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

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If specified, the encoding is written in the XML declaration and used by Save to createthe actual output stream. If the encoding is null or empty, no encoding attribute is set,and the default Unicode Universal Character Set Transformation Format, 8-bit form(UTF-8) encoding is used.CreateXmlDeclaration returns an XmlDeclaration node that you add as a child to theXmlDocument class. CreateComment, on the other hand, creates an XmlCommentnode that represents an XML comment, as shown here:Element nodes are created using the CreateElement method. The node is firstconfigured with all of its expected child nodes and then added to the document, asshown here:XmlNode root = doc.CreateElement("folders");For the purposes of this example, we need a way to access all the subdirectories of agiven folder. In the .NET Framework, this kind of functionality is provided by theDirectoryInfo class in the System.IO namespace:DirectoryInfo dir = new DirectoryInfo(path);To scan the subdirectories of the given path, you arrange a loop on top of the array ofDirectoryInfo objects returned by the GetDirectories method, as follows:foreach (DirectoryInfo d in dir.GetDirectories()){n = doc.CreateElement("folder");//// Create attributes for the node//// Set the text for the noden.InnerText = "Content of "+ d.Name;}// Append the node to the rest of the documentroot.AppendChild(n);In the loop, you create any needed node, configure the node with attributes andtext, and then append the node to the parent node.When creating an element node using the CreateElement method, you can specify anamespace URI as well as a namespace prefix. With the following code, you add anxmlns attribute to the node declaration:XmlNode root = doc.CreateElement("folders", "urn:dino-e");The final result is shown here:191
If you use a namespace, you might reasonably want to use a prefix too. To specify anamespace prefix, resort to another overload for the CreateElement method in whichyou pass in the order, the prefix, the local name of the element, and the namespaceURI, as shown here:XmlNode root = doc.CreateElement("d", "folders", "urn:dino-e");The node XML code changes to this:At this point, to also qualify the successive nodes with this namespace, callCreateElement with the prefix and the URI, as shown here:n = doc.CreateElement("d", "folder", "urn:dino-e");NoteBear in mind that although all the CreateXXX methods available inthe XmlDocument class can create an XML node, that node is notautomatically added to the XML DOM. You must do that explicitlyusing one of the several methods defined to extend the currentDOM.Appending AttributesAn attribute is simply a special type of node that you create using the CreateAttributemethod. The method returns an XmlAttribute object. The following code shows how tocreate a new attribute named path and how to associate it with a parent node:XmlAttribute a;a = doc.CreateAttribute("path");a.Value = path;node.Attributes.SetNamedItem(a);Like CreateElement, CreateAttribute too allows you to qualify the name of the attributeusing a namespace URI and optionally a prefix. The overloads for both methods havethe same signature.You set the value of an attribute using the Value property. At this point, however, theattribute node is not yet bound to an element node. To associate the attribute with anode, you must add the attribute to the node's Attributes collection. The SetNamedItemmethod does this for you. The following code shows the finalized version of the loopthat creates the XML file for our example:foreach (DirectoryInfo d in dir.GetDirectories()){n = doc.CreateElement("folder");a = doc.CreateAttribute("name");a.Value = d.Name;n.Attributes.SetNamedItem(a);a = doc.CreateAttribute("created");a.Value = d.CreationTime.ToString();n.Attributes.SetNamedItem(a);192
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Applied XML Programming for Microso
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services. Rainer Heller of Siemens
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IntroductionIt was about five years
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What Do I Need to Use This Book?Mos
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Part I: XML Core Classes in the .NE
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Related XML StandardsTable 1-1 list
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XMLDOM model (memory footprint and
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⋮A configuration section handler
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managed application, you must first
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Figure 1-1: Streams can be read and
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abstraction and explicitly indicate
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The XPath Query EngineXPath is a la
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Chapter 2: XML ReadersIn the Micros
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Table 2-1: Public Properties of the
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Table 2-3: Public Methods of the Xm
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Table 2-4: Types of Nodes in the Xm
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To produce these results, I created
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In particular, the XmlConvert class
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The method we create to do this is
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Consider the following attribute va
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An entity reference consists of the
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The NameTable ObjectOne of the secr
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End ClassByVal type As XmlNodeType)
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Fragments and Parser ContextThe con
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You can specify other settings for
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FullerAndrewSales ManagerLeverlingJ
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String[] m_headerValues;tokensbool
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get{if(m_readState != ReadState.Int
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}public override string this[string
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}}return false;The name of the attr
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dt.Columns.Add(col);}reader.MoveToE
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Readers and XML ReadersTo cap off o
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Chapter 3: XML Data ValidationOverv
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The XmlValidatingReader Programming
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The ValidationEventHandler EventThe
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Figure 3-1: The sample application
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document, no event is fired, but an
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valtype = "Auto.XDR";Figure 3-2 sho
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validator object for further proces
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);This method creates and adds a ne
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public XmlValidatingReader(Stream,
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XML InteroperabilityAs you can see,
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XSDs are more powerful than DTDs, a
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Compared to the DTD schema, this XD
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xmlns:z='#RowsetSchema'>This simple
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Figure 3-7: The XSD type hierarchy.
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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
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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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Page 151 and 152: Testing the XmlRecordsetWriter Clas
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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
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Page 181 and 182: Table 5-3: Events of the XmlDocumen
Page 183 and 184: Both XmlLinkedNode and XmlCharacter
Page 185 and 186: Figure 5-3: The XmlLinkedNode class
Page 187 and 188: Working with XML DocumentsTo be ful
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Page 191 and 192: While the secondary thread works, t
Page 193 and 194: Limitations of the XML DOM Eventing
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Page 199 and 200: Extending the XML DOMAlthough the .
Page 201 and 202: Table 5-6: Programming Interface of
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Page 205 and 206: Figure 5-7: The sample application
Page 207 and 208: Chapter 6: XML Query Language and N
Page 209 and 210: Figure 6-1: A sample XML tree in wh
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Page 213 and 214: How XPointer Uses XPathAn XPointer
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Page 219 and 220: Figure 6-4: The node set returned b
Page 221 and 222: A Better Way to Select a Single Nod
Page 223 and 224: 3. Optionally, precompile the XPath
Page 225 and 226: Table 6-3: Properties of the XPathN
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Page 229 and 230: As you can see, several methods hav
Page 231 and 232: Setting Namespace InformationThe in
Page 233 and 234: string strX = (string) x;string str
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Page 237 and 238: ⋮Notice that the sample file syst
Page 239 and 240: Table 6-10: Properties of the XPath
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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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