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

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Figure 3-12: The XmlSchemaObject class and some of its descendants.The Items collection picks up all the top-level elements found below the root node. All elements that can be safely cast to XmlSchemaComplexTypehave their Name property checked against the requested type, as shown here:XmlSchemaComplexType GetComplexType(XmlSchema schema, stringtypeName){XmlSchemaComplexType ct;foreach(XmlSchemaObject o in schema.Items){if (o is XmlSchemaComplexType){ct = (XmlSchemaComplexType) o;if (ct.Name == typeName)return ct;}}}return null;Once a reference to the complex type has been found, the code proceeds by creatingthe new schema element. The relative type is declared in-line in the103
ody of the element. It is a simple type defined as a restriction of the primitive XSDstring type. When you define an XSD simple type by restriction you apply some facetsto it. A facet is a property that narrows the set of values allowed for that element. Forexample, length, minInclusive, and maxInclusive are all facets that respectivelydetermine the length of the type and the range of accepted values. Each facet definedin the XML Schema 1.0 specification has a corresponding class in the .NET SOM.The element must fulfill a number of requirements. It has to be anuppercase string with a fixed length (2 characters). The pattern facet available in theXML Schema specification supports regular expressions to control the contents of anelement at the finest level. The following code sets the uppercase and fixed-lengthconstraints. (For more information about regular expressions, refer to the section"Further Reading," on page 133.)XmlSchemaPatternFacet provPattern = new XmlSchemaPatternFacet();provPattern.Value = "[A-Z]{2}";provinceRestriction.Facets.Add(provPattern);After the new element has been defined and given a type, you add it to the sequence ofelements that form the type you want to extend. In this case, the element must become the next element in the compositor of theAddressType type. The programming interface of a complex type lets you access thesequence component through the Particle property, as shown here:XmlSchemaSequence seq = (XmlSchemaSequence) ct.Particle;seq.Items.Add(provElem);At this point, the editing phase approaches an end. The new schema is now complete;all that remains is to save it to a disk file. The code discussed up to now, when appliedto the address.xsd file, produces the following schema:104
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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
Page 58 and 59: }public override string this[string
Page 60 and 61: }}return false;The name of the attr
Page 62 and 63: dt.Columns.Add(col);}reader.MoveToE
Page 64 and 65: Readers and XML ReadersTo cap off o
Page 66 and 67: Chapter 3: XML Data ValidationOverv
Page 68 and 69: The XmlValidatingReader Programming
Page 70 and 71: The ValidationEventHandler EventThe
Page 72 and 73: Figure 3-1: The sample application
Page 74 and 75: document, no event is fired, but an
Page 76 and 77: valtype = "Auto.XDR";Figure 3-2 sho
Page 78 and 79: validator object for further proces
Page 80 and 81: );This method creates and adds a ne
Page 82 and 83: public XmlValidatingReader(Stream,
Page 84 and 85: XML InteroperabilityAs you can see,
Page 86 and 87: XSDs are more powerful than DTDs, a
Page 88 and 89: Compared to the DTD schema, this XD
Page 90 and 91: xmlns:z='#RowsetSchema'>This simple
Page 93 and 94: 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: Define the pattern for the contentX
Page 111 and 112: determine the correct sequence and
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 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
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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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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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