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

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Figure 5-2: Graphical representation of the hierarchy of node classes and theirrelationships in the .NET Framework.177
Both XmlLinkedNode and XmlCharacterData are abstract classes that provide basicfunctionality for more specialized types of nodes. Linked nodes are nodes that youmight find as constituent elements of an XML document just linked to a preceding or afollowing node. Character data nodes, on the other hand, are nodes that contain andmanipulate only text.Properties of the XmlNode ClassTable 5-4 lists the properties of the XmlNode class that derived classes can override ifnecessary. For example, not all node types support attributes and not all have childnodes or siblings. For situations such as this, the overridden properties can simplyreturn null or the empty string. By design, all node types must provide a concreteimplementation for each property.Table 5-4: Properties of the XmlNode ClassPropertyAttributesBaseURIChildNodesFirstChildHasChildNodesInnerTextInnerXmlIsReadOnlyItemLastChildDescriptionReturns a collection containing the attributes of thecurrent node. The collection is of typeXmlAttributeCollection.Gets the base URI of the current node.Returns an enumerable list object that allows you toaccess all the children of the current node. The objectreturned derives from the base class XmlNodeList,which is a linked list connecting all the nodes with thesame parent and the same depth level (siblings). Noinformation is cached (not even the objects count), andany changes to the nodes are detected in real time.Returns the first child of the current node or null. Theorder of child nodes reflects the order in which theyhave been added. In turn, the insertion order reflects thevisiting algorithm implemented by the reader. (SeeChapter 2.)Indicates whether the current node has children.Gets or sets the text of the current node and all itschildren. Setting this property replaces all the childrenwith the contents of the given string. If the stringcontains markup, the text will be escaped first.Gets or sets the markup representing the body of thecurrent node. The contents of the node is replaced withthe contents of the given string. Any markup text will beparsed and resulting nodes inserted.Indicates whether the current node is read-only.Indexer property that gets the child element node withthe specified (qualified) name.Gets the last child of the current node. Again, whichnode is the last one depends ultimately on the visitingalgorithm implemented by the reader. Normally, it is thelast child node in the source document.178
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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
Page 131 and 132: Figure 4-3: A dynamically created X
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Page 135 and 136: "dinoe:isbn-0735618011");This code
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Page 139 and 140: }writer.WriteEndDocument();writer.C
Page 141 and 142: }}reader.Close();If in this code yo
Page 143 and 144: Figure 4-8: A PictureBox control di
Page 145 and 146: NoteThe entire source code for a sa
Page 147 and 148: Table 4-8: Public Methods of the Xm
Page 149 and 150: }Writer.WriteStartElement("xml");Wr
Page 151 and 152: Testing the XmlRecordsetWriter Clas
Page 153 and 154: Framework type and map each to an e
Page 155 and 156: }if (i % 2)writer.WriteNode(reader,
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
Page 169 and 170: }The net effect of this code is tha
Page 171 and 172: .NET XML writers only ensure the we
Page 173 and 174: Part II: XML Data ManipulationChapt
Page 175 and 176: 3JanetLeverlingWhen processed by an
Page 177 and 178: child elements when processing an X
Page 179 and 180: through the base class XmlNode. (Se
Page 181: Table 5-3: Events of the XmlDocumen
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 191 and 192: While the secondary thread works, t
Page 193 and 194: Limitations of the XML DOM Eventing
Page 195 and 196: XML document is often overkill unle
Page 197 and 198: If you use a namespace, you might r
Page 199 and 200: Extending the XML DOMAlthough the .
Page 201 and 202: Table 5-6: Programming Interface of
Page 203 and 204: file changes, irrespective of the c
Page 205 and 206: Figure 5-7: The sample application
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 217 and 218: StringBuilder sb = new StringBuilde
Page 219 and 220: Figure 6-4: The node set returned b
Page 221 and 222: A Better Way to Select a Single Nod
Page 223 and 224: 3. Optionally, precompile the XPath
Page 225 and 226: Table 6-3: Properties of the XPathN
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Page 229 and 230: As you can see, several methods hav
Page 231 and 232: 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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