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Array ( [0] => Array ( [Post] => Array ( [name] => Writing Posts in XML is a Snap [date] => 2008-11-08 12:00:01 [content] => Using the XML utility class in Cake with the Set::reverse() function makes parsing XML easy. [user_id] => 1 ) ) [1] => Array ( [Post] => Array ( [name] => More XML Posts, Not so Bad [date] => 2008-11-08 12:00:02 [content] => Using the XML utility class in Cake with the Set::extract() function makes parsing XML easy. [user_id] => 1 ) ) ) This array looks just like those you re used to in Cake. In the Index view, you can add these results to the list by running a loop just like the current loop for the $posts variable. Of course, in the app/webroot/files/data.xml file, I left the <id> tags blank; you ll have to set those manually or build an auto_increment method into the DataSource to provide a unique ID for each post in the XML file. Not only can DataSources connect with external files, but they can also be used for pulling data from just about anywhere, such as a web service, e-mail, or some legacy system. This tutorial explored using XML as an external datasource and demonstrated how extending the model in this way actually improves the code and maintains better order throughout the framework. Third-party DataSources by other developers are already available online; you might want to try installing one as practice for using DataSources in your Cake applications.

To write a custom trace message, you use the Write() method or the Warn() method of the built-in Trace object. These methods are equivalent. The only difference is that Warn() displays the message in red lettering, which makes it easier to distinguish from other messages in the list. Here s a code snippet that writes a trace message when the user clicks a button: Protected Sub cmdWrite_Click(ByVal sender As Object, _ ByVal e As EventArgs) Handles cmdWrite.Click Trace.Write("About to place an item in session state.") Session("Test") = "Contents" Trace.Write("Placed item in session state.") End Sub These messages appear in the trace information section of the page, along with the default messages that ASP.NET generates automatically (see Figure 8-25).

Figure 8-25. Custom trace messages You can also use an overloaded method of Write() or Warn() that allows you to specify the category. A common use of this field is to indicate the current method, as shown in Figure 8-26.

Figure 8-26. A categorized trace message Protected Sub cmdWriteCategory_Click(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles cmdWriteCategory.Click Trace.Write("cmdWriteCategory_Click", _ "About to place an item in session state.") Session("Test") = "Contents" Trace.Write("cmdWriteCategory_Click", _ "Placed item in session state.") End Sub Alternatively, you can supply category and message information with an exception object that will automatically be described in the trace log, as shown in Figure 8-27.

Another way to extend the model is with behaviors. Behaviors provide rules for models, like the rules you may set on your mail program to apply to your incoming mail. For example, you may want the model, when updating a record in the database, to perform multiple calculations of the data on the fly and not only update one record or a couple of associated records but perform a series of updates across the database. Using a behavior, rather than building

End Function End Class All the GetHtml() method does is read the private data and format it in some attractive way. You can take this block of HTML and place it on a web page to represent the product. This really targets the class as a user interface class rather than as a pure data class or business object.

Currently, the Product class has a problem Ideally, classes should ensure that instances are always in a valid state However, unless you explicitly set all the appropriate properties, the Product object won t correspond to a valid product This could cause an error if you try to use a method that relies on some of the data that hasn t been supplied To solve this problem, you need to equip your class with one or more constructors A constructor is a method that automatically runs when an instance is created In VB, the constructor is always a method with the name New() The next code example shows a new version of the Product class It adds a constructor that requires the product price and name as arguments Public Class Product ' (Additional class code omitted for clarity.

1. Click Tools Solver. 2. Click Reset All, and then click OK. 3. Click the Set Target cell box, and then click or type cell N27. 4. Click the Value Of option. In the Value Of box, type 3. 5. Click the By Changing Cells box, and then select cells N2 through N26.