XPathNavigator.Matches Method

Definition

Namespace:

System.Xml.XPath

Assembly:

System.Xml.ReaderWriter.dll

Determines whether the current node matches the specified System.Xml.XPath expression.

Overloads

Matches(String)	Determines whether the current node matches the specified XPath expression.
Matches(XPathExpression)	Determines whether the current node matches the specified XPathExpression.

Matches(String)

Source:

XPathNavigator.cs

Determines whether the current node matches the specified XPath expression.

public:
 virtual bool Matches(System::String ^ xpath);

public virtual bool Matches (string xpath);

abstract member Matches : string -> bool
override this.Matches : string -> bool

Public Overridable Function Matches (xpath As String) As Boolean

Parameters

xpath

String

The XPath expression.

Returns

Boolean

true if the current node matches the specified XPath expression; otherwise, false.

Exceptions

ArgumentException

The XPath expression cannot be evaluated.

XPathException

The XPath expression is not valid.

Examples

For an example of the Matches method, see the XPathNavigator.Matches method.

Remarks

This method has no affect on the state of the XPathNavigator.

Matches(XPathExpression)

Source:

XPathNavigator.cs

Determines whether the current node matches the specified XPathExpression.

public:
 virtual bool Matches(System::Xml::XPath::XPathExpression ^ expr);

public virtual bool Matches (System.Xml.XPath.XPathExpression expr);

abstract member Matches : System.Xml.XPath.XPathExpression -> bool
override this.Matches : System.Xml.XPath.XPathExpression -> bool

Public Overridable Function Matches (expr As XPathExpression) As Boolean

Parameters

expr

XPathExpression

An XPathExpression object containing the compiled XPath expression.

Returns

Boolean

true if the current node matches the XPathExpression; otherwise, false.

Exceptions

ArgumentException

The XPath expression cannot be evaluated.

XPathException

The XPath expression is not valid.

Examples

The following example displays the titles of all novels.

XPathDocument^ document = gcnew XPathDocument("books.xml");
XPathNavigator^ navigator = document->CreateNavigator();

// Select all book nodes.
XPathNodeIterator^ nodes = navigator->SelectDescendants("book", "", false);

// Select all book nodes that have the matching attribute value.
XPathExpression^ expr = navigator->Compile("book[@genre='novel']");
while (nodes->MoveNext())
{
    XPathNavigator^ navigator2 = nodes->Current->Clone();
    if (navigator2->Matches(expr))
    {
        navigator2->MoveToFirstChild();
        Console::WriteLine("Book title:  {0}", navigator2->Value);
    }
}

XPathDocument document = new XPathDocument("books.xml");
XPathNavigator navigator = document.CreateNavigator();

// Select all book nodes.
XPathNodeIterator nodes = navigator.SelectDescendants("book", "", false);

// Select all book nodes that have the matching attribute value.
XPathExpression expr = navigator.Compile("book[@genre='novel']");
while (nodes.MoveNext())
{
    XPathNavigator navigator2 = nodes.Current.Clone();
    if (navigator2.Matches(expr))
    {
        navigator2.MoveToFirstChild();
        Console.WriteLine("Book title:  {0}", navigator2.Value);
    }
}

Dim document As XPathDocument = New XPathDocument("books.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()

' Select all book nodes.
Dim nodes As XPathNodeIterator = navigator.SelectDescendants("book", "", False)

' Select all book nodes that have the matching attribute value.
Dim expr As XPathExpression = navigator.Compile("book[@genre='novel']")
While nodes.MoveNext()
    Dim navigator2 As XPathNavigator = nodes.Current.Clone()
    If navigator2.Matches(expr) Then
        navigator2.MoveToFirstChild()
        Console.WriteLine("Book title:  {0}", navigator2.Value)
    End If
End While

The example uses the file, books.xml, as input.

<?xml version="1.0" encoding="utf-8" ?>   
<bookstore>  
    <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">  
        <title>The Autobiography of Benjamin Franklin</title>  
        <author>  
            <first-name>Benjamin</first-name>  
            <last-name>Franklin</last-name>  
        </author>  
        <price>8.99</price>  
    </book>  
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">  
        <title>The Confidence Man</title>  
        <author>  
            <first-name>Herman</first-name>  
            <last-name>Melville</last-name>  
        </author>  
        <price>11.99</price>  
    </book>  
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">  
        <title>The Gorgias</title>  
        <author>  
            <name>Plato</name>  
        </author>  
        <price>9.99</price>  
    </book>  
</bookstore>  

Remarks

This method has no effect on the state of the XPathNavigator. This method is identical to the XPathNavigator.Matches method, except that a XPathExpression object containing the compiled XPath expression is specified, rather than an XPath expression String.