ICommandObject Interface in Visual Basic .NET

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ICommandObject Interface
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The final common interface is ICommandObject. Like IReadOnlyCollection, this is an empty interface: Public Interface ICommandObject Inherits IBusinessObject End Interface Again, you can use this interface to easily determine if a business object inherits from CommandBase within your business or UI code.
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ObjectCloner Class
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All read-only and editable objects will implement the System.ICloneable interface. This interface defines a Clone() method that returns an exact copy of the original object. Also remember that all business objects will be mobile objects: marked with the <Serializable()> attribute.
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CHAPTER 3 s BUSINESS FRAMEWORK IMPLEMENTATION
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s The primary reason I m including this cloning implementation is to reinforce the concept that business Tip objects and any objects they reference must be serializable. Having implemented a Clone() method as part of the framework, it becomes very easy to create a test harness that attempts to clone each of your business objects, clearly establishing that they are all totally serializable.
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Creating a clone of a serializable object is easily accomplished through the use of the BinaryFormatter object in the System.Runtime.Serialization.Formatters.Binary namespace. Still, the implementation is a few lines of code. Rather than replicating this code in every base class, it can be centralized in a single object. All the base classes can then collaborate with this object to perform the clone operation. The class contains the following code: Namespace Core Friend Module ObjectCloner Public Function Clone(ByVal obj As Object) As Object Using buffer As New MemoryStream() Dim formatter As New BinaryFormatter() formatter.Serialize(buffer, obj) buffer.Position = 0 Dim temp As Object = formatter.Deserialize(buffer) Return temp End Using End Function End Module End Namespace This code is implemented in a Module, as there is no reason to create an instance of the class. Also notice that it has a scope of Friend, making it only available to classes within the CSLA .NET framework. The Clone() method itself uses the BinaryFormatter to serialize the object s state into an inmemory buffer. All objects referenced by the business object are also automatically serialized into the same buffer. The combination of an object and all the objects it references, directly or indirectly, is called an object graph. The in-memory buffer is immediately deserialized to create a copy of the original object graph. The buffer is then disposed, as it could consume a fair amount of memory, depending on the size of the fields in your objects. The resulting copy is returned to the calling code.
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BindableBase Class
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Editable objects that derive from Csla.BusinessBase will support data binding. One key interface for Windows Forms data binding is System.ComponentModel.INotifyPropertyChanged. This interface simply declares a single event: PropertyChanged. In 2, I discussed the issue of serializing objects that declare events. If a nonserializable object handles the event, then serialization will fail, because it will attempt to serialize
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the non-serializable object. Having just discussed the ObjectCloner class, it is clear that all business objects must be serializable. To avoid this issue, events must be declared in a more complex manner than normal. Specifically, they must be declared using a block structure such that it is possible to manually declare the delegate field. That way, the field can be marked with the <NonSerialized()> attribute to prevent serialization from attempting to serialize a non-serializable event handler. To be slightly more clever, the implementation can maintain two delegate fields, one serializable and one not. As event handlers are added, the code can check to see if the handler is contained within a serializable object or not, and can add the event handler to the appropriate delegate. All this functionality is encapsulated in Csla.Core.BindableBase. This is the base class from which Csla.BusinessBase will ultimately derive. Here s the code: Namespace Core <Serializable()> _ Public MustInherit Class BindableBase Implements System.ComponentModel.INotifyPropertyChanged Protected Sub New() End Sub <NonSerialized()> _ Private mNonSerializableHandlers As PropertyChangedEventHandler Private mSerializableHandlers As PropertyChangedEventHandler <System.Diagnostics.CodeAnalysis.SuppressMessage( _ "Microsoft.Design", "CA1062:ValidateArgumentsOfPublicMethods")> _ Public Custom Event PropertyChanged As PropertyChangedEventHandler _ Implements INotifyPropertyChanged.PropertyChanged AddHandler(ByVal value As PropertyChangedEventHandler) If value.Method.IsPublic AndAlso _ (value.Method.DeclaringType.IsSerializable OrElse _ value.Method.IsStatic) Then mSerializableHandlers = _ DirectCast(System.Delegate.Combine( _ mSerializableHandlers, value), PropertyChangedEventHandler) Else mNonSerializableHandlers = _ DirectCast(System.Delegate.Combine( _ mNonSerializableHandlers, value), PropertyChangedEventHandler) End If End AddHandler RemoveHandler(ByVal value As PropertyChangedEventHandler) If value.Method.IsPublic AndAlso _ (value.Method.DeclaringType.IsSerializable OrElse _ value.Method.IsStatic) Then mSerializableHandlers = DirectCast( _ System.Delegate.Remove( _ mSerializableHandlers, value), PropertyChangedEventHandler)
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