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

 

Creates a new sibling node before the currently selected node using the XML string specified.

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

public virtual void InsertBefore(
	string newSibling
)

Parameters

newSibling
Type: System.String

The XML data string for the new sibling node.

Exception Condition
ArgumentNullException

The XML string 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 string parameter is not well-formed.

To create a new element node, include all XML syntax in the XML string parameter. The string for a new book node is InsertBefore("<book/>"). The string for inserting the text "book" before the current node's text node is InsertBefore("book"). If the XML string contains multiple nodes, all nodes are added.

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

  • 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.

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");

navigator.InsertBefore("<pages>100</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
Available since 2.0
Silverlight
Available since 4.0
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