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

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Data-Reduced (XDR) schemas (see Chapter 3) and a few specific namespaces. Inaddition, it makes use of the XDR type system, which has no direct correspondencewith the .NET Framework type system. But one thing at a time. Let's start with the newXmlRecordsetWriter class.The XmlRecordsetWriter Programming InterfaceThe XmlRecordsetWriter class embeds an instance of the XmlTextWriter class but doesnot inherit from it. All the hard work of creating the XML output is accomplished throughthe internal writer, but the class programming interface is completely customized andlargely simplified.By design, the set of constructors of the XmlRecordsetWriter class is nearly identical tothe constructors of the XmlTextWriter class, as shown here:protected XmlTextWriter Writer;public XmlRecordsetWriter(string filename){Writer = new XmlTextWriter(filename, null);SetupWriter();}public XmlRecordsetWriter(Stream s){Writer = new XmlTextWriter(s, null);SetupWriter();}public XmlRecordsetWriter(TextWriter tw){Writer = new XmlTextWriter(tw);SetupWriter();}The only difference is that the XmlRecordsetWriter constructors do not support anencoding character set. The parameter for encoding is always set to null.Table 4-8 lists the methods exposed by the XmlRecordsetWriter class.Table 4-8: Public Methods of the XmlRecordsetWriter ClassMethodWriteContentWriteEndDocumentWriteRecordsetWriteSchemaDescriptionLoops on the specified ADO.NET source object andwrites a row of data. This method features overloadsto read from DataSet, DataTable, and DataViewobjects.Ensures that all the pending nodes are closed andreleases the underlying writer and stream.One-shot method that groups together all the stepsnecessary to create an XML recordset file. Thismethod features overloads to read from DataSet,DataTable, and DataView objects.Writes the schema information according to the XDRsyntax and reads column metadata from ADO.NET141
Table 4-8: Public Methods of the XmlRecordsetWriter ClassMethodWriteStartDocumentDescriptionobjects. This method features overloads to read fromDataSet, DataTable, and DataView objects.Writes the document's prolog, including the rootnode with all the needed namespace declarations.For writing schemas and content, the XmlRecordsetWriter class needs to readinformation out of some ADO.NET objects. For this reason, methods like WriteSchema,WriteContent, and WriteRecordset have the following four overloads:public void WriteXXX(DataSet ds){WriteXXX(ds.Tables[0]);}public void WriteXXX(DataSet ds, string tableName){WriteXXX(ds.Tables[tableName]);}public void WriteXXX(DataView dv){WriteXXX(dv.Table);}public void WriteXXX(DataTable dt){// Actual implementation here}The node layout of an ADO Recordset object is shown in Figure 4-10.142
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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.
Page 95 and 96: Table 3-6: Mapping Between XSD and
Page 97 and 98: Table 3-7: Top-Level Elements for X
Page 99 and 100: The next step is to define a new sc
Page 101 and 102: Creating an XML Schema with Visual
Page 103 and 104: Figure 3-10: The graphical represen
Page 105 and 106: Open the XML readerXmlTextReader re
Page 107 and 108: Define the pattern for the contentX
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Page 113 and 114: The root element can't be successfu
Page 115 and 116: Francesco Balena's Programming Visu
Page 117 and 118: }sw.Write(sb.ToString());sw.Close()
Page 119 and 120: What the XmlWriter Class Can't DoAl
Page 121 and 122: stream. Some working memory is free
Page 123 and 124: Table 4-5: Miscellaneous Writing Me
Page 125 and 126: If you want to get just the default
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
Page 135 and 136: "dinoe:isbn-0735618011");This code
Page 137 and 138: writer.WriteStartElement("element")
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: NoteThe entire source code for a sa
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 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 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
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If you use a namespace, you might r
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Extending the XML DOMAlthough the .
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Table 5-6: Programming Interface of
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file changes, irrespective of the c
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Figure 5-7: The sample application
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Chapter 6: XML Query Language and N
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Figure 6-1: A sample XML tree in wh
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with the forward slash (/). The fol
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How XPointer Uses XPathAn XPointer
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the caller. Using SelectSingleNode
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StringBuilder sb = new StringBuilde
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Figure 6-4: The node set returned b
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A Better Way to Select a Single Nod
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3. Optionally, precompile the XPath
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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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