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CHAPTER 9 PARE NT-C HILD RELA TION SHIPS
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Private Shared _propertyDescriptors
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As PropertyDescriptorCollection
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Private Function GetPropertyDescriptor( _ ByVal propertyName As String) As PropertyDescriptor If _propertyDescriptors Is Nothing Then _propertyDescriptors = TypeDescriptor.GetProperties(GetType(C)) End If Dim result As PropertyDescriptor = Nothing For Each desc In _propertyDescriptors If desc.Name = propertyName Then result = desc Exit For End If Next Return result End Function The PropertyDescriptor concept comes from System.ComponentModel and is used extensively by Windows Forms data binding. This part of .NET is related to reflection but is a separate type system from reflection itself. Like reflection, however, the type descriptor functionality has a pretty high performance cost. To minimize the impact, the PropertyDescriptorCollection for the child object type is cached in a static field, so it is retrieved only once per AppDomain (typically once each time the application is run). The PropertyChanged event provides the name of the changed property only, so it is necessary to loop through all the items in the PropertyDescriptorCollection to find the matching property name, at which point the resulting PropertyDescriptor can be returned. If no match is found, Nothing is returned. Although all this behavior is automatically handled by the BindingList(Of T) base class, this code is necessary because BindingList(Of T) doesn t handle the case where the collection has been serialized and deserialized.
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Removing Child Objects from the Collection
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It is possible to remove an item from the collection. The basic process is handled automatically by the BindingList(Of T) base class. However, there are some complications that must be handled by BusinessListBase. Specifically, any LINQ to CSLA index must be updated, and there s interaction with the n-level undo behaviors, discussed in 13. This last point about n-level undo is the most complex. If changes to a collection can be rolled back, any removed items must be restored and any newly added items removed. I ll leave detailed discussions of LINQ to CSLA and n-level undo to their respective chapters. For now it is enough to know that the RemoveItem() method, which is a protected method provided by BindingList(Of T), is invoked when a child item is to be removed. This method contains important code necessary for both LINQ to CSLA and n-level undo. You should now have an understanding about how an editable collection provides not only the same parent functionality as an editable object but how it handles the child PropertyChanged events and must interact with the LINQ to CSLA and n-level undo functionality.
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CHAPTER 9 PARE NT-C HILD RELATION SHIPS
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Conclusion
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In this chapter I discussed how CSLA .NET supports important parent-child interactions, including the following: IsValid IsDirty Change events Parent reference N-level undo s 10 through 16 continue the coverage of how to implement CSLA .NET. Then, from 17 on, the focus is on building the simple business application designed in 3 to illustrate how the classes in the framework can be used to build applications based on business objects.
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Data Binding
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ata binding is a powerful concept that is supported by WPF, Windows Forms, and Web Forms. It is a Microsoft technology that provides an abstract and formal communication layer between the user interface and the business objects, or between the Interface Control layer and Business layer, to use the terms from 1. It is important to maintain clear separation of concerns between the Interface Control and Business layers to avoid having business logic creep into the UI and avoid UI logic creeping into the business objects. If either of those things occurs, the maintainability of your application will go down, and the cost of development and maintenance will go up. Having a prebuilt technology like data binding, which provides a powerful abstraction boundary between the two layers, can help a great deal. At a very basic level, all .NET objects support data binding. However, to take full advantage of everything data binding has to offer, objects need to implement a set of interfaces and behaviors, some of which can be quite complex. The end result is worth it, however, because this complex behavior can be implemented in a framework like CSLA .NET, so it doesn t impact your business objects directly. And with full support for data binding, you ll need to write a lot less code in the UI, and that increases the maintainability of any application. I ve been referring to data binding as though it were one technology. In reality, it is one concept, but the technology is somewhat different in WPF, Windows Forms, and Web Forms. Each type of UI has its own variation of data binding, though in each case the goal and end result are the same: to provide a clean, abstract way to connect the UI to the underlying business objects. Of the three, Windows Forms data binding is the most mature and powerful. It turns out that if your objects support Windows Forms data binding, they automatically do almost everything required by WPF and Web Forms. In this chapter, I ll discuss how the CSLA .NET framework supports data binding, first for Windows Forms and then for WPF. I ll wrap up with Web Forms, because it s the least demanding.
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