XPathNavigator.PrependChild Method (XmlReader)

Note: This method is new in the .NET Framework version 2.0.

Creates a new child node at the beginning of the list of child nodes of the current node using the XML contents of the XmlReader object specified.

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

public virtual void PrependChild (
	XmlReader newChild
)
public void PrependChild (
	XmlReader newChild
)
public function PrependChild (
	newChild : XmlReader
)

Parameters

newChild

An XmlReader object positioned on the XML data for the new child node.

Exception typeCondition

ArgumentException

The XmlReader object is in an error state or closed.

ArgumentNullException

The XmlReader object parameter is a null reference (Nothing in Visual Basic).

InvalidOperationException

The current node the XPathNavigator is positioned on does not allow a new child node to be prepended.

NotSupportedException

The XPathNavigator does not support editing.

XmlException

The XML contents of the XmlReader object parameter is not well-formed.

Prepending a child node adds the new node to the beginning of the list of child nodes for the current node. For example, when three child nodes exist for an element, the prepended node becomes the first child node. If no child nodes exist, then a new child node is created.

The following are important notes to consider when using the PrependChild method.

  • If the XmlReader object is positioned over a sequence of XML nodes, all the nodes in the sequence are added.

  • The PrependChild method is valid only when the XPathNavigator is positioned on an element node.

  • The PrependChild method does not affect the position of the XPathNavigator.

In the following example, a new pages child element is prepended to the beginning of the list of child elements of the first book element in the contosoBooks.xml file using the XmlReader object specified. The http://www.contoso.com/books namespace is specified so that the new child element is prepended using the same namespace as the XML document.

XmlDocument document = new XmlDocument();
document.Load("contosoBooks.xml");
XPathNavigator navigator = document.CreateNavigator();

navigator.MoveToChild("bookstore", "http://www.contoso.com/books");
navigator.MoveToChild("book", "http://www.contoso.com/books");

XmlReader pages = XmlReader.Create(new StringReader("<pages xmlns=\"http://www.contoso.com/books\">100</pages>"));

navigator.PrependChild(pages);

Console.WriteLine(navigator.OuterXml);

The example takes the contosoBooks.xml file as an input.

<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>
        <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>

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0

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