XPathNodeIterator.Current Property


When overridden in a derived class, gets the XPathNavigator object for this XPathNodeIterator, positioned on the current context node.

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

Public MustOverride ReadOnly Property Current As XPathNavigator

Property Value

Type: System.Xml.XPath.XPathNavigator

An XPathNavigator object positioned on the context node from which the node set was selected. The MoveNext method must be called to move the XPathNodeIterator to the first node in the selected set.

You can use the properties of the returned XPathNavigator object to obtain information on the current node. However, the returned XPathNavigator object should not be modified. The returned XPathNavigator object cannot be moved away from the selected node set.

Alternatively, you can clone the XPathNavigator object using the Clone method of the XPathNavigator class. The cloned XPathNavigator object can then be moved away from the selected node set. This method of cloning the XPathNavigator object might affect the performance of the XPath query.

If the SelectAncestors, SelectDescendants, and SelectChildren methods result in no nodes being selected, the Current property might not be pointing to the context node.

To test whether nodes have been selected, use the Count property as shown in the following example.

The following example gets all book titles authored by Herman Melville using the Current property of the XPathNodeIterator object and the Clone method of the XPathNavigator class.

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

' Select all books authored by Melville.
Dim nodes As XPathNodeIterator = navigator.Select("descendant::book[author/last-name='Melville']")

While nodes.MoveNext()
    ' Clone the navigator returned by the Current property. 
    ' Use the cloned navigator to get the title element.
    Dim clone As XPathNavigator = nodes.Current.Clone()
    Console.WriteLine("Book title: {0}", clone.Value)
End While

The example takes the contosoBooks.xml file as input.

<?xml version="1.0" encoding="utf-8" ?>
<bookstore xmlns="http://www.contoso.com/books">
    <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">
        <title>The Autobiography of Benjamin Franklin</title>
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">
        <title>The Confidence Man</title>
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">
        <title>The Gorgias</title>

.NET Framework
Available since 1.1
Available since 4.0
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