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

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The SalesReportService.asmx file is located in the same virtual folder as the remoteobject. The following code shows the implementation of the Sales Report Web service.The main class is named SalesReportWebService.using System;using System.Web.Services;using System.Data;using System.Data.SqlClient;using XmlNet.CS;[WebService(Namespace="xmlnet/cs/0735618011",Name="Northwind Sales Report Web Service",Description="The Northwind Sales Report Web Service")]public class SalesReportWebService{[WebMethod(CacheDuration=60)]public DataSet GetSalesReport(int theYear){SalesDataProvider m_dataManager;m_dataManager = new SalesDataProvider();}DataSet ds = new DataSet();ds.Tables.Add(m_dataManager.GetSalesReport(theYear));return ds;}[WebMethod(CacheDuration=120)]public string GetSalesReportBarChart(int theYear){SalesDataProvider m_dataManager;m_dataManager = new SalesDataProvider();return m_dataManager.GetSalesReportBarChart(theYear);}The class features two methods—GetSalesReportBarChart and GetSalesReport—thatare simply wrappers around the same methods of the SalesDataProvider class. As wesaw in Chapter 12, the SalesDataProvider class provides the implementation ofbusiness logic, including the code necessary to draw graphics.465
If you compare this code with the remotable object in Chapter 12, you can't help butnotice a close resemblance. For the most part, this similarity depends on the use of anintermediate, common class. Just this fact proves the extreme flexibility of the .NETFramework. Rolling your own functionalities into an interface-less Web site is just oneside of a coin that has on its other side .NET Remoting accessibility. Later in thischapter, after we finish our implementation of a Web service, we'll complete thecomparison between .NET Remoting and Web services. Figure 13-3 shows the typicaluser interface that IIS and ASP.NET provide for Web services, mostly for testingpurposes.Figure 13-3: The standard user interface for .NET Framework Web services.If you test the Web service using a Netscape browser, you might get a slightly differentuser interface, depending on the version of the browser and the level of support itprovides for cascading style sheets (CSS). Also bear in mind that the Web serviceconsole shown in Figure 13-3 assumes that your client machine has a programregistered to handle XML files. The response of the method is saved to a local XML filethat is then displayed through the registered program. On many Microsoft Windowsmachines, the default handler of XML files is Internet Explorer.Figure 13-4 shows what happens when you test the GetSalesReport method with thedefault (and test-only) user interface.466
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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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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
Page 419 and 420: XmlAttributes changesFirstName = ne
Page 421 and 422: {if (emp.Territories == null)emp.Te
Page 423 and 424: {// Import type mapping information
Page 425 and 426: As you can see, the first file crea
Page 427 and 428: A good source for learning about SO
Page 429 and 430: NoteSome programmers believe that .
Page 431 and 432: involved, you must use Web services
Page 433 and 434: handled by .NET Remoting; the user
Page 435 and 436: Figure 12-3: How .NET Remoting mars
Page 437 and 438: If you want to play with the transp
Page 439 and 440: The query involves three tables—E
Page 441 and 442: As we saw in Chapter 4, the XmlText
Page 443 and 444: {// Propertiesprotected SalesDataPr
Page 445 and 446: We'll look more closely at channels
Page 447 and 448: server only when the client calls a
Page 449 and 450: Figure 12-5: The IIS application ma
Page 451 and 452: this little requirement is enough t
Page 453 and 454: typeof(ServiceSalesProvider),"tcp:/
Page 455 and 456: }The code in boldface demonstrates
Page 457 and 458: BinaryWriter writer = new BinaryWri
Page 459 and 460: Chapter 13: XML Web ServicesOvervie
Page 461 and 462: intSOAP is not magic—it is a simp
Page 463 and 464: public class MyWebService : WebServ
Page 465 and 466: effectively exposed over the Web, a
Page 467 and 468: Format of SOAP Messages for a Web M
Page 469: The SoapRpcMethod AttributeThe RPC
Page 473 and 474: Figure 13-5: Processing a Web servi
Page 475 and 476: The machine.config file is an XML f
Page 477 and 478: Namespace="xmlnet/cs/0735618011")]p
Page 479 and 480: In situations in which the URL can'
Page 481 and 482: Const TheYear = 1997' Create the HT
Page 483 and 484: implementation does make a lot of s
Page 485 and 486: Mobile code allows you to send C# o
Page 487 and 488: 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
Page 501 and 502: 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
Page 507 and 508: "SERVER=localhost;DATABASE=northwin
Page 509 and 510: Chapter 15: .NET Framework Applicat
Page 511 and 512: 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
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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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