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INotifyCollectionChanged
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C HAPTE R 2 FRA MEWORK DES IGN
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The IBindingList interface is a well-defined interface that (among other things) raises a single event to indicate that the contents of a collection have changed. Fortunately, there s the System. ComponentModel.BindingList<T> base class that already implements this interface, so virtually no effort is required to gain these benefits. As mentioned earlier, INotifyCollectionChanged and the corresponding ObservableCollection<T> class are WPF-only replacements for IBindingList and BindingList<T>. You should only implement one or the other solution, and CSLA .NET uses BindingList<T> to gain support for Windows Forms as well as WPF. The System.ComponentModel.INotifyPropertyChanged and INotifyPropertyChanging interface members are a bit more complex. These interfaces define events that a business object should raise any time a property value is changing or changed. As discussed earlier, in a serializable object, events must be declared using a more explicit syntax than normal so the delegate references can be marked as NonSerialized. The BindableBase class exists to encapsulate this event declaration and related functionality. This acts as the ultimate base class for BusinessBase<T>, while BindingList<T> is the base class for BusinessListBase<T,C>, as shown in Figure 2-12.
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Figure 2-12. Class diagram with BindableBase and BindingList<T> Combined with implementing System.ComponentModel.IEditableObject and System. ComponentModel.IDataErrorInfo in BusinessBase, the objects can fully support data binding in WPF, Windows Forms, and Web Forms. The CSLA .NET list base classes don t support sorting of a collection through IBindingList. They do provide support for LINQ, however, which means you can use LINQ to CSLA queries to sort or filter the items in any CSLA list.
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CHAPTER 2 FRAMEWORK DE SIGN
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Note CSLA .NET does include SortedBindingList and FilteredBindingList classes that provide sorted and filtered views against any collection derived from IList<T> (which in turn means any BindingList<T>). These solutions are obsolete with LINQ but remain in the framework for backward compatibility.
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ExtendedBindingList Class
The list base classes inherit from ExtendedBindingList<T>, which is a specialized subclass of BindingList<T> that adds a couple important features missing from the standard .NET base class. Most notably, it adds the RemovingItem event, which notifies a business object author that a child object is being removed, including providing a reference to the child object. The standard ListChanged event is useful, but it is raised after the child has been removed, and so there s no way to get a reference to the removed child. This class also implements a ChildChanged event. Unlike the PropertyChanged or ListChanged events, the ChildChanged event bubbles up through all parent objects to the root object. This means the UI developer can handle the ChildChanged event on any editable root object to be notified when any child object has been changed. The ExtendedBindingList class also adds an AddRange() method, which makes it easier for a business developer to add multiple items to a collection. This feature is particularly useful when using LINQ to SQL or LINQ to Entities to initialize a collection with data from the data store. Finally, the class implements the IsSelfBusy and IsBusy properties and related functionality required to support the asynchronous object persistence behaviors discussed in 15. The IsBusy property returns true while any asynchronous operation is in progress for this object or objects contained in the collection. The IsSelfBusy property returns true while any asynchronous operation is in progress for this object (but not the child objects it contains). While BindingList<T> does nearly everything required to support data binding, the ExtendedBindingList<T> adds some important features that improve the usability of all CSLA .NET collection base classes.
Business and Validation Rules
Recall that one of the framework s goals is to simplify and standardize the creation of business and validation rules. It also automates the tracking of broken validation rules. An important side benefit of this is that the UI developer will have read-only access to the list of broken rules, which means that the descriptions of the broken rules can be displayed to the user in order to explain what s making the object invalid. The support for tracking broken business rules is available to all editable business objects, so it s implemented at the BusinessBase level in the framework. To provide this functionality, each business object has an associated collection of broken business rules. Additionally, a rule is defined as a method that returns a Boolean value indicating whether the business requirement is met. In the case that the result is false (the rule is broken), a rule also returns a text description of the problem for display to the user. To automate this process, each business object has an associated list of rule methods for each property in the object. Figure 2-13 illustrates all the framework classes required to implement both the management of rule methods and maintenance of the list of broken rule descriptions.
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