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

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Table 7-1: XSLT Instructions for TemplatesInstructionDescriptiontemplates to the elements thatmatch the XPath description.The select attribute selects thetarget elements. In general, asingle element can be affectedby multiple templates.Executes the specified template.The name attribute indicates thename of the previously declaredtemplate to execute.Defines a formal argument for anamed template. The nameattribute indicates the name ofthe argument. The parametercan have a default argument.You specify a default value usingeither an XPath expression (viathe select attribute) or a templateas the body of the element.Defines an actual parameter fora template call. The nameattribute indicates the matchingparameter. The actual value canbe expressed using either anXPath expression (via the selectattribute) or the body of theelement.When you set the select attribute, the template (or the parameter) will execute in thecontext of the selected nodes. Any further XPath expression to locate the text of aparticular node or attribute must be based in that context.Data Manipulation InstructionsThe commands listed in Table 7-2 are helpful for extracting data out of source nodesand then preprocessing it using in-place code.Table 7-2: XSLT Instructions for Data ManipulationInstructionDescription Returns the value of thespecified attribute or the textassociated with the given node.You select nodes using XPathexpressions. Of course,attributes must be prefixed withan at sign (@). This commandworks more or less as a macrothat expands at run time.Returns the entire node-set thatcorresponds to the results of241
Table 7-2: XSLT Instructions for Data ManipulationInstructionFuncName()Descriptionthe specified XPath expression.Specifies sort criteria for thenode-set being processed by or instructions. In thiscase, you use the selectkeyword to indicate the sort keyand data-type for the type ofsorting (text or number). Theorder attribute indicates thedirection, and case-orderdesignates which case comesfirst in the sort.Evaluates a user-definedfunction and returns the output.The function can access theunderlying XML DocumentObject Model (XML DOM)using the this keyword as theentry point to the document rootnode. The tag is aMicrosoft extension to the XSLimplementation.Each XSLT implementation supports a different set of languages for writing userdefinedfunctions. For example, Microsoft's XML Core Services (MSXML) supports onlyMicrosoft Visual Basic, Scripting Edition (VBScript) and JScript. The .NET Frameworktransformation classes, on the other hand, include support for C# and Microsoft VisualBasic .NET. (More on this later.)NoteThe syntax shown for the XSLT instructions is largely incomplete. Ilimited the descriptions to the most important and most frequentlyused attributes. More attributes are actually available; you can findthem documented and explained in the MSDN documentation aswell as in the resources listed in the section "Further Reading," onpage 343.Control Flow InstructionsThe XSLT vocabulary includes some tags that represents control flow statements suchas conditional and iterative statements. Table 7-3 summarizes the most importantcommands.Table 7-3: XSLT Instructions for Control FlowInstructionDescriptionApplies the rules in the body to eachelement that matches the givenXPath expression. The node-set canbe sorted by putting an inthe body.242
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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
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Table 4-5: Miscellaneous Writing Me
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If you want to get just the default
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else you might need that the writer
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By using the pubid argument (PUBLIC
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Figure 4-3: A dynamically created X
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This command executes normally, but
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"dinoe:isbn-0735618011");This code
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writer.WriteStartElement("element")
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}writer.WriteEndDocument();writer.C
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}}reader.Close();If in this code yo
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Figure 4-8: A PictureBox control di
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NoteThe entire source code for a sa
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Table 4-8: Public Methods of the Xm
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}Writer.WriteStartElement("xml");Wr
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Testing the XmlRecordsetWriter Clas
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Framework type and map each to an e
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}if (i % 2)writer.WriteNode(reader,
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Table 4-9: Methods of the XmlTextRe
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while(rw.Read()){switch(rw.NodeType
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if (m_reader.HasAttributes){// Cons
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Figure 4-14: The code can be used t
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}}rw.Writer.WriteStartElement(rw.Re
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Note The new keyword is C#-specific
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}The net effect of this code is tha
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.NET XML writers only ensure the we
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Part II: XML Data ManipulationChapt
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3JanetLeverlingWhen processed by an
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child elements when processing an X
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through the base class XmlNode. (Se
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Table 5-3: Events of the XmlDocumen
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Both XmlLinkedNode and XmlCharacter
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Figure 5-3: The XmlLinkedNode class
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Working with XML DocumentsTo be ful
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}}{if (n.NodeType == XmlNodeType.El
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While the secondary thread works, t
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Limitations of the XML DOM Eventing
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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 219 and 220: Figure 6-4: The node set returned b
Page 221 and 222: A Better Way to Select a Single Nod
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Page 231 and 232: Setting Namespace InformationThe in
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Page 245: HTML," on page 299. In the meantime
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Page 251 and 252: In the first template, the context
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Page 257 and 258: The XslTransform ClassNow that we'v
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Page 265 and 266: XSLT Output RecordsThe output of th
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Page 281 and 282: Supported languages are C#, Visual
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Page 285 and 286: profitable, because XML is a metala
Page 287 and 288: Chapter 8: XML and DatabasesOvervie
Page 289 and 290: Framework applications. SQLXML 3.0
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Page 293 and 294: Figure 8-1: The client-side XML for
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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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