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

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The method we create to do this is the user-defined function GetAttributeList.GetAttributeList takes a reference to the reader and extracts attribute values for thecurrently selected node.// Assume we call this method after having read the nodestring GetAttributeList(XmlReader reader){String buf = "";if (reader.HasAttributes)while(reader.MoveToNextAttribute())buf += reader.Name + "=\""+ reader.Value + "\" ";}reader.MoveToElement();return buf;When the pointer is not already positioned on an attribute node, callingMoveToNextAttribute is equivalent to calling MoveToFirstAttribute, which moves thepointer to the first attribute node.An XML reader can move only forward, which means that no previously visited nodecan be revisited once you have moved on to another node. This rule has a very specificexception. When the pointer is positioned on an attribute node, you can move back tothe parent node using the MoveToElement method. This exception exists because,after all, an attribute is a particular type of node that is used to qualify the contents ofthe parent. From this point of view, an attribute is seen as a sort of subnode, andmoving between the attributes of a given node does not logically change the index ofthe current element node. Using MoveToAttribute and MoveToFirstAttribute, you canjump from one attribute node to the next in both directions.Parsing Mixed-Content AttributesNormally, the content of an attribute consists of a simple string of text. If you need touse it as an instance of a more specific type (for example, a date or a Boolean value),you can convert the string using either the methods of the static classes XmlConvert(recommended) or even System.Convert.In some situations, however, the content of an attribute is mixed and includes plain textalong with entities. Although unable to resolve entity references, the XmlTextReaderclass can separate text from entities when both are embedded in an attribute's value.For this to happen, you must parse the attribute's content using the ReadAttributeValuemethod instead of simply reading the content via the Value property.The following code demonstrates how to rewrite the GetAttributeList function so that itcan preprocess mixed attributes and separate text from entities. The added code isshown in boldface.// Assume we call this method after having read the nodestring GetAttAttributeList(XmlReader reader){String buf = "";if (reader.HasAttributes)while(reader.MoveToNextAttribute()){33
}buf += reader.Name + "=\"";while(reader.ReadAttributeValue()){if (reader.NodeType == XmlNodeType.EntityReference)buf += "["+ reader.Name + "]";elsebuf += reader.Value;}buf += "\" ";}reader.MoveToElement();return buf;The ReadAttributeValue method parses the attribute value and isolates eachconstituent token, be it plain text or an entity. The function calls ReadAttributeValuerepeatedly until the end of the attribute string is reached. Because by design theXmlTextReader parser does not resolve entities, there is not much you can do with theembedded entity other than recognizing and maybe skipping it. The preceding code, forinstance, wraps the name of the entity in square brackets. When processing an elementnode such as this:the GetAttAttributeList function produces the following string:ISBN="61801-1" author="[author], Italy"Attribute NormalizationThe W3C XML 1.0 Recommendation defines attribute normalization as the preliminaryprocess that an attribute value should be subjected to prior to being returned to theapplication. The normalization process can be summarized in a few basic rules:• Any referenced character (for example, ) is expanded.• Any white space character (blanks, carriage returns, linefeeds, and tabs)is replaced with a blank (ASCII 0x20) character.• Any leading or trailing sequence of blanks is discarded.• Any other sequence of blanks is replaced with a single blank character(ASCII 0x20).All other characters (for example, the literals forming the value) are simply appended tothe resulting normalized value. Any entity reference found in the attribute value isrecursively normalized. Of course, the normalization process applies only to theattributes defined outside of any CDATA section.The XmlTextReader parser lets you toggle the normalization process on and offthrough the Normalization Boolean property. By default, the Normalization property isset to false, meaning that attribute values are not normalized. If the normalizationprocess is disabled, an attribute can contain any character, including characters in the to range, which are normally considered invalid and not permitted. Whennormalization is on, using any of those character entities results in an XmlExceptionbeing thrown.34
Page 2 and 3: Applied XML Programming for Microso
Page 4 and 5: services. Rainer Heller of Siemens
Page 6 and 7: IntroductionIt was about five years
Page 8 and 9: What Do I Need to Use This Book?Mos
Page 10 and 11: Part I: XML Core Classes in the .NE
Page 12 and 13: Related XML StandardsTable 1-1 list
Page 14 and 15: XMLDOM model (memory footprint and
Page 16 and 17: ⋮A configuration section handler
Page 18 and 19: managed application, you must first
Page 20 and 21: Figure 1-1: Streams can be read and
Page 22 and 23: abstraction and explicitly indicate
Page 24 and 25: The XPath Query EngineXPath is a la
Page 26 and 27: Chapter 2: XML ReadersIn the Micros
Page 28 and 29: Table 2-1: Public Properties of the
Page 30 and 31: Table 2-3: Public Methods of the Xm
Page 32 and 33: Table 2-4: Types of Nodes in the Xm
Page 34 and 35: To produce these results, I created
Page 36 and 37: In particular, the XmlConvert class
Page 40 and 41: Consider the following attribute va
Page 42 and 43: An entity reference consists of the
Page 44 and 45: The NameTable ObjectOne of the secr
Page 46 and 47: End ClassByVal type As XmlNodeType)
Page 48 and 49: Fragments and Parser ContextThe con
Page 50 and 51: You can specify other settings for
Page 52 and 53: FullerAndrewSales ManagerLeverlingJ
Page 54 and 55: String[] m_headerValues;tokensbool
Page 56 and 57: 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
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xmlns:z='#RowsetSchema'>This simple
Page 93 and 94:
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
Page 111 and 112:
determine the correct sequence and
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The root element can't be successfu
Page 115 and 116:
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
Page 125 and 126:
If you want to get just the default
Page 127 and 128:
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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This command executes normally, but
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"dinoe:isbn-0735618011");This code
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writer.WriteStartElement("element")
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}writer.WriteEndDocument();writer.C
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}}reader.Close();If in this code yo
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Figure 4-8: A PictureBox control di
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NoteThe entire source code for a sa
Page 147 and 148:
Table 4-8: Public Methods of the Xm
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}Writer.WriteStartElement("xml");Wr
Page 151 and 152:
Testing the XmlRecordsetWriter Clas
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Framework type and map each to an e
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}if (i % 2)writer.WriteNode(reader,
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Table 4-9: Methods of the XmlTextRe
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while(rw.Read()){switch(rw.NodeType
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if (m_reader.HasAttributes){// Cons
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Figure 4-14: The code can be used t
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}}rw.Writer.WriteStartElement(rw.Re
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Note The new keyword is C#-specific
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}The net effect of this code is tha
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.NET XML writers only ensure the we
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Part II: XML Data ManipulationChapt
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3JanetLeverlingWhen processed by an
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child elements when processing an X
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through the base class XmlNode. (Se
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Table 5-3: Events of the XmlDocumen
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Both XmlLinkedNode and XmlCharacter
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Figure 5-3: The XmlLinkedNode class
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Working with XML DocumentsTo be ful
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}}{if (n.NodeType == XmlNodeType.El
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While the secondary thread works, t
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Limitations of the XML DOM Eventing
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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
Page 259 and 260:
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
Page 301 and 302:
}// 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
Page 313 and 314:
schema information to associate the
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This schema first defines a relatio
Page 317 and 318:
that throughout the Updategram. The
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object for XML-driven updates, an A
Page 321 and 322:
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
Page 339 and 340:
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
Page 361 and 362:
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
Page 369 and 370:
object's tables. The data written o
Page 371 and 372:
different blocks. Attributes in the
Page 373 and 374:
If no match is found, ReadXml deduc
Page 375 and 376:
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
Page 381 and 382:
...By design, the current DiffGram
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a DiffGram. To make DiffGrams reall
Page 385 and 386:
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
Page 393 and 394:
Chapter 11: XML SerializationOvervi
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0As you can see, the class represen
Page 397 and 398:
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 .
Page 431 and 432:
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
Page 463 and 464:
public class MyWebService : WebServ
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effectively exposed over the Web, a
Page 467 and 468:
Format of SOAP Messages for a Web M
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The SoapRpcMethod AttributeThe RPC
Page 471 and 472:
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
Page 485 and 486:
Mobile code allows you to send C# o
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Chapter 14: XML on the ClientOvervi
Page 489 and 490:
accessible XML parser to consume th
Page 491 and 492:
The following code shows a version
Page 493 and 494:
NoteIn general, you can name the ou
Page 495 and 496:
To create a hidden field, you can u
Page 497 and 498:
To load assemblies from directories
Page 499 and 500:
{}int size = 130;this.Columns.Add(m
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private void PrepareSortedDataView(
Page 503 and 504:
Figure 14-3: An ASP.NET page that c
Page 505 and 506:
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
Page 513 and 514:
executable, ASP.NET application or
Page 515 and 516:
NoteUser applications don't need to
Page 517 and 518:
The myfile.config file contains the
Page 519 and 520:
Some internal variablesXmlNodeList
Page 521 and 522:
scratch or inherit from an existing
Page 523 and 524:
Table 15-2: Predefined Section Hand
Page 525 and 526:
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
Page 533 and 534:
Implementing the DataSet Section Ha
Page 535 and 536:
AfterwordOverviewWhile writing this
Page 537:
not an application-specific object.
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