Evaluates the System.Xml.XPath.XPathExpression and returns the typed result.
Syntax
public virtual object Evaluate (XPathExpression expr)
Parameters
- expr
Returns
The result of the expression (Boolean, number, string, or node set). This maps to bool, double, string, or System.Xml.XPath.XPathNodeIterator objects respectively.
Remarks
The following C# code returns a number after converting the Price/text() node to a number and multiplying the value by 10.
Example
XPathExpression expr = nav.Compile("Price/text()*10");
nav.Evaluate(expr);Note:
The XPath position() and last() functions, unless used as a predicate in a location step, require a reference to a node set in order to be evaluated. In this case, you must use the overload which takes an System.Xml.XPath.XPathNodeIterator as an argument; otherwise, position() and last() return 0.
This method has no effect on the state of the System.Xml.XPath.XPathNavigator.
Requirements
Namespace: System.Xml.XPath
Assembly: System.Xml (in System.Xml.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0
Assembly: System.Xml (in System.Xml.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0