XPathNavigator.AppendChild Method (XmlReader)


Creates a new child node at the end of the list of child nodes of the current node using the XML contents of the XmlReader object specified.

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

public virtual void AppendChild(
	XmlReader newChild


Type: System.Xml.XmlReader

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

Exception Condition

The XmlReader object is in an error state or closed.


The XmlReader object parameter is null.


The current node the XPathNavigator is positioned on is not the root node or an element node.


The XPathNavigator does not support editing.


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

Appending a child node adds the new node to the end of the list of child nodes for the current node. For example, when three child nodes exist for an element, the appended node becomes the fourth child node. If no child nodes exist, then a new child node is created.

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

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

  • The AppendChild method is valid only when the XPathNavigator is positioned on the root node or an element node.

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

In the following example, a new pages child element is appended to the list of child elements 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 child element is appended using the same namespace as the XML document.

XmlDocument document = new XmlDocument();
XPathNavigator navigator = document.CreateNavigator();

navigator.MoveToChild("bookstore", "http://www.contoso.com/books");
navigator.MoveToChild("book", "http://www.contoso.com/books");

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



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>
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">
        <title>The Confidence Man</title>
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">
        <title>The Gorgias</title>

.NET Framework
Available since 2.0
Available since 4.0
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