an XmlReader to read the XML document. It then gets an XmlNameTable from the XmlReader, and an XmlNamespaceManager from the XmlNameTable. It uses the XmlNamespaceManager when selecting an element.
string markup = @" <aw:Root xmlns:aw='http://www.adventure-works.com'> <aw:Child1>child one data</aw:Child1> <aw:Child2>child two data</aw:Child2> </aw:Root>"; XmlReader reader = XmlReader.Create(new StringReader(markup)); XElement root = XElement.Load(reader); XmlNameTable nameTable = reader.NameTable; XmlNamespaceManager namespaceManager = new XmlNamespaceManager(nameTable); namespaceManager.AddNamespace("aw", "http://www.adventure-works.com"); XElement child1 = root.XPathSelectElement("./aw:Child1", namespaceManager); Console.WriteLine(child1);
This example produces the following output:
<aw:Child1 xmlns:aw="http://www.adventure-works.com">child one data</aw:Child1>
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.
