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Core Data DataPortal DataPortal\Client DataPortal\Hosts DataPortal\Server Security Validation
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Contains the Csla.Core types Contains the Csla.Data types Contains files in the Csla namespace that are part of the data portal functionality (see 4) Contains Csla.DataPortal, along with the Csla.DataPortalClient proxy classes (see 4) Contains the Csla.Server.Hosts host classes (see 4) Contains the Csla.Server types that implement the server-side data portal functionality (see 4) Contains the Csla.Security types Contains the Csla.Validation types
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By organizing the various files into folders, the project will be far easier to create and manage. Some of the folders listed here won t be used until 4, but it is worth getting them all set up now to be ready. There s an additional Diagrams folder in the code download, containing many of the diagrams (or pieces of them at least) used to create the graphics in this book.
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The CSLA .NET framework supports localization. For a framework, the key to supporting localization is to avoid using any string literal values that might be displayed to the end user. The .NET Framework and Visual Studio 2005 offer features to assist in this area through the use of resources. In the Solution Explorer window, double-click on the Properties node under the Csla project to bring up the project s properties windows. Click on the Resources tab to navigate to the built-in resource editor. Figure 3-2 shows this editor with several of the string resources from Resources.resx.
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CHAPTER 3 s BUSINESS FRAMEWORK IMPLEMENTATION
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Figure 3-2. Visual Studio resource editor
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The complete set of resources is available in the Resources.resx file in the download. Additionally, a number of people around the world have been kind enough to translate the resources to various languages. As this is an ongoing process, please refer to www.lhotka.net/cslanet/ download.aspx for updates to the framework and resource files. Now that the basic project has been set up, let s walk through each class or type in turn. To keep things organized, I ll follow the basic order from Table 3-1 (with a couple of exceptions). This way, the namespaces can be built one at a time.
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Csla.Core Namespace
The Csla.Core namespace contains types that are not intended for business developers. Rather, these types are intended for use by the CSLA .NET framework itself. This is a primary motivation for putting them into their own namespace to help keep them out of sight of business developers during normal development. These types may also be useful to people who wish to extend the framework. For instance, Core.BusinessBase could easily act as a starting point for creating some different or more advanced BusinessBase-style class. Likewise, Core.ReadOnlyBindingList is useful as a base for creating any type of read-only collection that supports data binding.
CHAPTER 3 s BUSINESS FRAMEWORK IMPLEMENTATION
IBusinessObject Interface
Generic types like BindingList(Of T) are very powerful because they allow a developer to easily create a strongly typed instance of the generic type. For instance Dim myStringList As BindingList(Of String) defines a strongly typed collection of type String. Similarly Dim myIntList As BindingList(Of Integer) defines a strongly typed collection of type Integer. Since both myStringList and myIntList are of type BindingList(Of T), you might think they are polymorphic that you could write one method that could act on both fields. But you can t. Generic types are not inherited, and thus do not come from the same type. This is highly counterintuitive at first glance, but nonetheless is a fact of life when working with generic types. Since CSLA .NET makes use of generic types (BusinessBase(Of T), BusinessListBase(Of T, C), etc.), this is a problem. There are cases in which a UI developer will want to treat all business objects the same or at least be able to use the .NET type system to determine whether an object is a business object or not. In order to treat instances of a generic type polymorphically, or to do type checks to see if those instances come from the same type, the generic type must inherit from a non-generic base class or implement a non-generic interface. In the case of BindingList(Of T), the generic type implements IBindingList. So both myStringList and myIntList can be treated as IBindingList types. To provide this type of polymorphic behavior to CSLA .NET business objects, all business base classes will implement Csla.Core.IBusinessObject. This, then, is the ultimate base type for all business objects. Here s the code for IBusinessObject: Namespace Core Public Interface IBusinessObject End Interface End Namespace Notice that this interface has no members (methods, properties, etc). This is because there are no common behaviors across both read-only and editable business objects. The interface remains incredibly useful, however, because it allows code to easily detect whether an object is a business object, through code like this: If TypeOf theObject Is Csla.Core.IBusinessObject Then ' theObject is a business object End If The next couple of interfaces will have more members.
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