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IXMLDOMNode.insertBefore (C#)

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IXMLDOMNode.insertBefore (C#)

The insertBefore method inserts a child node before the specified node or at the end of the list.

Syntax

  IXMLDOMNode = IXMLDOMNode
  .insertBefore(
  object objnewChild,
 object objrefChild
);

Parameters

objnewChild

[in] object containing the address of the new node to be inserted.

objrefChild

[in] object containing the address of the reference node. If this parameter is NULL, objnewChild is inserted at the end of the child list.

Return Values

When getting the value, this method returns the child node that was successfully inserted.

Remarks

When inserting a new child node into a list of existing nodes, the new child must be a valid child type for the existing parent node. The following tables list which child node types are valid and not valid for the parent node types specified.

The following table lists possible child node types for the parent node type NODE_ATTRIBUTE.

Child node type Description
NODE_ATTRIBUTE
NODE_COMMENT
NODE_ELEMENT		 Not valid. Returns an error. These node types cannot be children of an attribute.
NODE_PROCESSING_INSTRUCTION Not valid. Returns an error. This node type either cannot be a child of an attribute node or it is read-only.
NODE_TEXT Inserts objnewChild and returns objnewChild.

The following table lists possible child node types for the parent node type NODE_DOCUMENT.

Child node type Description
NODE_ATTRIBUTE
NODE_DOCUMENT
NODE_TEXT		 Not valid. Returns an error. These nodes cannot be children of a document node.
NODE_COMMENT
NODE_PROCESSING_INSTRUCTION		 Inserts objnewChild and returns objnewChild.
NODE_ELEMENT Inserts objnewChild and returns objnewChild. By definition, an XML document (the document node) can have only a single child element. Therefore, an error is returned if the document node already has a child element.

The following table lists possible child node types for the parent node type NODE_ELEMENT.

Child node type Description
NODE_ATTRIBUTE
NODE_DOCUMENT		 Not valid. Returns an error. These node types cannot be children of an element node.
NODE_COMMENT
NODE_ELEMENT
NODE_PROCESSING_INSTRUCTION
NODE_TEXT		 Inserts objnewChild and returns objnewChild.

The node supplied in objrefChild must be a child node of this node or NULL. The objnewChild is inserted before objrefChild in the child list. If objrefChild is NULL, objnewChild is inserted at the end of the child list. If objrefChild is not a child of this node, an error is returned.

Example Code

The following example creates a new IXMLDOMNode object and inserts it before the second child of the top-level node.

using Microsoft.WindowsMediaServices.Interop;
using interop_msxml;

// Declare variables.
WMSServer Server;
IXMLDOMDocument Playlist;
IXMLDOMElement Root;
IXMLDOMNode newNode;
IXMLDOMNode currNode;

try {
    // Create a new WMSServer object.
    Server = new WMSServerClass();

    // Create a new playlist object.
    Playlist = Server.CreatePlaylist();

    // Load a playlist.
    Playlist.load("file://c:\\wmpub\\wmroot\\simple.wsx");

    // Retrieve the root element.
    Root = Playlist.documentElement;

    // Create a new node and insert it before the second child node
    // of the root element.
    newNode = Playlist.createNode(DOMNodeType.NODE_ELEMENT, "seq", "");
    currNode = Root.insertBefore(newNode, Root.childNodes[1]);
}
catch (Exception e) {
    // TODO: Handle exceptions.
}

Requirements

Reference: Add references to Microsoft.WindowsMediaServices and interop_msxml.

Namespace: Microsoft.WindowsMediaServices.Interop, interop_msxml.

Assembly: Microsoft.WindowsMediaServices.dll, interop_msxml.dll.

Library: WMSServerTypeLib.dll, msxml.dll.

Platform: Windows Server 2003 family, Windows Server 2008 family.

See Also

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