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

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Fragments and Parser ContextThe context for an XML parser consists of all the information that can be used tocustomize the way in which the parser works. Context information includes theencoding character set, the DTD information needed to set all the default attributes andto expand entities, the namespaces, the language, and the white space handling.If you specify the XML fragment using a StringReader object, as shown in the previoussection, all elements of the parser context are set with default values. The parsercontext is fully defined by the XmlParserContext class. When instantiating anXmlTextReader class to operate on a string, you use the following constructor andspecify a parser context:public XmlTextReader(string xmlFragment,XmlNodeType fragType,XmlParserContext context);The xmlFragment parameter contains the XML string to parse. The fragType argument,on the other hand, represents the type of fragment. It specifies the type of the node atthe root of the fragment. Only Element, Attribute, and Document nodes are permitted.The XmlParserContext constructor has a few overloads. The one with the shortest listof arguments, shown here, is probably the overload you will use most often:public XmlParserContext(XmlNameTable nt,XmlNamespaceManager nsMgr,string xmlLang,XmlSpace xmlSpace);Creating a new parser context is as easy as running the following statements:NameTable table = new NameTable();table.Add("Author");XmlNamespaceManager mgr = new XmlNamespaceManager(table);mgr.AddNamespace("company", "urn:ThisIsMyBook");XmlParserContext context;context = new XmlParserContext(table, mgr, "en-US",XmlSpace.None);The first parameter to this XmlParserContext constructor is a NameTable object. Thename table is used to look up prefixes and namespaces as atomized strings. Forperformance reasons, you also need to pass a NameTable object—which inherits fromthe abstract XmlNameTable class—when creating a new instance of a namespacemanager class.NoteIf the namespace manager and the parser context happen to usedifferent NameTable objects, the XmlParserContext might not beable to recognize the namespaces brought in by the manager,resulting in an XML exception.43
The second parameter to the XmlParserContext constructor is anXmlNamespaceManager object. The XmlNamespaceManager class is a type ofcollection class designed to contain and manage namespace information. It providesmethods to add, remove, and search for namespaces. Namespaces are stored withtheir prefix and URN, which are passed to it through the AddNamespace method. If theprefix is an empty string, the namespace is considered to be the default.The XmlParserContext class makes use of a namespace manager to collect all thenamespaces that the fragment might use. A fragment is simply a small piece of XMLcode and, as such, is not expected to contain all namespace definitions that its nodesand attributes might use.When a namespace manager is created, the class constructor automatically adds acouple of frequently used prefixes. These prefixes are listed in Table 2-5.Table 2-5: Standard Namespace Prefixes Added to XmlNamespaceManagerPrefixxmlnsxml44Corresponding Namespacehttp://www.w3.org/2000/xmlnshttp://www.w3.org/1998/namespaceA third namespace prefix that is allowed is the empty string, which of course has nocorresponding namespace URN. Thanks to this contrivance, you don't need to create anamespace manager instance to parse XML fragments unless nodes and attributesreally contain custom namespaces. Added namespaces are not verified as conformingto the W3C Namespaces specification and are discarded if they do not conform.As mentioned in the section "The NameTable Object," on page 49, the namespacenames are atomized and placed in the related NameTable object as soon as they areadded to the collection. When you call the XML reader's LookupNamespace method tosearch for the namespace that matches the specified prefix, the prefix string isatomized and added to the name table for additional, faster use.Any namespace declaration has a clear and well-defined scope. The namespacedeclaration can appear anywhere in the document, not just at the very beginning of it.The place in the source where the declaration appears determines the scope. Anamespace controls all the XML elements rooted in the node in which it appears. In thefollowing example, the namespace is applied to the node and all of itsdescendants:⋮DinoEsposito99⋮The namespace defined for the element does not apply to elements outsidethat element. The namespace is effective from its point of declaration until the end ofthe element. After that, any other node not qualified with a namespace prefix isassumed to belong to whichever default namespace has been declared in thedocument.
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 38 and 39: The method we create to do this is
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 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
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
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The next step is to define a new sc
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Creating an XML Schema with Visual
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Figure 3-10: The graphical represen
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Open the XML readerXmlTextReader re
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Define the pattern for the contentX
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ody of the element. It is a simple
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determine the correct sequence and
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The root element can't be successfu
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Francesco Balena's Programming Visu
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}sw.Write(sb.ToString());sw.Close()
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What the XmlWriter Class Can't DoAl
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stream. Some working memory is free
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Table 4-5: Miscellaneous Writing Me
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If you want to get just the default
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else you might need that the writer
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By using the pubid argument (PUBLIC
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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
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Table 4-8: Public Methods of the Xm
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}Writer.WriteStartElement("xml");Wr
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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
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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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