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Element [fm] = Element [p] = Text [#text] = Text placed in the public domain by Moby Lexical Tools, 1992 Element [p] = Text [#text] = SGML markup by Jon Bosak, 1992-1994 Element [LINE] = Text [#text] = Took off her life; this, and what needful else Element [LINE] = Text [#text] = That calls upon us, by the grace of Grace, Element [LINE] = Text [#text] = We will perform in measure, time and place: Element [LINE] = Text [#text] = So, thanks to all at once and to each one, Element [LINE] = Text [#text] = Whom we invite to see us crown'd at Scone Element [STAGEDIR] = Text [#text] = Flourish Exeunt
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In this example, we used the Load() method of the XmlDocument object to read the document into the DOM Next we will look at how to work with the XmlReader and XmlWriter classes
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With the XmlReader class, you can process the XML document using techniques similar to the ones available in the Simple API for XML (SAX) packages The XmlReader class is an abstract base class that provides the ability to read and parse an XML file in a forward-only, read-only, non-cached manner for a number of classes that inherit from it The following classes are derived from the XmlReader class: XmlTextReader schemas XmlNodeReader schemas Reads character streams This class has no support for Parses XML DOM trees This class has no support for Provides a fully compliant validating XML parser
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EXAM TIP The XmlReader class is the base class for a number of specialized readers To show the XmlReader in action, we will build a program that is based on the XmlTextReader class This example will read, parse, and display an XML file Create a C# source file in the same directory that contains the Macbethxml file, and name it XmlReadercs Using your favorite editor, enter the following code into the XmlReadercs file
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// XmlReadercs using System;
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using SystemIO; using SystemXml; public class ReadXml { public static void Main(string[] argh) { StreamReader stream = null; try { string XmlFileName = "Employeesxml"; if (arghLength > 0) { XmlFileName = argh[0]; } ConsoleWriteLine("Reading XML "); stream = new StreamReader(XmlFileName); XmlTextReader reader = new XmlTextReader(stream); readerWhitespaceHandling = WhitespaceHandlingNone; ReadXmlReadIt(reader); } catch (Exception e) { ConsoleWriteLine("Exception: {0}", eToString()); } finally { if (stream != null) streamClose(); } } public static void ReadIt(XmlTextReader r) { int i = 0; try { while (rRead()) { i++; ConsoleWrite("Read[{0,3}]:", i); PrintInfo(ConsoleOut, r); } } catch (Exception e) { ConsoleWriteLine("Exception: {0}", eToString()); } } public static void PrintInfo(TextWriter cOut, XmlReader r) { if (rHasValue) { cOutWrite("{0} [{1}] = {2} ", rNodeType, rName, rValue); } else { cOutWrite("{0} [{1}] ", rNodeType, rName); } if (rHasAttributes)
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{ while (rMoveToNextAttribute()) { cOutWrite("{0} [{1}] = {2} ", rNodeType, rName, rValue); } } cOutWrite("\n"); } }
The bold line in the preceding code specifies the handling of whitespace in the XML document The WhitespaceHandling parameter is set to WhitespaceHandlingNone, which ignores any whitespace To compile the program, use the command-line compiler csc The XML file that is hard-coded in the program is Employeesxml, and it contains the following data:
< xml version="10" > <employees> <employee> <name>John Smith</name> <salary>54000</salary> </employee> <employee> <name>Robert Jones</name> <salary>61000</salary> </employee> <employee> <name>Sue Brown</name> <salary>65000</salary> </employee> </employees>
When you run the program, the output produced shows the document parsed into its nodes, as can be seen here:
F:\xml>xmlreader Reading XML Read[ 1]:XmlDeclaration [xml] = version="10" Attribute [version] = 10 Read[ 2]:Element [employees] Read[ 3]:Element [employee] Read[ 4]:Element [name] Read[ 5]:Text [] = John Smith Read[ 6]:EndElement [name] Read[ 7]:Element [salary] Read[ 8]:Text [] = 54000 Read[ 9]:EndElement [salary] Read[ 10]:EndElement [employee] Read[ 11]:Element [employee] Read[ 12]:Element [name] Read[ 13]:Text [] = Robert Jones Read[ 14]:EndElement [name] Read[ 15]:Element [salary] Read[ 16]:Text [] = 61000 Read[ 17]:EndElement [salary] Read[ 18]:EndElement [employee] Read[ 19]:Element [employee]
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