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The IReadOnlyCollection interface exists purely to support polymorphism for read-only collection objects that inherit from ReadOnlyListBase(Of T, C). As such, it is an empty interface: Interface IReadOnlyCollection Inherits IBusinessObject End Interface You can use this interface to easily determine whether a business object is a read-only collection as needed within your business or UI code.
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Editable root objects in CSLA .NET implement a Save() method. This includes objects that inherit from both BusinessBase and BusinessListBase. The ISavable interface formalizes the concept of a savable object, which really means an editable root object. You can use this interface to create a UI framework that can save any editable root object: Public Interface ISavable Function Save() As Object Sub SaveComplete(ByVal newObject As Object) Event Saved As EventHandler(Of SavedEventArgs) End Interface
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The SaveComplete() method exists for internal use by CSLA .NET only and should never be used by business or UI code.
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The ISavable interface defines a common Save() method and a Saved event. The Saved event is raised after an object has successfully saved itself by calling the data portal. This event follows the standard EventHandler pattern, passing two parameters to the event handler: a reference to the
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sender and a SavedEventArgs parameter. This SavedEventArgs parameter contains a reference to the new object that is returned as a result of the Save() method call. The Saved event is intended to address the complexity that occurs when your business object is referenced in numerous locations throughout your application, by multiple forms in the UI, for instance. If you call Save() on the object in one location, all the other places where that object is referenced must be updated to use the new object returned as a result of Save(). The Saved event provides a solution because it is a standard, centralized event that provides this notification. Any code holding a reference to a business object can handle the Saved event. That code will be notified when that object has been saved. The code can then update its reference to use the new object returned as a result of the Save() call.
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The SmartDate type extends DateTime to provide the concept of an empty date. It also adds the ability to convert the value into and out of a String representation to simplify binding the value to a TextBox type control in the UI.
Note
SmartDate is discussed in depth in 16.
Members of the community have created other smart data types such as SmartInt or SmartDouble that provide the same concepts to those other data types. To standardize and simplify the creation of those types, CSLA .NET defines the ISmartField interface. This interface allows CSLA .NET to interact with any smart data type in a consistent manner: Public Interface ISmartField Property Text() As String ReadOnly Property IsEmpty() As Boolean End Interface As you can see, the interface enables both the concept of an empty value and the ability to convert the value into and out of a text representation. Creating a new data type, especially one that extends an existing type such as DateTime or Integer requires a lot of work. The goal is to have the new type work as much like the original as possible, which means overriding many (if not all) operators and providing support for type conversion and cast operations. I discuss some of these challenges in 16 when I cover the implementation of SmartDate.
ISupportUndo Interface
Many smart client UI frameworks enable cancel buttons or similar concepts and thus interact with the n-level undo support provided by CSLA .NET objects. The ISupportUndo interface is designed to make creating these UI frameworks easier by providing a polymorphic interface the UI can use to interact with the objects: Public Interface ISupportUndo Sub BeginEdit() Sub CancelEdit() Sub ApplyEdit() End Interface
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