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The test data is stored in the TestEventDao.xml file and is loaded before your test runs. (You ll recall that the logic to load the file is in the ProjectTestCase class.) Once the test data is loaded, the test executes. If you have multiple tests in the test cases, the data is refreshed before each test. However, we ve only looked at a subset of DBUnit s functionality. You can also use DBUnit to verify the state of the database. Let s look at another test method:

All business objects will be implemented to make use of the class-in-charge scheme discussed in 1. Factory methods are used in lieu of the New keyword, which means that it s best to prevent the use of New, thereby forcing the UI developer to use the factory methods instead. The data portal mechanism, as implemented in 4, requires business classes to include a default constructor. As I reviewed the create, fetch, update, and delete processes for each type of object earlier in this chapter, each sequence diagram showed how the server-side data portal created an instance of the business object. This is done using a technique that requires a default constructor. By making the default constructor Private or Protected (and by not creating other Public constructors), you ensure that UI code must use the factory methods to get an instance of any object: ' ... #Region " Factory Methods " Private Sub New() ' require use of factory methods End Sub #End Region ' ... This constructor both prevents the New keyword from being called by code outside this class and provides the data portal with the ability to create the object via reflection. Your classes might also include other constructors, but this one is required for all objects.

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The FillControls() helper method simply retrieves the <employee> element whose employeeid attribute is selected in the combo box. It then fills the text boxes with <firstname>, <lastname>, <homephone>, and <notes> element values. The Element() method accepts the name of an XML element and returns the first occurrence of that element as an XElement instance. Finally, the status label of the VCR display is updated to reflect the current employee position.

Treat arrays as collections. Create and use a multidimensional array. Create a multidimensional array where the capacity of each dimension can differ.

Figure 7.6 In an ordinary HTTP transmission, data is transmitted across the Internet in plain text, allowing it to be read or modified at intermediate nodes by the man in the black hat.

WriteLine, and If are instantiated but never named. This approach is similar to the technique called functional construction, which is used to build XML trees. If it seems strange to you, you might want to review some of the documentation on functional construction on MSDN.

The dynamic cast performs a runtime check and returns a nullptr if the type of the casted object does not support the target type Therefore, the preceding code checks if the cast is not nullptr to find out if the cast was successful In the sample code shown here, it is only required to find out if an expression can be casted and the result of a successful cast is not needed In contrast to other languages, C++/CLI does not support an extra construct for this need C#, as an example, has the is operator to find out if an expression is castable to a given type // this is C# code: if ( req is FtpWebrequest ) .. variable req can be casted to an FtpWebRequest .. Even though this C# expression appears to be more expensive than the equivalent C++/CLI expression, the same IL instructions are generated for both cases.

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The concrete WebRequest-derived classes do not support public constructors that could be used to create a new instance The only way to instantiate an HttpWebRequest for a URL is to call WebRequest::Create passing an HTTP- or HTTPS-based URL In addition to the members of WebRequest, HttpWebRequest offers many members that are specific for the HTTP protocol (eg, to specify whether a GET or a POST request should be made) To access these members, the WebResponse handle returned by WebRequest::Create must be downcasted to an HttpWebRequest handle There are different options to achieve such a downcast As in the sample before, a dynamic_cast could be used The dynamic_cast returns nullptr either if the input was a nullptr or if the cast was not successful.

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