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As mentioned previously, delegates support multicasting. For delegate definitions, C++/CLI defines classes that are derived from System::MulticastDelegate, which itself extends System::Delegate. System::MulticastDelegate acts as a linked list of delegates. System::Delegate provides methods that can be used to create and control multicast delegates. As an example, you can combine two delegates into a multicast delegate: SampleDelegate^ dCombined; dCombined = safe_cast<SampleDelegate^>(Delegate::Combine(d1, d2)); Another option to combine delegates is to use the += operator: SampleDelegate^ dCombined2 = nullptr; dCombined2 += d1; dCombined2 += d2;

You create a read-only child object using the same code as that for a read-only root object. The only difference is how you handle the data portal and data access.

<Serializable()> _ Public Class ReadOnlyChild Inherits ReadOnlyBase(Of ReadOnlyChild) #Region "Business Methods" ' TODO: add your own fields, properties, and methods ' example with managed backing field Private Shared IdProperty As PropertyInfo(Of Integer) = _ RegisterProperty(New PropertyInfo(Of Integer)("Id", "Id")) Public ReadOnly Property Id() As Integer Get Return GetProperty(IdProperty) End Get End Property ' example with private backing field Private Shared NameProperty As PropertyInfo(Of String) = _ RegisterProperty(New PropertyInfo(Of String)("Name", "Name")) Private _name As String = NameProperty.DefaultValue Public ReadOnly Property Name() As String Get Return GetProperty(NameProperty, _name) End Get End Property #End Region #Region "Factory Methods" Friend Shared Function GetReadOnlyChild(ByVal childData _ As Object) As ReadOnlyChild Return DataPortal.FetchChild(Of ReadOnlyChild)(childData) End Function Private Sub New() ' require use of factory methods End Sub #End Region #Region "Data Access" Private Sub Child_Fetch(ByVal childData As Object) ' TODO: load values from childData End Sub #End Region End Class As with a root object, a read-only child object should have read-only properties only. And as with an editable child, the factory method and data access method assume the parent object will be providing the preretrieved data needed to load the object s fields.

When the += operator is used, the C++/CLI compiler generates IL code that calls Delegate::Combine to combine both delegates and assigns the result to the left-hand side of the operation. In a similar way, the -= operator calls Delegate::Remove to remove a delegate from the invocation list of a multicast delegate. When a multicast delegate like dCombined is invoked, both targets are invoked sequentially. The return value and output arguments of a multicast invocation are determined by the last invocation; however, you should not make assumptions about the invocation order. If you are interested in the outcome of every single invocation, call the helper function GetInvocationList, which the delegate type inherits from its base class, System::Delegate. GetInvocationList returns an array of single-cast delegates one for every target of the multicast delegate.

There s a corresponding MarkDirty() method as well. This method is called from various points in an object s lifetime, including any time a property value is changed or when the MarkNew() method is called. When a property value is changed, a specific PropertyChanged event is raised for that property. If MarkDirty() is called at other times, when a specific property value isn t changed, the PropertyChanged event for all object properties should be raised. That way, data binding is notified of the change if any object property is bound to a UI control. To be clear, the goal is to ensure that at least one PropertyChanged event is raised any time the object s state changes. If a specific property is changed, the PropertyChanged event should be raised for that property. But if there s no way to tell which properties are changed (like when the object is persisted to the database), there s no real option but to raise PropertyChanged for every property. Implementing this requires a couple of overloads of the MarkDirty() method: Protected Sub MarkDirty() MarkDirty(False) End Sub <EditorBrowsable(EditorBrowsableState.Advanced)> _ Protected Sub MarkDirty(ByVal suppressEvent As Boolean) _isDirty = True If Not suppressEvent Then OnUnknownPropertyChanged() End If End Sub

The first overload can be called by a business developer if she wants to manually mark the object as changed. This is intended for use when unknown properties may have changed.

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