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At this point, we have seen two different approaches to construct a class that cleans up internal unmanaged resources. On the one hand, we could override System.Object.Finalize(). Using this technique, we have the peace of mind that comes with knowing the object cleans itself up when garbage collected (whenever that may be) without the need for user interaction. On the other hand, we could implement IDisposable to provide a way for the object user to clean up the object as soon as it is finished. However, if the caller forgets to call Dispose(), the unmanaged resources may be held in memory indefinitely. As you might suspect, it is possible to blend both techniques into a single class definition. By doing so, you gain the best of both models. If the object user does remember to call Dispose(), you can inform the garbage collector to bypass the finalization process by calling GC.SuppressFinalize(). If the object user forgets to call Dispose(), the object will eventually be finalized. The good news is that the object s internal unmanaged resources will be freed one way or another in the most optimal manner. Here is the next iteration of MyResourceWrapper, which is now finalizable and disposable: ' A sophisticated resource wrapper. Class MyResourceWrapper Implements IDisposable ' The object user should call this method ' when they finished with the object. Public Sub Dispose() Implements IDisposable.Dispose ' Clean up unmanaged resources here. ' Dispose other contained disposable objects. ' No need to finalize if user called Dispose(), ' so suppress finalization. GC.SuppressFinalize(Me) End Sub ' The garbage collector will call this method if the ' object user forgets to call Dispose(). Protected Overrides Sub Finalize() Try ' Clean up any internal unmanaged resources. ' Do **not** call Dispose() on any managed objects.

In those cases, you can compare a specific function name with NULL If an iPad-only function is equal to NULL, then the user s device is not an iPad You ll also need to perform similar code checks if your app utilizes hardware features that are available on only one of the platforms, such as the iPhone s camera And don t forget your xib interface files and images that are uniquely designed for a specific screen size Since your iPad app may require a different interface and graphics than your iPhone app, your view controller classes will need to be programmed to load the correct resources All of this talk about conditional coding may sound like a lot of work, and truthfully, it is fairly time-consuming to implement at first But your efforts will prove worthwhile when working on future updates of your app.

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Because these models already establish some of the context and purpose in their boundary, it makes it easier to design the new services In addition, the naming of the service should also influence the naming of the individual operations within the service As stated earlier, a well-named service will already establish a clear context and meaning of the service, and the individual operations should be rationalized so as not to be confusing or contradict the service Also, because the context is established, the operations should also try to avoid confusing naming standards For example, if you have a service that performs stock operations, then one of the operations in that should be GetQuote instead of GetStockQuote, because the context has already been established Similarly, if you can reuse the service, then avoid naming the operations after some particular task, rather trying to keep the naming as generic as possible.

Finally MyBase.Finalize() End Try End Sub End Class Notice that this Dispose() method has been updated to call GC.SuppressFinalize(), which informs the CLR that it is no longer necessary to call the destructor when this object is garbage collected, given that the unmanaged resources have already been freed via the Dispose() logic.

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