Root Object Creation in Visual Basic .NET

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Root Object Creation
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Root objects are created by calling a factory method, which is a method that s called in order to create an object. These will be Shared methods on the class. The Shared method will use the data portal to load the object with default values. The following steps outline the process of creating a new root object: 1. The factory method is called. 2. The factory method calls DataPortal.Create() to get the business object. 3. The data portal uses its channel adapter and message router functionality as described in 4; the result is that the data portal creates a new instance of the business object. 4. The business object can do basic initialization in the constructor. 5. The DataPortal_Create() method is called, and this is where the business object implements data access code to load its default values. 6. The business object is returned. 7. From the business object s perspective, two methods are called, as follows: The default constructor DataPortal_Create() This is illustrated in Figure 7-1. If the object doesn t need to retrieve default values from the database, the <RunLocal()> attribute can be used to short-circuit the data portal so the object initialization occurs locally. To the UI code, of course, there s no difference that code just calls the factory method and gets an object back: Dim root As Root = Root.NewRoot() From the business object s perspective, most of the work occurs in the DataPortal_Create() method, where the object s values are initialized.
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CHAPTER 7 s USING THE CSLA .NET BASE CLASSES
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Figure 7-1. Creating a root object
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Child Object Creation
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Child objects are usually created when the UI code calls an Add() method on the collection object that contains the child object. Ideally, the child class and the collection class will be in the same assembly, so the Shared factory methods on a child object can be scoped as Friend, rather than Public. This way, the UI can t directly create the object, but the collection object can create the child when the UI calls the collection s Add() method. The CSLA .NET framework doesn t actually dictate this approach. Rather, it s a design choice on my part because I feel that it makes the use of the business objects more intuitive from the UI developer s perspective. It s quite possible to allow the UI code to create child objects directly, by making the child factory methods Public; the collection s Add() method would then accept a prebuilt child object as a parameter. I think that s less intuitive, but it s perfectly valid, and you can implement your objects that way if you choose.
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Child objects can optionally be created through data binding, in which case the addition is handled by overriding the AddNewCore() method in the collection class.
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As with the root objects, you may or may not need to load default values from the database when creating a child object.
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s If you don t need to retrieve default values from the database, you could have the collection object create Tip the child object directly, using the New keyword. For consistency, however, it s better to stick with the factory method approach so that all objects are created the same way.
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The steps to create a child object that doesn t need to load itself with default values from the database are as follows:
CHAPTER 7 s USING THE CSLA .NET BASE CLASSES
1. The factory method (Friend scope) is called. 2. The factory method creates the object locally by using the New keyword and possibly passing parameter values. 3. The child object does any initialization in the constructor method. 4. The child object is returned. 5. From the child object s perspective, only one method is called, as follows: Any constructor This is illustrated in Figure 7-2.
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