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.NET types that do not demand any special contextual treatment are termed context-agile objects. These objects can be accessed from anywhere within the hosting AppDomain without interfering with the object s runtime requirements. Building context-agile objects is a no-brainer, given that you simply do nothing (specifically, you do not adorn the type with any contextual attributes and do not derive from the System.ContextBoundObject base class): ' A context-agile object is loaded into context 0. Class SportsCar End Class On the other hand, objects that do demand contextual allocation are termed context-bound objects, and they must derive from the System.ContextBoundObject base class. This base class solidifies the fact that the object in question can function appropriately only within the context in which it was created. Given the role of .NET context, it should stand to reason that if a context-bound object were to somehow end up in an incompatible context, bad things would be guaranteed to occur at the most inopportune times. In addition to deriving from System.ContextBoundObject, a context-sensitive type will also be adorned by a special category of .NET attributes termed (not surprisingly) context attributes. All context attributes derive from the System.Runtime.Remoting.Contexts.ContextAttribute base class. Given that the ContextAttribute class is not sealed, it is possible for you to build your own custom contextual attribute (simply derive from ContextAttribute and override the necessary virtual methods). Once you have done so, you are able to build a custom piece of software that can respond to the contextual settings.

Listing 3-12. The App.config File for the Client Code < xml version="1.0" encoding="utf-8" > <configuration> <system.serviceModel> <client> <endpoint address="http://localhost:8080/QuickReturns/Exchange" binding="basicHttpBinding" contract="QuickReturns.StockTrading.ExchangeServiceClient. ITradeService"> </endpoint> </client> </system.serviceModel> </configuration> There is an easier way to consume services without using the ChannelFactory. You can generate the proxies using the SvcUtil.exe utility. The SvcUtil.exe utility retrieves the metadata (WSDL) of the service, and based on that it will generate the proxy classes that can be used to call the service. In addition, it will make sure the contracts are generated as interfaces as well. Therefore, you can leave out the service contract and data contract you saw in Listing 3-11. The following call to SvcUtil.exe generates a proxy class for use in your client (make sure your service is running): svcutil.exe http://localhost:8080/QuickReturns The utility will generate a proxy class based on the metadata of the service, which can be retrieved with the following URL: http://localhost:8080/QuickReturns WSDL The utility will generate a proxy class for you (the file will be named TradeService.cs, and the configuration file is called Output.config). You can then simplify the client as shown in Listing 3-13. Listing 3-14 shows the generated Output.config configuration file. Listing 3-13. Simplified Client Code Using the Proxy Generated by SvcUtil.exe using System; using quickReturns; namespace QuickReturns.StockTrading.ExchangeService.Clients { class ExchangeServiceClientProxy { static void Main(string[] args) { TradeServiceProxy proxy = new TradeServiceProxy();

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This book doesn t dive into the details of building custom object contexts; however, if you are interested in learning more, check out Applied .NET Attributes (Apress, 2003).

As an iPhone developer, you re already familiar with how to make a UIViewController modal, which prevents the user from returning to the parent window until the modal view is closed. A modal view is a great solution when you need to present a much more sophisticated layout than what s possible in a limited UIAlertView. On the iPhone, a modal view fills the entire screen, which is perfectly fine with only 320 by 480 pixels. But on an iPad, there s considerably more display space, so you may not always want a modal view that stretches the full 1024 by 768 pixels. To accommodate the larger surface area, Apple has introduced four new modal style options, which can be assigned to a new UIViewController class property called modalPresentationStyle. As on the iPhone, you still call a modal view via presentModalViewController, but before doing so, you simply assign one of the new style options to the view controller s modalPresentationStyle property. For example, let s say your code already has an instance of UIViewController named myController. You could assign a modal style to it before presenting it on the screen, like this:

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