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XPathNavigator.Compile Method

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.


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

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.