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ChildChangedEventArgs) The reason for all the extra code is that the backing field for the event needs to be marked as NonSerialized and NotUndoable All events on a Serializable object must be marked with NonSerialized Failure to do this will result in serialization errors if the event is being handled by a nonserializable object such as a WPF Form, a Windows Forms Form, or a Web Forms Page object Similarly, any event declared in an undoable object (one that inherits from UndoableBase or implements IUndoableObject as discussed in 13) must mark the backing field as NotUndoable Failure to do this will result in undo errors during data binding This long form for declaring events allows explicit declaration of the backing field (which is otherwise autogenerated by the compiler): <NonSerialized()> _ <NotUndoable()> _ Private _childChangedHandlers As EventHandler(Of CslaCore.

ChildChangedEventArgs) This declares a delegate field to manage the event handler references and is normally done by the compiler However, since this code is explicit, the declaration can be decorated with the NonSerialized and NotUndoable attributes The result is that the ChildChanged event won t cause problems during serialization, n-level undo, or data binding You should now understand how BusinessBase handles all child PropertyChanged and ListChanged events and raises a ChildChanged event in response..

To understand the difference in the way virtual functions are dispatched on an object while it is constructed, it is necessary to understand the details of virtual function calls on C++ classes and managed classes. Since the CTS does not support multiple inheritance, I will ignore complex multiple inheritance scenarios in the discussion of native virtual functions here. Virtual functions of native classes are dispatched via the famous vtable (virtual function table). A vtable is an array of pointers to virtual functions that a class introduces, inherits, or overrides. In the following code, the class Derived inherits two virtual functions (f1 and f2); one of them is overridden (f2). Furthermore, it introduces the virtual function f3: class Base { public: // Base does not inherit virtual functions

All child objects maintain a reference to their immediate parent object This reference is declared in BusinessBase as NonSerialized and NotUndoable: <NotUndoable()> _ <NonSerialized()> _ Private _parent As CoreIParent The BinaryFormatter and NetDataContractSerializer can handle circular references in an object graph, so I could get away without the NonSerialized attribute However, it has been observed that circular references in an object graph cause a substantial increase in the size of the byte stream that contains the serialized data By using the NonSerialized attribute, I am reducing the size of the serialized data that is often transferred over the network in client/server scenarios The NotUndoable attribute is absolutely required As you ll see in 13, the n-level undo support in CSLA NET doesn t handle circular references, so if this attribute is missing, n-level undo would go into an infinite loop, resulting in a stack overflow exception.

virtual void f1(); virtual void f2(); }; class Derived : public Base { public: virtual void f2(); virtual void f3(); };

Notice that the field type is IParent from the CslaCore namespace All parent objects are required to implement the IParent interface to enable interaction between the child and the parent I discuss IParent later in this chapter The Parent property in BusinessBase is of this type as well: <EditorBrowsable(EditorBrowsableStateAdvanced)> _ Protected ReadOnly Property Parent() As CoreIParent Get Return _parent End Get End Property There s also a SetParent() method, which is invoked by the parent object to set the reference: Friend Sub SetParent(ByVal parent As CoreIParent) _parent = parent End Sub This method is invoked by LoadPropertyValue() when the child object is set into a managed backing field And it is invoked when the parent object is deserialized Remember that the _parent field is NonSerialized, so when the child is deserialized, the value is Nothing.

It must be restored to a meaningful value once deserialization is complete, and that occurs in the parent object s FieldDataDeserialized() method, which is invoked by the OnDeserializedHandler() method The result is that a child object can always get a reference to its immediate parent through its Parent property This reference is used automatically in some cases, as I discuss later in the Parent Editable Collection section..

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