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Improving Performance by Using Name Tables
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Whenever XmlTextReader parses any XML file, it creates a list of element names found in that document. This list is called a name table. Imagine that you are parsing dozens of separate files that have the same structure as that of Employees.xml. That means the XmlTextReader class needs to generate the same name table again and again. You can improve the efficiency of this process by supplying a ready-made name table, represented by the XmlNameTable class, for further parsing. The XmlNameTable class is an abstract class, but the .NET Framework provides a class called NameTable that inherits from it. You can therefore use this NameTable class in your code. The code fragment in Listing 3-3 will make the use of name tables clear. Listing 3-3. Using Name Tables NameTable table = new NameTable(); XmlTextReader reader1 = new XmlTextReader(Application.StartupPath + @"\employees1.xml",table); XmlTextReader reader2 = new XmlTextReader(Application.StartupPath + @"\employees2.xml",table); XmlTextReader reader3 = new XmlTextReader(Application.StartupPath + @"\employees3.xml",table); //process further
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C HAPTE R 3 READING A ND WRITIN G XML DOC UMEN TS
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The code creates a new instance of the NameTable class, which will naturally be empty. Then an instance of XmlTextReader is created. This time the constructor takes two parameters: a filename and a NameTable. When you read the XML document for the first time, that is, using reader1, the supplied NameTable instance is populated. That means we have a NameTable ready for use. The same NameTable is supplied as a parameter to reader2 and reader3; they will in turn use this ready-made NameTable, thus improving the efficiency of the code.
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Dealing with Namespaces
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The XmlTextReader class has the same three XML namespace-related properties as the XmlNode class. The properties are NamespaceURI, Prefix, and LocalName. Their meaning is the same as already discussed in 2.
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Moving Between Elements
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In the previous example, you learned how to navigate through and read an XML document by using XmlTextReader. There are some additional methods of XmlTextReader that allow you to move between elements and read the content. This section presents these methods.
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The ReadSubTree() Method
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The ReadSubTree() method reads subnodes of the current node and returns the subtree as another XmlReader instance. This method is useful when you are parsing huge documents but want to work with a small section at a time. Figure 3-3 shows pictorially how this method works.
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Figure 3-3. Using the ReadSubTree() method
CHAPTER 3 REA DING A ND WRITING XML DOCUME NTS
From the figure you can see that if you call ReadSubTree() when your XmlTextReader is on an <employee> node of the document, the ReadSubTree() method returns another XmlReader containing that <employee> node and all its child nodes (that is, the subtree of the <employee> node).
The ReadToDescendant() Method
The ReadToDescendant() method advances the XmlTextReader to the next occurrence of the specified child node. This method comes in handy when you want to jump to a specific node rather than sequentially moving there. Figure 3-4 shows how this method works.
Figure 3-4. Using the ReadToDescendant() method As shown in Figure 3-4, if you call the ReadToDescendant() method when you are on an <employee> node and specify notes as the target element, your reader jumps to the next <notes> element.
The ReadToFollowing() Method
The ReadToFollowing() method is very similar to the ReadToDescendant() method, with one difference. The ReadToDescendant() method can jump to the specified element only if it is a descendant of the current node, whereas the ReadToFollowing() method jumps to the first occurrence of the specified element, be it a descendant or not.
C HAPTE R 3 READING A ND WRITIN G XML DOC UMEN TS
Note Notice the difference between the ReadToDescendant() and ReadToFollowing() methods.
Assuming that you are on the <firstname> node of the second employee and wish to jump to the <notes> node of the same employee, you would use the ReadToDescendant() method. On the other hand, if you are on the <firstname> node of the second employee and wish to jump to the next occurrence of the <firstname> node, you would use the ReadToFollowing() method.
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