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To develop and publish applications for the iPad, iPhone, or any other future i devices, you need to sign up to Apple s developer program. Ordinarily, we d just mention this in passing and leave you to your own devices to get signed up. However, it s worth pointing out one nuance of the sign-up process that might, at first glance, appear to dissuade many budding iOS developers. Depending on which page you read on the Apple Developer web site, it can appear that you need to sign up for a $99 iOS Developer Program membership. Notably, this is displayed prominently on the iOS Developer home page, http://developer.apple.com/programs/ios/. Although it is true that you need to buy such a membership to eventually distribute applications via the iTunes store (and jump the various hurdles of application approval), you only need to register as an Apple developer in order to gain access to the tools, SDKs, and so on, for iOS development. Simple registration as a developer is free! It can be a little confusing when following the links on the Apple site, but at the time of writing this book, if you head straight to http://developer.apple. com/programs/register/, you ll have no problems signing up. Naturally, if you come to love building SQLite-based iOS apps, you can upgrade your registration at any time to qualify for distributing your applications via iTunes.

The primary job of CriteriaBase is to provide a default implementation of ICriteria, making it easy to create a custom criteria class by simply subclassing CriteriaBase: <Serializable()> _ Public Class MyCriteria Inherits CriteriaBase Public Property Value1() As String Get End Get Set(ByVal value As String) End Set End Property Public Property Value2() As String Get End Get Set(ByVal value As String) End Set End Property Public Sub New(ByVal value1 As String, ByVal value2 As String) MyBase.New(GetType(MyBusinessClass)) Me.Value1 = value1 Me.Value2 = value2 End Sub End Class The line of code in bold indicates the key point of interaction between this subclass and the base class. The CriteriaBase class needs to know the type of business object being created, retrieved, or deleted. It gets this Type object as a parameter to its constructor, and that value is typically provided directly by the subclass.

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The data portal is covered in 15. One part of the data portal is the DataPortal types in the Csla namespace. There are two types: DataPortal and DataPortal(Of T). The DataPortal Module exposes a set of Public methods that can be used for synchronous interaction with the data portal. It is declared like this: Public Module DataPortal The most common way to use the data portal is through these synchronous Shared methods, and most business classes use the DataPortal Module. In WPF you can use the CslaDataProvider control from the Csla.Wpf namespace to asynchronously retrieve business objects. In other types of applications, such as Windows Forms, you can use the .NET BackgroundWorker component to do the same thing, but that requires extra work on the part of the UI developer. To minimize that effort, you can use the DataPortal(Of T) class, which provides asynchronous access to the data portal. This class is defined like this: Public Class DataPortal(Of T) Notice that this is not a Module, and in fact you must create an instance of the class to call its methods. The data portal is a large and relatively complex part of CSLA .NET and is covered in 15.

Once you ve signed up as an Apple developer, you need to download Apple s integrated development environment, known as Xcode, and the iOS SDK. In another of Apple s quirks, the iOS SDK includes Xcode. That means you don t need to download Xcode and a separate SDK. The iOS SDK includes bundled versions of SQLite, which we ll discuss shortly, so you also can avoid downloading and maintaining separate versions of SQLite libraries if you choose. However, this bundled approach can also can trick first-timers to Apple s iOS development world, because one s instinct is to download Xcode as the IDE you plan to use and then add in the iOS SDK. You ll find yourself needlessly downloading a few extra gigabytes of software if you take this approach. Apple makes downloading the iOS SDK (with the included Xcode) straightforward. Once you log in with your developer credentials, follow the download link on the developer home page, and choose the option Xcode 3.2.4 and iOS SDK 4.1. This should download a file named xcode_3.2.4_and_ios_sdk_4.1.dmg, which is approximately 3.3GB in size.

Public Web service: An application accesses a Web service provided by a third party. In this scenario the users are authenticated by sending a username and a password to the Web service. The Web service decrypts this data and validates it against a local identity store. The information that is transmitted needs to be protected, so the client and the server communicate using HTTPS. The service is accessed via the Internet, as shown in Figure 6-1.

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