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Delegates and events are completely new concepts to the traditional C++ developer. Truth be told, both provide the same functionality, allowing functions to be manipulated as reference handles. Because a handle can be assigned to more than one value in its lifetime, it is possible to have functions executed based on whichever function was last placed in the handle. For those of you with a C++ background, you might notice that this object-oriented approach is very similar to function pointers. Where they differ is that delegates and events are ref classes and not pointers, and delegates and events only invoke global functions or member methods of ref classes. You might be wondering, if they all do the same thing, why introduce the new concepts Remember that a key aspect of .NET is language independence. Unfortunately, function pointers are strictly a C++ language feature and are not easily implemented in other languages, especially languages that have no pointers. Also, function pointers are far from easy to implement. Delegates and events were designed to overcome these problems.

A delegate is a ref class that accepts and then invokes one or more methods that share the same signature from global functions or other classes that have methods with this same signature. The .NET Framework supports two forms of delegates: System::Delegate: A delegate that accepts and invokes only a single method. System::MulticastDelegate: A delegate that accepts and invokes a chain of methods. A MulticastDelegate can perform something known as multicast chaining, which you can think of as a set of delegates linked together and then later, when called, executed in sequence. C++/CLI only supports multicast delegates, but this really isn t a problem because there s nothing stopping a multicast delegate from accepting and invoking only one method. The creating and implementing of delegates is a three-part process with an optional fourth part if multicast chaining is being implemented: 1. Create the delegate. 2. Create the global function(s) or member method(s) to be delegated. 3. Place the method on the delegate. 4. Combine or remove delegates from the multicast chain.

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Public Class Logger : Inherits WebTestPlugin Private _logStream As FileStream = Nothing Private _logWriter As StreamWriter = Nothing Private WithEvents _test As WebTest = Nothing Public Overrides Sub PreWebTest(ByVal sender As Object, ByVal e As _ Microsoft.VisualStudio.TestTools.WebTesting.PreWebTestEventArgs) _logStream = New FileStream("c:\logfile.txt", FileMode.Append) _logWriter = New StreamWriter(_logStream) _logWriter.AutoFlush = True _logWriter.WriteLine("Beginning Test (" + Now.ToString() + ")") _test = e.WebTest End Sub Public Sub Webtest_PostRequest(ByVal sender As Object, ByVal e As _ Microsoft.VisualStudio.TestTools.WebTesting.PostRequestEventArgs) Handles _ _test.PostRequest _logWriter.WriteLine(e.Request.Url.ToString()) End Sub Public Overrides Sub PostWebTest(ByVal sender As Object, ByVal e As _ Microsoft.VisualStudio.TestTools.WebTesting.PostWebTestEventArgs) _logWriter.WriteLine("Ending Test (" + Now.ToString() + ")") _logWriter.Close() End Sub End Class The Logger class is pretty straightforward. It inherits from the WebTestPlugin class and overrides the PreWebTest and PostWebTest methods. These methods are called at the beginning and end of the test respectively. The additional step taken here is that the PostRequest event of the WebTest is being handled so the URL for each event can be logged to the log file. Aside from that, there are no especially difficult steps for creating your own plugin. One key thing to note is that the PreWebTest and PostWebTest are called once for each data row in a data-driven test. Because of this, the test explicitly closes and opens the file stream for each row in the test. So the constructor should be used for global test initialization and the PreWebTest should be used for individual run initialization. To implement the plugin, open the EffortTracking Solution. Add a reference to the assembly, which contains the Logger class. Double-click the AddItem web test so it is displayed in the Web Test window. Click the Set Web Test Plugin button at the top of the window. Select the Logger class and click OK.

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