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The WaitCallback delegate can point to any subroutine that takes a System.Object as its sole parameter (which represents the optional state data). Do note that if you do not provide a System.Object when calling QueueUserWorkItem(), the CLR automatically passes the value Nothing. To illustrate queuing methods for use by the CLR thread pool, consider the following program, which makes use of the Printer type once again. In this case, however, you are not manually creating an array of Thread types; rather, you are assigning members of the pool to the PrintNumbers() method: Module Program Sub Main() Console.WriteLine("Main thread started. ThreadID = {0}", _ Thread.CurrentThread.GetHashCode) Dim p As Printer = New Printer Dim workItem As WaitCallback = AddressOf PrintTheNumbers ' Queue the method 10 times For i As Integer = 0 To 9 ThreadPool.QueueUserWorkItem(workItem, p) Next Console.WriteLine("All tasks queued") Console.ReadLine() End Sub Sub PrintTheNumbers(ByVal state As Object) Dim task As Printer = CType(state, Printer) task.PrintNumbers() End Sub End Module At this point, you may be wondering whether it would be advantageous to make use of the CLR-maintained thread pool rather than explicitly creating Thread objects. Consider these major benefits of leveraging the thread pool: The thread pool manages threads efficiently by minimizing the number of threads that must be created, started, and stopped. By using the thread pool, you can focus on your business problem rather than the application s threading infrastructure. However, using manual thread management is preferred in some cases, for example: If you require foreground threads or must set the thread priority. Pooled threads are always background threads with default priority (ThreadPriority.Normal). If you require a thread with a fixed identity in order to abort it, suspend it, or discover it by name.

Figure 9-4. Selecting the .NET command prompt At the command prompt, run xws_reg wsat+, and press Enter, and you are done with configuring the transaction support for QuickReturns Ltd. You can also register WsatUI.dll using regasm.exe to provide the Microsoft Management Console snap-in for WSAT configuration. Navigate to Control Panel Administrative Tools Component Services, and select Properties from My Computer, as shown in Figure 9-5. To register WsatUI.dll, you need to run regasm.exe /codebase WsatUI.dll at the command prompt. You can then configure the parameters of the WS-Atomic transaction protocol from the user interface, as illustrated in Figure 9-6.

That wraps up our examination of multithreaded programming under .NET. To be sure, the System.Threading namespace defines numerous types beyond what I had the space to cover in this chapter. Nevertheless, at this point you should have a solid foundation to build on.

Summary

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Another major issue to consider is the file size of your app A universal application combines the incremental code and separate xib files and image resources for both the iPhone and iPad versions into one package, which means it can often be nearly double the file size of a single platform app Although Apple recently raised the cellular 3G download limit from 10MB to 20MB to help accommodate universal applications, some content-heavy apps such as games may still exceed that file size If your universal application is larger than 20MB, that drastically reduces your app s potential audience to only people within Wi-Fi range Whether your app is free or a paid product, this factor alone may force you to release separate iPhone and iPad versions to ensure that your app can be downloaded by both Wi-Fi and cellular 3G connections..

<endpoint address="mex" binding="mexHttpBinding" name="mexHttpBinding" contract="IMetadataExchange" /> <host> <baseAddresses> <add baseAddress="http://localhost:8080/QuickReturns" /> </baseAddresses> </host> </service> </services> <behaviors> <serviceBehaviors> <behavior name="tradeServiceBehavior"> <serviceMetadata httpGetEnabled="true"/> <serviceDebug httpHelpPageEnabled="true" includeExceptionDetailInFaults="true"/> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> </configuration> You can also edit the configuration file with the configuration tool s Diagnostics window, shown in Figure 3-12.

This chapter began by examining how .NET delegate types can be configured to execute a method in an asynchronous manner. As you have seen, the BeginInvoke() and EndInvoke() methods allow you to indirectly manipulate a background thread with minimum fuss and bother. During this discussion, you were also introduced to the IAsyncResult interface and AsyncResult class type. As you learned, these types provide various ways to synchronize the calling thread and obtain possible method return values. The remainder of this chapter examined the role of the System.Threading namespace. As you learned, when an application creates additional threads of execution, the result is that the program in question is able to carry out numerous tasks at (what appears to be) the same time. You also examined several manners in which you can protect thread-sensitive blocks of code to ensure that shared resources do not become unusable units of bogus data. Last but not least, you learned that the CLR maintains an internal pool of threads for the purposes of performance and convenience.

y now, you ve gained a solid foundation in the VB 2005 language and the core services provided by the .NET platform. I suspect that when you contrast the object model provided by .NET to that of classic COM and VB 6.0, you ll no doubt be convinced that these are two entirely unique systems. Regardless of the fact that COM is now considered to be a legacy framework, few of us are in a position to completely abandon the ways of COM and Visual Basic 6.0 (after all, we ll always have legacy systems to maintain). The truth is that people have spent hundreds of thousands of hours building systems that make substantial use of these legacy technologies. Thankfully, the .NET platform provides various types, tools, and namespaces that make the process of COM and .NET interoperability quite straightforward. The chapter begins by examining the process of .NET to COM interoperability and the related Runtime Callable Wrapper (RCW). The latter part of this chapter examines the opposite situation: a COM type communicating with a .NET type using a COM Callable Wrapper (CCW).

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