Applied XML Programming for Microsoft .NET.pdf - Csbdu.in

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Chapter 5: The XML .NET Document Object ModelOverviewIn addition to XML readers and writers, the Microsoft .NET Framework provides classesthat parse XML documents according to the W3C Document Object Model (DOM) Level1 Core and the DOM Level 2 Core. These classes, available in the System.Xmlnamespace, build a complete in-memory representation of the contents of an XMLdocument and make it programmatically accessible during both read and writeoperations.The structure of the XML Document Object Model (XML DOM) is a generalspecification that is implemented using platform-specific features and components. TheMSXML library provides a COM-based XML DOM implementation for the MicrosoftWin32 platform. The System.Xml assembly provides a .NET Framework-specificimplementation of the XML DOM centered on the XmlDocument class.Although it is stored as flat text in a linear text file, XML content is inherentlyhierarchical. Readers simply parse the text as it is read out of the input stream. Theynever cache read information and work in a stateless fashion. As a result of thisarrangement, you can neither edit nodes nor move backward. The limited navigationcapabilities also prevent you from implementing node queries of any complexity. TheXML DOM philosophy is quite different. XML DOM loads all the XML content in memoryand exposes it through a suite of collections that, overall, offer a tree-basedrepresentation of the original content. In addition, the supplied data structure is fullysearchable and editable.Advanced searching and editing are the primary functions of the XML DOM, whereasreaders (and Simple API for XML [SAX] parsers as well) are optimized for documentinspection, simple searching, and any sort of read-only activity. In Chapter 2, weexplored the characteristics of pull mode readers. Let's analyze now the .NETFramework programming interface for full-access XML document processing.The XML DOM Programming InterfaceThe central element in the .NET XML DOM implementation is the XmlDocument class.The XmlDocument class represents an XML document and makes it programmable byexposing its nodes and attributes through ad hoc collections. Let's consider a simpleXML document:1NancyDavolio2AndrewFuller169
3JanetLeverlingWhen processed by an instance of the XmlDocument class, this file creates a tree likethe one shown in Figure 5-1.Figure 5-1: Graphical representation of an XML DOM tree.The XmlDocument class represents the entry point in the binary structure and thecentral console that lets you move through nodes, reading and writing contents. Each170
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Applied XML Programming for Microso
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services. Rainer Heller of Siemens
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IntroductionIt was about five years
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What Do I Need to Use This Book?Mos
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Part I: XML Core Classes in the .NE
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Related XML StandardsTable 1-1 list
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XMLDOM model (memory footprint and
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⋮A configuration section handler
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managed application, you must first
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Figure 1-1: Streams can be read and
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abstraction and explicitly indicate
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The XPath Query EngineXPath is a la
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Chapter 2: XML ReadersIn the Micros
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Table 2-1: Public Properties of the
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Table 2-3: Public Methods of the Xm
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Table 2-4: Types of Nodes in the Xm
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To produce these results, I created
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In particular, the XmlConvert class
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The method we create to do this is
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Consider the following attribute va
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An entity reference consists of the
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The NameTable ObjectOne of the secr
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End ClassByVal type As XmlNodeType)
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Fragments and Parser ContextThe con
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You can specify other settings for
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FullerAndrewSales ManagerLeverlingJ
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String[] m_headerValues;tokensbool
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get{if(m_readState != ReadState.Int
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}public override string this[string
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}}return false;The name of the attr
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dt.Columns.Add(col);}reader.MoveToE
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Readers and XML ReadersTo cap off o
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Chapter 3: XML Data ValidationOverv
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The XmlValidatingReader Programming
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The ValidationEventHandler EventThe
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Figure 3-1: The sample application
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document, no event is fired, but an
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valtype = "Auto.XDR";Figure 3-2 sho
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validator object for further proces
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);This method creates and adds a ne
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public XmlValidatingReader(Stream,
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XML InteroperabilityAs you can see,
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XSDs are more powerful than DTDs, a
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Compared to the DTD schema, this XD
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xmlns:z='#RowsetSchema'>This simple
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Figure 3-7: The XSD type hierarchy.
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Table 3-6: Mapping Between XSD and
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Table 3-7: Top-Level Elements for X
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The next step is to define a new sc
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Creating an XML Schema with Visual
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Figure 3-10: The graphical represen
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Open the XML readerXmlTextReader re
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Define the pattern for the contentX
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ody of the element. It is a simple
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determine the correct sequence and
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The root element can't be successfu
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Francesco Balena's Programming Visu
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}sw.Write(sb.ToString());sw.Close()
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What the XmlWriter Class Can't DoAl
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stream. Some working memory is free
Page 123 and 124: Table 4-5: Miscellaneous Writing Me
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Page 127 and 128: else you might need that the writer
Page 129 and 130: By using the pubid argument (PUBLIC
Page 131 and 132: Figure 4-3: A dynamically created X
Page 133 and 134: This command executes normally, but
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Page 143 and 144: Figure 4-8: A PictureBox control di
Page 145 and 146: NoteThe entire source code for a sa
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Page 151 and 152: Testing the XmlRecordsetWriter Clas
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Page 157 and 158: Table 4-9: Methods of the XmlTextRe
Page 159 and 160: while(rw.Read()){switch(rw.NodeType
Page 161 and 162: if (m_reader.HasAttributes){// Cons
Page 163 and 164: Figure 4-14: The code can be used t
Page 165 and 166: }}rw.Writer.WriteStartElement(rw.Re
Page 167 and 168: Note The new keyword is C#-specific
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Page 173: Part II: XML Data ManipulationChapt
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Page 181 and 182: Table 5-3: Events of the XmlDocumen
Page 183 and 184: Both XmlLinkedNode and XmlCharacter
Page 185 and 186: Figure 5-3: The XmlLinkedNode class
Page 187 and 188: Working with XML DocumentsTo be ful
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Page 193 and 194: Limitations of the XML DOM Eventing
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Page 197 and 198: If you use a namespace, you might r
Page 199 and 200: Extending the XML DOMAlthough the .
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Page 207 and 208: Chapter 6: XML Query Language and N
Page 209 and 210: Figure 6-1: A sample XML tree in wh
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Page 213 and 214: How XPointer Uses XPathAn XPointer
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Page 221 and 222: A Better Way to Select a Single Nod
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Table 6-3: Properties of the XPathN
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the type. In addition, attributes a
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As you can see, several methods hav
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Setting Namespace InformationThe in
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string strX = (string) x;string str
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the navigator's author must careful
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⋮Notice that the sample file syst
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Table 6-10: Properties of the XPath
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supplies the underlying means to id
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• XSL Formatting Objects (XSL-FO)
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HTML," on page 299. In the meantime
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Table 7-2: XSLT Instructions for Da
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Table 7-4: XSLT Instructions for La
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In the first template, the context
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……⋮The expected target schema
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By the way, note that the version a
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The XslTransform ClassNow that we'v
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To avoid threading risks, be aware
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index of the style sheet contents.
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Table 7-7: Transform Method Overloa
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XSLT Output RecordsThe output of th
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Perform the transformation, record
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method, other attributes of interes
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Table 7-8: Methods of the XsltArgum
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the object's DataSetName property.
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s:rowbaseAfter you create the node
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features than the XslTransform clas
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Don't confuse the Internet Explorer
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Supported languages are C#, Visual
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double CalculateSubTotal(XPathNodeI
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profitable, because XML is a metala
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Chapter 8: XML and DatabasesOvervie
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Framework applications. SQLXML 3.0
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......The FOR XML AUTO mode always
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Figure 8-1: The client-side XML for
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lastname AS [Employee!1!Name]This s
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sql:field="FirstName" type="xsd:str
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to instantiate a COM object, query
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}// Process elementswhile(reader.Re
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(No context information specified)X
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}...The base class is for the most
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public override void Close(){m_data
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Synchronizing with a DataSet Object
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denote insertions, deletions, and u
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schema information to associate the
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This schema first defines a relatio
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that throughout the Updategram. The
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object for XML-driven updates, an A
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Table 8-2: Properties of the SqlXml
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Table 8-4: Methods of the SqlXmlCom
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This schema addresses a layout such
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database. If all goes well, the Dat
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Chapter 9: ADO.NET XML Data Seriali
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provided way to serialize ADO.NET o
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1DavolioNancy⋮106897⋮Basically,
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The element describes the body of
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Serializing to Valid XMLAs you can
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Table 9-3: The MappingType Enumerat
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⋮This syntax is simple and effect
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By using keyref and nested types, y
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Figure 9-6: An application that pas
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{}DataTable dt = CreateTempTable(dv
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dt = (DataTable) bf.Deserialize(sr.
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more valuable, because it automatic
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Loading DataSet Objects from XMLThe
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The XML source is read one node aft
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Figure 9-10: ReadXml correctly reco
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Figure 9-12: How Microsoft Visual S
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The reader tracks the current node
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}m_currentAttributeIndex = -1;When
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persistence, resort to the DiffGram
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......The root node can have up to
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object's tables. The data written o
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different blocks. Attributes in the
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If no match is found, ReadXml deduc
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Although this solution is clearly n
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The diffgr:error attribute on the r
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{}// Url is a form property that po
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...By design, the current DiffGram
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a DiffGram. To make DiffGrams reall
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Figure 10-8: The sample save-and-re
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dv.RowStateFilter = DataViewRowStat
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in the RowError property of the cor
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however, the verbosity of XML paten
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Chapter 11: XML SerializationOvervi
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0As you can see, the class represen
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ead-only properties; does not handl
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}public Employee(){m_ID = -1;}publi
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Methods of the XmlSerializer ClassT
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ns.Add("d", "urn:dino-e-xml");ns.Ad
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When designing classes destined to
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eferenced assembly and its properti
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The preceding code creates an attri
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}public string FirstName;public str
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XML as the type dictates. The attri
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create the XmlSerializer object. Ho
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command, the data flows into the se
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XmlAttributes changesFirstName = ne
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{if (emp.Territories == null)emp.Te
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{// Import type mapping information
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As you can see, the first file crea
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A good source for learning about SO
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NoteSome programmers believe that .
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involved, you must use Web services
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handled by .NET Remoting; the user
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Figure 12-3: How .NET Remoting mars
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If you want to play with the transp
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The query involves three tables—E
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As we saw in Chapter 4, the XmlText
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{// Propertiesprotected SalesDataPr
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We'll look more closely at channels
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server only when the client calls a
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Figure 12-5: The IIS application ma
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this little requirement is enough t
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typeof(ServiceSalesProvider),"tcp:/
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}The code in boldface demonstrates
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BinaryWriter writer = new BinaryWri
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Chapter 13: XML Web ServicesOvervie
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intSOAP is not magic—it is a simp
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public class MyWebService : WebServ
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effectively exposed over the Web, a
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Format of SOAP Messages for a Web M
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The SoapRpcMethod AttributeThe RPC
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If you compare this code with the r
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Figure 13-5: Processing a Web servi
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The machine.config file is an XML f
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Namespace="xmlnet/cs/0735618011")]p
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In situations in which the URL can'
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Const TheYear = 1997' Create the HT
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implementation does make a lot of s
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Mobile code allows you to send C# o
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Chapter 14: XML on the ClientOvervi
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accessible XML parser to consume th
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The following code shows a version
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NoteIn general, you can name the ou
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To create a hidden field, you can u
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To load assemblies from directories
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{}int size = 130;this.Columns.Add(m
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private void PrepareSortedDataView(
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Figure 14-3: An ASP.NET page that c
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var parser = new ActiveXObject("Mic
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"SERVER=localhost;DATABASE=northwin
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Chapter 15: .NET Framework Applicat
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Because we're focusing on applicati
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executable, ASP.NET application or
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NoteUser applications don't need to
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The myfile.config file contains the
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Some internal variablesXmlNodeList
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scratch or inherit from an existing
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Table 15-2: Predefined Section Hand
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The interface includes a single met
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NameValueCollection coll;coll = Con
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}if (configMenu != null)AddMenuTool
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}}menuTools.MenuItems.Add(index, mn
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Implementing the DataSet Section Ha
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AfterwordOverviewWhile writing this
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not an application-specific object.
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