Applied XML Programming for Microsoft .NET.pdf - Csbdu.in

Figure 5-3: The XmlLinkedNode class's NextSibling method lets applications navigatethrough the children of each node.Scrolling forward through the list of child nodes is fast and effective. The same can't besaid for backward scrolling. The list of nodes is not double-linked, and each nodedoesn't also store a pointer to the previous one in the list. For this reason,PreviousSibling reaches the target node by walking through the list from the beginningto the node that precedes the current one.TipTo summarize, when you are processing XML subtrees, try tominimize calls to PreviousSibling, Item, and Count because theyalways walk through the entire collection of subnodes to get theirexpected output. Whenever possible, design your code to takeadvantage of forward-only movements and perform them usingNextSibling.Methods of the XmlNode ClassTable 5-5 lists the methods exposed by the XmlNode class.Table 5-5: Methods of the XmlNode ClassMethodAppendChildCloneCloneNodeGetEnumeratorDescriptionAdds the specified node to the list of children ofthe current node. The node is inserted at thebottom of the list.Creates a duplicate of the current node. Forelement nodes, duplication includes child nodesand attributes.Creates a duplicate of the current node. Takes aBoolean argument indicating whether cloningshould proceed recursively. If this argument istrue, calling the CloneNode method is equivalentto calling Clone. Entity and notation nodes can'tbe cloned.Returns an internal and node-specific object thatimplements the IEnumerator interface. Thereturned object provides the support needed toarrange for-each iterations.180