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Structures and class types can both implement IDisposable (unlike overriding Finalize(), which is reserved for class types), as the object user (not the garbage collector) invokes the Dispose() method.

Whereas the messaging layer provides total control over the messages flowing around in your application, the service model layer is a higher-level abstraction layer that allows you to influence the messaging through object-oriented programming principles. This is really where the WCF team was able to reach its design goals. The service model layer offers an easy-to-use API with classes, methods, attributes, and configuration to build connected applications. Behaviors are the most important concept in this regard. You can apply multiple behaviors on the client and service sides. Behaviors don t influence the contract in any way; in other words, consumers of services don t know the details about the behavior of the service. Behaviors influence the conversion from messages to .NET types, instancing, throttling, concurrency, and error handling. Up until now in this book, we have covered the generic concepts of the entire API; the rest of this chapter is focused on the service model layer. This is the layer you will use the most.

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Here is an updated MyResourceWrapper class that now implements IDisposable, rather than overriding System.Object.Finalize(): ' Implementing IDisposable. 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. End Sub End Class

The default size of a popover is 320 pixels wide and 1100 pixels tall, but you can easily customize the width and height with the popoverContentSize property But you may find it interesting that the default 320-pixel width is the same size as the iPhone s portrait mode width That s no coincidence! With that default width, it s much easier to convert most existing iPhone app views into popovers when creating an iPad version you won t need to redesign much (if any) of the view s original layout There are a few additional configuration options and considerations when using popovers, which are covered at length in 6 You ll walk through the creation of several popovers as you continue to develop the Dudel drawing app, so that chapter is a must-read Popovers might just be one of the most important new features of iPhone SDK 32.

Visual Studio 2005 will autocomplete interface implementation as soon as you hit the Enter key. In fact, when implementing IDisposable, the IDE injects a good deal of code statements, which will become more understandable once you complete this chapter.

ServiceHost gives you access to the WCF hosting infrastructure on the server side whereas ChannelFactory gives you access to the WCF hosting infrastructure on the client side. The following sections cover the basics of ServiceHost and ChannelFactory from a programming model perspective. In 4, you will learn about hosting web services in IIS. 5 covers the complete WCF hosting infrastructure and shows you the different options WCF offers in terms of hosting services in different types of applications and using services in different types of clients. In this chapter, we cover only self-hosting and console applications.

Notice that a Dispose() method is not only responsible for releasing the type s unmanaged resources, but should also call Dispose() on any other contained disposable methods. Unlike Finalize(), it is perfectly safe to communicate with other managed objects within a Dispose() method. The reason is simple: the garbage collector has no clue about the IDisposable interface and will never call Dispose(). Therefore, when the object user calls this method, the object is still living a productive life on the managed heap and has access to all other heap-allocated objects. The calling logic is straightforward: Sub Main Dim rw As New MyResourceWrapper() rw.Dispose() Console.ReadLine() End Sub Of course, before you attempt to call Dispose() on an object, you will want to ensure the type supports the IDisposable interface. While you will typically know which objects implement IDisposable by consulting the .NET Framework 2.0 SDK documentation, a programmatic check can be accomplished using the TypeOf/Is syntax discussed in 6: Sub Main() Dim rw As New MyResourceWrapper() If (TypeOf rw Is IDisposable) Then

rw.Dispose() End If Console.ReadLine() End Sub This example exposes yet another rule of working with .NET memory management:

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