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

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Write a node. Since the URN associated with// the prefix does not match the specified URN, a new prefix/URN// binding is generated rooting in the new node.writer.WriteStartElement(prefix, "value","despos:isbn-0735618011");writer.WriteString("...");writer.WriteEndElement();The two nodes created look like the XML source code shown here:......The two nodes are scoped in different namespaces although they have thesame name and even the same namespace prefix.Qualified AttributesTo write qualified attributes, you use some of the overloads of the WriteAttributeStringand WriteStartAttribute methods. According to the W3C XML 1.0 and Namespacesspecifications, element nodes can have an associated namespace without a prefix, asshown here:...This namespace can be obtained with the following code:writer.WriteStartElement("value", "despos:isbn-0735618011");writer.WriteString("...");writer.WriteEndElement();Attributes, on the other hand, can't do without a prefix once they are bound to anamespace. If you don't indicate the prefix explicitly, one is generated automatically.Try the following code:writer.WriteStartElement("element");writer.WriteStartAttribute("value", "despos:isbn-0735618011");writer.WriteString(s);writer.WriteEndAttribute();writer.WriteEndElement();The value attribute is associated with a namespace URN, but no prefix is set orretrieved through LookupPrefix. The resultant XML text is shown here:An automatic prefix is generated to scope the attribute. There are two elements in the.NET Framework–generated prefix: the depth level, d{n}, and the prefix index, p{n}. Thedepth level is a one-based value that counts the depth of the node in the XML tree. Theprefix index counts the number of namespaces defined in the body of the node. Forexample, consider the following code:writer.WriteStartElement("parent");131
writer.WriteStartElement("element");// First attributewriter.WriteStartAttribute("value", "despos:isbn-0735618011");writer.WriteString("...");writer.WriteEndAttribute();// Second attributewriter.WriteAttributeString("value", "urn:my-namespace", "...");writer.WriteEndElement();writer.WriteEndElement();The corresponding output that the XmlTextWriter class generates is shown in thefollowing code. Notice the presence of an extra parent node.As you can see, the depth increased by 1 due to the extra parent node. In addition, theprefix index ranges from 1 to 2 to include all the namespaces in the node.Getting the Qualified NameThe methods described up to now only allow you to create element and attribute nodeswith fully qualified names. WriteQualifiedName is a method you can use to write outboth element and attribute namespace-qualified names.The WriteQualifiedName method takes two arguments, one for the node name and onefor the namespace URN. Next it looks for the prefix associated with that URN andoutputs the combined name in the form prefix:name. If you are writing element content,you get an exception if the namespace declaration does not exist. If the namespaceargument maps to the current default namespace, the method generates no prefix. Forattributes, if the specified namespace is not found, it is automatically registered and arelated prefix is created as described in the previous section.The WriteQualifiedName method, however, simply returns the name of the node andcan't be used to create the node itself. From this point of view, it is only complementaryto methods like WriteStartElement and WriteStartAttribute. You need this method onlywhen you have to write out the name of a node. When the writer is configured tosupport namespaces (which is the default), the WriteQualifiedName method alsoensures that the output name conforms to the W3C Namespaces recommendation asdefined in the XML 1.0 specification. You can turn namespace support on and off in awriter by setting the Namespaces property with a Boolean value as appropriate.TipAs the W3C XML Namespaces specification recommends, the prefixshould be considered only as a placeholder for a namespace URN.Although you could use prefixes and real names interchangeablywithin the range of a document, bear in mind that an intensive use ofprefixes can soon become misleading when the document must beaccessed by different applications and when you use the same prefix132
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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,
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 and 108: Define the pattern for the contentX
Page 109 and 110: ody of the element. It is a simple
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: "dinoe:isbn-0735618011");This code
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 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
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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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