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This technique is similar to the DependencyProperty concept used by WPF and WF.
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C HAPTE R 6 BUSINES S FRAM EWORK IMPLEMENTA TION
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The PropertyInfo class is declared like this: Public Class PropertyInfo(Of T) Implements Core.IPropertyInfo Implements IComparable Notice that it implements an IPropertyInfo interface from the Csla.Core namespace. Technically, CSLA .NET accepts IPropertyInfo parameters everywhere, and this PropertyInfo class is just one possible implementation. This is an intentional extensibility point for CSLA .NET, allowing you to create other IPropertyInfo implementations (or subclasses of PropertyInfo) that store other metadata about each property. One scenario where you might do this is if you want to store data access metadata, such as the database, table, and column name where the property value is stored.
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ReadOnlyBase
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The BusinessBase and BusinessListBase classes provide the tools needed to build editable objects and collections. However, most applications also include a number of read-only objects and collections. An application might have a read-only object that contains system configuration data, or it might have a read-only collection of ProductType objects that are used just for lookup purposes. The ReadOnlyBase class provides a base on which business developers can build read-only root and child objects. By definition, a read-only object is quite simple: it s just a container for data, possibly with authorization or formatting logic to control how that data is accessed. It doesn t support editing of the data, so there s no need for n-level undo, change events, or much of the other complexity built into BusinessBase. ReadOnlyBase supports read-only properties, authorization, and persistence. Like all base classes, this one is Serializable and MustInherit. It also implements Csla.Core. IBusinessObject to provide some level of polymorphic behavior even though this is a generic class: <Serializable()> _ Public MustInherit Class ReadOnlyBase(Of T As ReadOnlyBase(Of T)) Inherits Core.MobileObject Implements ICloneable Implements Core.IReadOnlyObject Implements Csla.Security.IAuthorizeReadWrite Implements Server.IDataPortalTarget Implements Core.IManageProperties End Class Like BusinessBase, the generic type T is constrained to be the type of business object being created, so a business class is declared like this: <Serializable()> _ Public Class DefaultCustomerData Inherits ReadOnlyBase(Of DefaultCustomerData) End Class Presumably, any business object based on this class would consist entirely of read-only properties or methods that just return values. ReadOnlyBase supports data binding, authorization, and persistence. Figure 6-10 illustrates the inheritance hierarchy for ReadOnlyBase.
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CHAPTER 6 BUS INE SS FRA MEWORK I MPLEME NTA T ION
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Figure 6-10. Inheritance hierarchy for ReadOnlyBase(Of T)
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MobileObject exists to support serialization through the MobileFormatter, which is part of CSLA .NET for Silverlight. CSLA .NET for Silverlight is outside the scope of this book, and MobileObject has no impact on how CSLA .NET works within the .NET runtime.
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Because ReadOnlyBase provides such little functionality, it doesn t need a complex base class. It contains an AuthorizationRules object like BusinessBase and interacts with the DataPortal class, but otherwise it doesn t need most of the advanced features of CSLA .NET required by BusinessBase. Read-only objects are common in most business applications, and the features supported by ReadOnlyBase are fully explored in s 7 through 14.
ReadOnlyListBase
Like the ReadOnlyBase class, ReadOnlyListBase is quite simple. It is designed to make it easy for a business developer to create a business collection that doesn t allow items to be added or removed. Presumably, it will be used to contain read-only child objects, but any type of child object is allowed. Read-only collections do support data binding, authorization, and persistence. The ReadOnlyListBase class is defined like this: <Serializable()> _ Public MustInherit Class ReadOnlyListBase(Of T As ReadOnlyListBase(Of T, C), C) Inherits Core.ReadOnlyBindingList(Of C) Implements Csla.Core.IReadOnlyCollection Implements ICloneable Implements Server.IDataPortalTarget End Class Like BusinessListBase, it accepts two generic type parameters. Type T is constrained to be a subclass of this base class and refers to the type of the collection being created. Type C is the type of the child object to be contained within the collection, and it can be any type. Again, it would make the most sense for the child type to be some form of read-only object, but that s not required by the collection class. A business collection would be declared like this:
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