XmlNode.InsertBefore Method (XmlNode, XmlNode)
Inserts the specified node immediately before the specified reference node.
Assembly: System.Xml (in System.Xml.dll)
Public Overridable Function InsertBefore ( newChild As XmlNode, refChild As XmlNode ) As XmlNode
The XmlNode to insert.
The XmlNode that is the reference node. The newChild is placed before this node.
Return ValueType: System.Xml.XmlNode
The node being inserted.
The current node is of a type that does not allow child nodes of the type of the newChild node.
The newChild is an ancestor of this node.
The newChild was created from a different document than the one that created this node.
The refChild is not a child of this node.
This node is read-only.
If refChild is null, insert newChild at the end of the list of child nodes. All the contents of the newChild are inserted, in the same order, before refChild. If the newChild is already in the tree, it is removed from its original position and added to its target position. For more information about inserting nodes, see Inserting Nodes into an XML Document.
If the node being inserted was created from another document, you can use XmlDocument.ImportNode to import the node to the current document. The imported node can then be inserted into the current document.
Notes to Inheritors:
When overriding InsertBefore in a derived class, in order for events to be raised correctly, you must call the InsertBefore method of the base class.
The following example adds a new node to the XML document.
Option Strict Option Explicit Imports System Imports System.IO Imports System.Xml Public Class Sample Public Shared Sub Main() Dim doc As New XmlDocument() doc.LoadXml("<book genre='novel' ISBN='1-861001-57-5'>" & _ "<title>Pride And Prejudice</title>" & _ "</book>") Dim root As XmlNode = doc.DocumentElement 'Create a new node. Dim elem As XmlElement = doc.CreateElement("price") elem.InnerText = "19.95" 'Add the node to the document. root.InsertBefore(elem, root.FirstChild) Console.WriteLine("Display the modified XML...") doc.Save(Console.Out) End Sub 'Main End Class 'Sample
Available since 10
Available since 1.1