InsertBefore Method (XPathNavigator)
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XPathNavigator.InsertBefore Method (XPathNavigator)

 

Creates a new sibling node before the currently selected node using the nodes in the XPathNavigator specified.

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

public virtual void InsertBefore(
	XPathNavigator newSibling
)

Parameters

newSibling
Type: System.Xml.XPath.XPathNavigator

An XPathNavigator object positioned on the node to add as the new sibling node.

Exception Condition
ArgumentNullException

The XPathNavigator 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.

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

  • If the XPathNavigator 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 node contained in the XPathNavigator 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");

XmlDocument childNodes = new XmlDocument();
childNodes.Load(new StringReader("<pages xmlns=\"http://www.contoso.com/books\">100</pages>"));
XPathNavigator childNodesNavigator = childNodes.CreateNavigator();

navigator.InsertBefore(childNodesNavigator);

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
Available since 2.0
Silverlight
Available since 4.0
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