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SQL s trivalue logic may be awkward, but it is a standard, and working around it with the is operator will likely have you encountering problems with other systems and programming languages that expect the standard behavior..

Private Shared Sub AddObjectAuthorizationRules() ' TODO: add authorization rules 'AuthorizationRules.AllowGet(GetType(DynamicRootList), "Role") 'AuthorizationRules.AllowEdit(GetType (DynamicRootList), "Role") End Sub #End Region #Region "Factory Methods" Public Shared Function NewDynamicRootList() As DynamicRootList Return DataPortal.Create(Of DynamicRootList)() End Function Public Shared Function GetDynamicRootList() As DynamicRootList Return DataPortal.Fetch(Of DynamicRootList)() End Function Private Sub New() ' require use of factory methods AllowNew = True End Sub #End Region #Region "Data Access" Private Sub DataPortal_Fetch() ' TODO: load values RaiseListChangedEvents = False Dim listData As Object = Nothing For Each item In DirectCast(listData, List(Of Object)) Add(DynamicRoot.GetDynamicRoot(item)) Next RaiseListChangedEvents = True End Sub #End Region End Class As with an editable root collection, you can set AllowNew to True and override AddNewCore() if you want data binding to automatically add new items to the collection. This template includes that functionality, because the typical use of a dynamic collection is to allow the user to add, edit, and remove objects. The Authorization Rules region is the same as you ve seen in the other root templates. The Factory Methods region allows the creation of an empty collection or the retrieval of existing data through two different factories. The Data Access region includes the DataPortal_Fetch() method, which is responsible for calling the Data Access layer to get all the data for the objects that will be in the collection. This is the same kind of code you saw for the editable root collection stereotype. What is interesting here is that the child objects being loaded are actually editable root objects. In the next section, I ll discuss the dynamic editable root stereotype. You ll be able to see how the GetDynamicRoot() factory method is implemented.

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For example, this XAML defines a Save button: <Button Command="ApplicationCommandsSave" CommandTarget="{Binding Source={StaticResource Project}, Path=CommandManager, BindsDirectlyToSource=True}" HorizontalAlignment="Left" IsDefault="True">Save</Button> Notice how the CommandTarget property is specified The Source is a CslaDataProvider control, but the binding path indicates that the command should be routed to the data provider control s CommandManager property, which is an instance of CslaDataProviderCommandManager In CslaDataProviderCommandManager is a SaveCommand() method that is invoked by the WPF commanding infrastructure when the Button control is clicked: Private Shared Sub SaveCommand(ByVal target As Object, _ ByVal e As ExecutedRoutedEventArgs) Dim ctl = TryCast(target, CslaDataProviderCommandManager) If ctl IsNot Nothing AndAlso ctlProvider IsNot Nothing Then ctlProviderSave() End If End Sub The CslaDataProviderCommandManager has a Provider property, which is a reference to its parent CslaDataProvider control You can see how this code delegates the call to its parent: ctlProvider.

The coalesce function, which is part of the SQL99 standard, takes a list of values and returns the first non-null in the list. Take the following example: select coalesce(null, 7, null, 4) In this case, coalesce will return 7 as the first non-null value. This is also handy when performing arithmetic, so you can detect whether null has been returned and return a meaningful value like 0 instead. Conversely, the nullif function takes two arguments and returns null if they have the same values; otherwise, it returns the first argument: sqlite> select nullif(1,1); null sqlite> select nullif(1,2); 1 If you use null, you need to take special care in queries that refer to columns that may contain null in their predicates and aggregates. null can do quite a number on aggregates if you are not careful.

WCF is an exciting technology because it unifies all of the concepts that have been presented throughout this book. Developers today must contend with a variety of different technology choices for building distributed applications, including XML Web services (.asmx) Web Services Enhancements (WSE) .NET Remoting MSMQ (provided by the .NET Framework System.Messaging namespace) Enterprise Services (the .NET Framework namespace for COM+) These various technologies overlap and complement each other in different ways. In many cases an application requirement can be fulfilled with two or more of these technologies. Perhaps the clearest example of a potential overlap is with XML Web services and .NET Remoting. Both technologies operate on the same principle, namely that they facilitate

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