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Table 5-4: Properties of the XmlNode Class Property Description LocalName Returns the name of the node, minus the namespace. Name NamespaceURI NextSibling Returns the fully qualified name of the node. Gets the namespace URI of the current node. Gets the node immediately following the current node. Siblings are nodes with the same parent and the same depth. Returns the type of the current node as a value taken from the XmlNodeType enumeration. Gets the markup code representing the current node and all of its children. Unlike InnerXml, OuterXml also includes the node itself in the markup with all of its attributes. InnerXml, on the other hand, returns only the markup found below the node, including text. Gets the XmlDocument object to which the current node belongs. Gets the parent of the current node (if any). Gets or sets the namespace prefix of the current node. Gets the node immediately preceding the current node. Gets or sets the value of the current node.
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The collection of child nodes is implemented as a linked list. The ChildNodes property returns an internal object of type XmlChildNodes. (The object is not documented, but you can easily verify this claim by simply checking the type of the object that ChildNodes returns.) You don't need to use this object directly, however. Suffice to say that it merely represents a concrete implementation of the XmlNodeList class, whose methods are, for the most part, marked as abstract. In particular, XmlChildNodes implements the Item and Count properties and the GetEnumerator method. XmlChildNodes is not a true collection and does not cache any information. When you access the Count property, for example, it scrolls the entire list, counting the number of nodes on the fly. When you ask for a particular node through the Item property, the list is scanned from the beginning until a matching node is found. To move through the list, the XmlChildNodes class relies on the node's NextSibling method. But which class actually implements the NextSibling method Both NextSibling and PreviousSibling are defined in the XmlLinkedNode base class. XmlLinkedNode stores an internal pointer to the next node in the list. The object referenced is simply what NextSibling returns. Figure 5-3 how things work.
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Figure 5-3: The XmlLinkedNode class's NextSibling method lets applications navigate through the children of each node. Scrolling forward through the list of child nodes is fast and effective. The same can't be said for backward scrolling. The list of nodes is not double-linked, and each node doesn'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 beginning to the node that precedes the current one. Tip To summarize, when you are processing XML subtrees, try to minimize calls to PreviousSibling, Item, and Count because they always walk through the entire collection of subnodes to get their expected output. Whenever possible, design your code to take advantage of forward-only movements and perform them using NextSibling.
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Methods of the XmlNode Class Table 5-5 lists the methods exposed by the XmlNode class.
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Table 5-5: Methods of the XmlNode Class Method Description AppendChild Adds the specified node to the list of children of the current node. The node is inserted at the bottom of the list. Clone Creates a duplicate of the current node. For element nodes, duplication includes child nodes and attributes. Creates a duplicate of the current node. Takes a Boolean argument indicating whether cloning should proceed recursively. If this argument is true, calling the CloneNode method is equivalent to calling Clone. Entity and notation nodes can't be cloned. Returns an internal and node-specific object that implements the IEnumerator interface. The returned object provides the support needed to arrange for-each iterations. 180
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