s FRAMEWORK DESIGN in VB.NET

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CHAPTER 2 s FRAMEWORK DESIGN
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This isn t as easy at it might at first appear, as you ll see when the SmartDate class is implemented in 5. Much of the complexity flows from the fact that applications often need to compare an empty date to a real date, but an empty date might be considered very small or very large. You ll see an example of both cases in the sample application in 8. The SmartDate class is designed to support these concepts, and to integrate with the SafeDataReader so that it can properly interpret a null database value as an empty date.
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The business framework will base its collections on BindingList(Of T), thus automatically supporting data binding as well as collection behaviors. The BindingList(Of T) class is an implementation of the IBindingList interface. This interface not only defines basic data binding behaviors, but also exposes methods for sorting the contents of the collection. Unfortunately, BindingList(Of T) doesn t implement this sorting behavior. It would be possible to implement the sorting behaviors directly within the BusinessListBase and ReadOnlyBindingList classes. Unfortunately, it turns out that sorting a collection in place is somewhat complex. The complexity arises because IBindingList also supports the idea of removing the sort thus presumably returning the collection s contents to their original order. That necessitates keeping a list of the original position of all items when a sort is applied. Add to this the question of where to position newly added items, and things can get quite complex. ADO.NET provides one possible solution through its use of DataView objects that are used to provide sorted views of a DataTable. Taking a cue from ADO.NET, SortedBindingList provides a sorted view of any IList(Of T) collection, including all collection objects that inherit from BindingList(Of T). By implementing a sorted view, all the complexity of manipulating the original collection is avoided. The original collection remains intact and unchanged, and SortedBindingList just provides a sorted view of the collection. That said, SortedBindingList will provide an editable view of a collection if the original source collection is editable. In other words, editing a child object in a SortedBindingList directly edits the child object in the source collection. Similarly, adding or removing an item from a SortedBindingList directly adds or removes the item from the original collection.
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At this point, I ve walked through all the classes that will make up the business framework. Given that there are quite a few classes and types required to implement the framework, there s a need to organize them for easier discovery and use. The solution for this is to organize the types into a set of namespaces. Namespaces allow you to group classes together in meaningful ways so that you can program against them more easily. Additionally, namespaces allow different classes to have the same name as long as they re in different namespaces. From a business perspective, you might use a scheme like the following: MyCompany.MyApplication.FunctionalArea.Class A convention like this immediately indicates that the class belongs to a specific functional area within an application and organization. It also means that the application could have multiple classes with the same names: MyCompany.MyApplication.Sales.Product MyCompany.MyApplication.Manufacturing.Product
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CHAPTER 2 s FRAMEWORK DESIGN
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It s quite likely that the concept of a product in sales is different from that in manufacturing, and this approach allows reuse of class names to make each part of the application as clear and selfdocumenting as possible. The same is true when you re building a framework. Classes should be grouped in meaningful ways so that they re comprehensible to the end developer. Additionally, use of the framework can be simplified for the end developer by putting little-used or obscure classes in separate namespaces. This way, the business developer doesn t typically see them via IntelliSense. Consider the UndoableBase class, which isn t intended for use by a business developer: it exists for use within the framework only. Ideally, when business developers are working with the framework, they won t see UndoableBase via IntelliSense unless they go looking for it by specifically navigating to a specialized namespace. The framework has some namespaces that are to be used by end developers, and others that are intended for internal use. All the namespaces in the framework are prefixed with component-based, scalable, logical architecture (CSLA).
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s Note CSLA was the name of the COM-based business object framework about which I wrote in the mid-to-late 1990s. In many ways, this book brings the basic concepts and capabilities of that architecture into the .NET environment. In fact, .NET enables the CSLA concepts, though COM has often hindered them.
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Table 2-7 lists the namespaces used in the CSLA .NET framework. Table 2-7. Namespaces Used in the CSLA .NET Framework
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