XPathNavigator.InsertBefore Method (XmlReader)
Assembly: System.Xml (in system.xml.dll)
| Exception type | Condition |
|---|---|
| The XmlReader object is in an error state or closed. | |
| The XmlReader object parameter is a null reference (Nothing in Visual Basic). | |
| The position of the XPathNavigator does not allow a new sibling node to be inserted before the current node. | |
| The XPathNavigator does not support editing. | |
| 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 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.
