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
)

Parameters

newSibling
Type: System.Xml.XmlReader

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

ExceptionCondition
ArgumentException

The XmlReader object is in an error state or closed.

ArgumentNullException

The XmlReader object parameter is null.

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.

<?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>
        <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>

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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