D5 XPathNavigator Query Methods in .NET

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Table D5 XPathNavigator Query Methods
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Method Name Select Description Takes an XPath expression as a string or a compiled XPathExpression object and returns an XPathNodeIterator containing the nodes that matched the query Evaluate Takes a precompiled XPathExpression object and executes the query, returning an XPathNodeIterator containing the nodes that matched the query SelectChildren Lets you select all child nodes of the current node with a particular node type or all child elements of a given name This only selects matching nodes that are one level under the current node in the node hierarchy Lets you select all descendant nodes of the current node with a particular node type or all descendant elements of a given name This selects all matching nodes, regardless of their level in the node hierarchy Lets you select all parent nodes of the current node with a particular node type or all parent elements of a given name This selects all matching nodes, regardless of how far up the inheritance hierarchy they are
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SelectDescendants
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The XPathNodeIterator class follows the pattern of other iterators in the NET Framework It starts out positioned just before the first item in the collection it contains You repeatedly call the MoveNext method, usually in a while loop, and inspect the Boolean return value If the value is true, then there was another node to move to and the iterator will be positioned on that node If it returns false, there are no more nodes to iterate through through the results The following code demonstrates the process of loading a document, performing a query, and iterating
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private void NodeIteration() { // Load the document XPathDocument doc = new XPathDocument("Customersxml"); // Get the navigator XPathNavigator nav = docCreateNavigator(); // Perform the query XPathNodeIterator iter = navSelect("//CompanyName"); // Iterate through the results while (iterMoveNext()) { ConsoleWriteLine(iterCurrentValue); } }
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The Current property on the iterator returns a reference to anXPathNavigator positioned on the current node, which you can then use to access the node contents or perform navigation or further queries based on that node This example accesses the Value property of the current node, which in the case of an element or attribute is just the contained text content There is also a Name property, which returns the name of the node The complexity of the results returned depends on the complexity of the query that you issue For something simple like this query that just returns a set of elements that contain text nodes with the values you are after, the code is pretty straightforward However, the results of an XPath query could return any type of node, so you will often need to have some conditional logic that checks the node type of each node, as it iterates through them, and modifies what it does based on the node type The node type is exposed through the NodeType property on the XPathNavigator, and it returns an enumeration of typeXPathNodeType
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Navigating an XML Document
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Each of the different XML document types has a variety of specialized navigation methods that depend on the specific object model that they expose However, all of the XML document types let you obtain anXPathNavigator for the document, which allows you to query and navigate those documents in a consistent way using the preferred object model for working with XML in NET In the previous section, you saw how to perform queries against a document, returning an iterator that you could use to step through each of the nodes that matched the query and perform processing on it To work with the node, you obtained an XPathNavigator reference to the node from the iterator's Current property Once you have an XPathNavigator to a particular node, you will often need to perform some navigation through the object model based on your current position within it For example, if you have selected a set of Order elements, you may need to navigate through the attributes on that element to extract their values Or perhaps you will perform a query to obtain an element representing a Customer, and then want to navigate all the child elements to extract their values without performing individual queries for each element The XPathNavigator exposes a set of MoveToXXX methods that let you navigate the object model it exposes, where theXXX portion of the method name indicates the node to which it moves the navigator's cursor (see Table D6) Each of the MoveToXXX methods returns a Boolean indicating whether the move was successful, meaning there was a node in the intended location to move to Note that attributes and namespaces are treated as special kinds of nodes because they can only be contained within the opening tag of an element node To navigate attributes or namespaces, you use the separate set of MoveToXXX methods shown in Table D7
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