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' VB ' Declares the new XmlDocument, XmlElement, and XmlText Dim aDocument As New Xml.XmlDocument Dim anElement As Xml.XmlElement Dim aText As Xml.XmlText ' Creates a new node anElement = aDocument.CreateElement("TestNode") ' creates the new text node aText = aDocument.CreateTextNode("This is the test text") ' Declares a new node to hold the reference to the new node that will be ' returned when anElement is inserted into the XmlDocument Dim node As Xml.XmlNode ' Inserts anElement into the XmlDocument node = aDocument.AppendChild(anElement)

SOAP extensions provide a way to add additional functionality to your Web ser vice methods. You create a SOAP extension by using a custom library class that inherits from the System.Web.Services.Protocols.SoapExtension class. Four stages are encountered during the serialization and deserialization of a SOAP message: BeforeSerialize, AfterSerialize, BeforeDeserialize, and AfterDeserialize. The SoapMessageState enumeration is used to determine what stage of the pro cessing is occurring, and this stage can be inspected in an overridden ProcessMessage method. You can configure the SOAP extension to associate with a particular Web method by adding a class to your extension that inherits from the Sys tem.Web.Services.Protocols.SoapExtensionAttribute class.

Query 2 index: NoIncludedColumns The execution plan is shown in Figure 6-6.

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You can use the following questions to test your knowledge of the information in Les son 3, How to Implement SOAP Extensions. The questions are also available on the companion CD if you prefer to review them in electronic form.

9

Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.

Query 3 index: NotCovered The execution plan is shown in Figure 6-7.

1. Which statement best describes when the BeforeSerialize stage for an incoming request message occurs A. Occurs right after the Web method is invoked but before the request is seri alized into XML B. Occurs before response is deserialized into an object C. Occurs after serialization in which the data is serialized into XML but before the XML is sent across the network D. Occurs right after the deserialization process but before the client receives the results 2. Which overridden method of the SoapExtension class is used to intercept the incoming stream and determine which stage is occurring A. ChainStream

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2

SELECT o.PKCol, i.Col2 FROM Test.OtherTable AS o INNER JOIN Test.IncludedColumnsTest AS i WITH(INDEX(NotCovered)) ON o.Col1 = i.Col1 WHERE o.PKCol BETWEEN 1 AND 10000;

B. GetInitializer C. ProcessStage D. ProcessMessage 3. How do you configure the SOAP extension to associate with a particular Web method A. Add a <SoapExtension> element to the web.config file and set the method attribute to be the name of your Web method. B. Add a <SoapExtensionMethod> element to the web.config file that is set to the name of your Web method. C. Add a class to your extension that inherits from the System.Web.Ser vices.Protocols.SoapExtensionAttribute class. D. Add a class to your extension that inherits from the System.Web.Services.Pro tocols class.

To further practice and reinforce the skills you learned in this chapter, you can per form the following tasks:

Query 1, with the IncludedColumns index, is the best-performing query, with 32,726 page reads. Query 2, with the NoIncludedColumns index, used 53,994 page reads. As you can see, the difference in the number of page reads between the two indexes is roughly the same as the difference in index levels (40 percent). Query 3, with the NotCovered index, is the worst-performing query with 62,900 page reads because of the extra reads necessary to fetch the data that was not found in the index from the table. (Note the extra Nested Loops Join operator in the execution plan of Query 3.)

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Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involv ing the topics of this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test.

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