XPathNavigator.Compile Method (String)


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Compiles a string representing an XPath expression and returns an XPathExpression object.

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

public virtual XPathExpression Compile(
	string xpath


Type: System.String

A string representing an XPath expression.

Return Value

Type: System.Xml.XPath.XPathExpression

An XPathExpression object representing the XPath expression.

Exception Condition

The xpath parameter contains an XPath expression that is not valid.


The XPath expression is not valid.

An XPath expression is evaluated to yield one of the following return types:

  • Node Set: an unordered collection of nodes without duplicates

  • Boolean: true or false

  • Number: a floating-point number

  • String: a sequence of UCS characters

Expressions that return a node set can be used in the Select and Evaluate methods. Expressions that return a Boolean, number, or string can be used in the Evaluate method. The rules on valid expressions for the Matches method are specific to that method.

.NET Framework
Available since 1.1
Available since 4.0
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