vb.net code 39 Attribute and Namespace Node Navigation in Visual Basic .NET

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Attribute and Namespace Node Navigation
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Method MoveTo()
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Although attributes and namespaces are considered nodes, they are not navigable using the node navigation methods discussed in the preceding section. Instead, XPathNavigator implements methods specifically for navigating the attributes and namespaces contained in the current node. Using these methods makes an attribute or namespace node the current node and makes information available through the properties of the XPathNavigator instance as
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11. XML Processing
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with any other node. Table 11-19 summarizes the method of XPathNavigator for navigating attributes and namespaces.
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Table 11-19. XPathNavigator Methods for Navigating Attributes and Namespaces
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Method Attributes MoveToAttribute() MoveToFirstAttribute() MoveToNextAttribute() Namespaces MoveToNamespace()
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Comment Moves the cursor to the attribute of the current element node that has the specified name. Moves the cursor to the first attribute of the current element node. Moves the cursor to the next attribute of the containing element. If not positioned on an attribute node, the cursor will not move.
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Moves the cursor to the specified namespace of the current element node. MoveToFirstNamespace() Moves the cursor to the first namespace of the current element node. MoveToNextNamespace() Moves the cursor to the next namespace of the containing element. If not positioned on a namespace node, the cursor will not move. Other After working with attribute or namespace nodes, returns the MoveToParent() cursor to the parent element node. The following example demonstrates the use of the foregoing methods to navigate across the namespaces and attributes of a node and print information for each.
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XML Input (stored in file named test.xml):
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< xml version='1.0' > <root> <node1 xmlns:a='someNamespaceUri' att1='abc' att2='cde'> <node2 xmlns:b='someOtherNamespaceUri' att1='xyz'/> </node1> </root>
Code:
using System; using System.Xml; using System.Xml.XPath; public class xmltest { public static void Main () { XPathNavigator myNav = new XPathDocument("test.xml").CreateNavigator(); XPathNodeIterator myIt = myNav.SelectDescendants(XPathNodeType.Element,true);
11. XML Processing while (myIt.MoveNext()) { XPathNavigator curNode = myIt.Current; Console.WriteLine("Inspecting node : {0}", curNode.LocalName); if (curNode.MoveToFirstAttribute()) { do { Console.WriteLine("\tAttribute: {0} = {1}", curNode.LocalName, curNode.Value); } while (curNode.MoveToNextAttribute()); curNode.MoveToParent(); } if (curNode.MoveToFirstNamespace()) { do { Console.WriteLine("\tNamespace: {0} = {1}", curNode.LocalName, curNode.Value); } while (curNode.MoveToNextNamespace()); curNode.MoveToParent(); } } } }
Output:
Inspecting node : root Namespace: xml = http://www.w3.org/XML/1998/namespace Inspecting node : node1 Attribute: att1 = abc Attribute: att2 = cde Namespace: a = someNamespaceUri Namespace: xml = http://www.w3.org/XML/1998/namespace Inspecting node : node2 Attribute: att1 = xyz Namespace: b = someOtherNamespaceUri Namespace: a = someNamespaceUri Namespace: xml = http://www.w3.org/XML/1998/namespace
Node Properties
As with XmlReader, the information about the current node is available through the properties of the XPathNavigator instance. The properties available are a subset of those available through XmlReader and include the following: BaseURI, HasAttributes, HasChildren, IsEmptyElement, LocalName, Name, NamespaceURI, NodeType, Prefix, Value, and XmlLang. We won't discuss these properties in detail here; refer to the .NET documentation for complete details.
Queries
The primary benefit of XPathNavigator is the support for querying the contained data by using XPath expressions. The XPath expression can be passed to XPathNavigator methods either as a string or as an instance of System.Xml.XPath.XPathExpression. The XPathExpression class encapsulates a precompiled XPath expression. Instances are created using the XPathNavigator.Compile method passing a String argument containing the
11. XML Processing
XPath expression. There are three key benefits to using instances of XPathExpression over using strings:
It is more efficient to compile an XPath expression if it is to be used repeatedly. The XPathExpression.AddSort method enables the configuration of sorting characteristics for node sets selected by the expression. The XPathExpression.ReturnType property returns a member of the XPathResultType enumeration that identifies which result type the encapsulated XPath expression will return.
The XPathNavigator doesn't provide individual methods that map to the different types of expressions defined in the XPath specification. Instead, XPath expressions are evaluated primarily through three methods of XPathNavigator: Select, Evaluate, and Matches. The difficulty with using a standard set of methods for all expressions is that different XPath expressions return different data types. These are
Node Set, an unordered collection of nodes XPathNodeIterator class encapsulates a node set. boolean, true or false number, a floating-point number string, a sequence of UCS characters
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