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XPathNavigator.InsertBefore Method (XmlReader)

Creates a new sibling node before the currently selected node using the XML contents of the XmlReader object specified.

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

public virtual void InsertBefore (
	XmlReader newSibling
)
public void InsertBefore (
	XmlReader newSibling
)
public function InsertBefore (
	newSibling : XmlReader
)
Not applicable.

Parameters

newSibling

An XmlReader object positioned on the XML data for the new sibling 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 position of the XPathNavigator does not allow a new sibling node to be inserted before the current node.

NotSupportedException

The XPathNavigator does not support editing.

XmlException

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

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

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

  • The InsertBefore method is valid only when the XPathNavigator is positioned on an element, text, processing instruction, or comment node.

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

In the following example a new pages element is inserted before the price child element 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 sibling element is inserted 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");
navigator.MoveToChild("price", "http://www.contoso.com/books");

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

navigator.InsertBefore(pages);

navigator.MoveToParent();
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 Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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