O'Reilly logo

C# in a Nutshell by Peter Drayton, Ted Neward, Ben Albahari

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 45. System.Xml.XPath

XPath is a W3C specification for locating nodes in an XML document. It provides an expression syntax that can determine a node based on its type, location, and relation to other nodes in a document. XPath is generally not useful alone, but works in conjunction with other tools, especially XSLT. Figure 45-1 shows the types in this namespace.

System.Xml.XPath provides types that evaluate expressions and match nodes in XML documents. XPathDocument is a document object designed to provide fast document navigation through XPath, and is used by the System.Xml.Xsl classes for XSLT transformations. XPathNavigator is the core entry point for doing XPath expressions; it is abstract, allowing for more than just XML documents to be XPath-navigated. For example, an ADO.NET provider could, if it desired, implement the IXPathNavigable interface and return an XPathNavigator that translated XPath queries into a SQL SELECT statement. (See Aaron Skonnard’s MSDN Magazine article “Writing XML Providers for Microsoft .NET” for more details about using XML-based technologies over data sources other than XML documents.)

The System.Xml.XPath namespace

Figure 45-1. The System.Xml.XPath namespace

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required