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

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node.Attributes["value"].Value = String.Format("{0},{1}",this.Left, this.Top);Finally, you save the file and persist the changes, as shown here:doc.Save(configFile);The XmlDocument class is particularly useful for performing this kind of task because itallows you to selectively access a particular node. If you have dozens of settings topersist, you might want to take a different route and rewrite the configuration file fromscratch each time. In this case, using an XML writer can result in more effective code.If the configuration file contains information other than application settings and thisinformation takes up a lot of room, referencing an external configuration file from the node can become an attractive option. Although the node's file attribute is not documented, it works just fine and enables you to separateapplication and user settings from the rest of the settings.The AppSettingsReader ClassA more specialized tool for reading application settings is the AppSettingsReader class.This class provides a single method, named GetValue, for reading values of a particulartype from the configuration file. The GetValue method takes two arguments—the nameof the setting to retrieve and the type to return—as shown here:public object GetValue(string key, Type type);The GetValue method retrieves the value of the given setting using the AppSettingsproperty and then performs an automatic cast to the specified type. Unlike theAppSettings property of the ConfigurationSettings object, which always returns a string,the GetValue method works in a strongly typed way. Suppose that you have thefollowing setting:You can load the value directly into a DateTime object. Here'show:AppSettingsReader reader = new AppSettingsReader();DateTime relDate = (DateTime) reader.GetValue("ReleaseDate",typeof(DateTime));MessageBox.Show(relDate.ToShortDateString());Note that the GetValue method is not marked as static, which means that you need afresh instance of the AppSettingsReader class to call the method. As mentioned, theGetValue method is a simple wrapper for the AppSettings property, which is a staticmember. If you plan to use AppSettingsReader in your application, you're better offinstantiating the object only once during the startup phase.Creating New Configuration SectionsThe section is one of many predefined configuration sections providedby the .NET Framework. Programmers can also create their own sections. To create anew section, you need to accomplish two basic tasks: declare the section in the block, and fill the section with custom data.One of the key bits of information you need to specify while declaring a new section isthe name of the section handler class. The section handler class can be one of thepredefined classes provided by the .NET Framework or a class that you write from515
scratch or inherit from an existing class. The section handler object is responsible forreading and parsing the actual contents of the setting.Declaring a New SectionThe node contains the declarations of all the sections in the variousconfiguration files. The predefined sections are declared in the machine.config file thatthe .NET Framework installs. Custom sections must be registered by the applicationthat plans to use them. The application's configuration file is a good place for insertingthis information.The node can accept up to four child nodes: ,, , and . The element removes a previouslydefined section, or a section group, from the block. The element clears all previously defined sections and section groups.NoteThe and elements don't affect the actual datastored in the configuration file. Removing a section doesn't erasethe related data from the file, but the data becomes unreachablebecause of the missing section declaration.A new section is registered using the element. As mentioned, the nameattribute of this element specifies the name of the section and the type attributespecifies the name of the section handler class. The name of the configuration sectionclass should contain full assembly information, including version, culture, and public keytoken, if any. All the predefined handlers are defined in the same assembly andtherefore share the same information, as in the following example:System, Version=1.0.3300.0, Culture=neutral,PublicKeyToken=b77a5c561934e089NoteWhen you create a custom assembly with no strong name (a strongname is necessary if you want to put the assembly in the globalassembly cache), the version number is defined in the assemblyinfofile that Microsoft Visual Studio .NET automatically adds to theproject. The culture is neutral, and the public key token is null.Here's an example:AppSettings_CS, Version=1.0.9.0, Culture=neutral,PublicKeyToken=nullThe custom section follows the block and contains the actualconfiguration settings. The following code creates a new section nameduserPreferences that accepts name/value pairs:516
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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
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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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Page 479 and 480: In situations in which the URL can'
Page 481 and 482: Const TheYear = 1997' Create the HT
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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
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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: Some internal variablesXmlNodeList
Page 523 and 524: Table 15-2: Predefined Section Hand
Page 525 and 526: The interface includes a single met
Page 527 and 528: NameValueCollection coll;coll = Con
Page 529 and 530: }if (configMenu != null)AddMenuTool
Page 531 and 532: }}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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