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As with IsSelfDirty, there s a Protected method to allow the object to be marked for deletion when necessary: Protected Sub MarkDeleted() _isDeleted = True MarkDirty() End Sub Of course, marking the object as deleted is another way of changing its data, so the MarkDirty() method is called to indicate that the object s state has been changed.
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Delete and DeleteChild Methods
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The MarkDeleted() method is called from the Delete() and DeleteChild() methods. The Delete() method is used to mark a non-child object for deferred deletion, while DeleteChild() is called by a parent object (such as a collection) to mark the child object for deferred deletion: Public Sub Delete() If Me.IsChild Then Throw New NotSupportedException(My.Resources.ChildDeleteException) End If MarkDeleted() End Sub Friend Sub DeleteChild() If Not Me.IsChild Then Throw New NotSupportedException(My.Resources.NoDeleteRootException) End If MarkDeleted() End Sub Both methods do the same thing: call MarkDeleted(). But Delete() is scoped as Public and can be called only if the object is not a child object (a topic covered in the discussion about parent and
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CHAPTER 8 OBJECT S TA TUS MA NAGE MENT
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child object behaviors in 9). Conversely, DeleteChild() can be called only if the object is a child. Since it is intended for use by BusinessListBase, it is scoped as Friend. At this point, you should have a good understanding of the various object status values managed by BusinessBase and BusinessListBase.
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Conclusion
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In this chapter, I continued discussing the implementation of the CSLA .NET framework. This chapter covered the object status values maintained by editable objects, allowing the rest of CSLA .NET, your business code, and your UI code to interact with your objects in a standardized manner. All editable objects maintain the following status values: IsSelfDirty IsDirty IsSelfValid IsValid IsNew IsSavable IsDeleted Some of these values are important to parent-child relationships, as discussed in 9. Others rely on validation and authorization, as discussed in s 11 and 12. And many of them are used by the data portal as discussed in 15.
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Parent-Child Relationships
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n 6, I started walking through the framework implementation. 7 covers how to declare properties, including properties that reference child objects, and 8 focuses on how object status values are tracked, including some interaction with child objects. The idea of child objects is introduced in 3. A child object is contained by a parent object. Conversely, a parent object is an object that contains one or more child objects. The topmost parent of a group of objects is the root object, and that is the object that can be directly retrieved or updated into the database. Any child objects contained by that root object are retrieved or updated at the same time, a topic I cover in 15. Although many of the details of parent and child objects are covered in other chapters, this chapter recaps the concepts, consolidating them into one location for easy reference. First I talk about child properties of an editable object; then I talk about how editable collections work because they contain an entire list of child objects.
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Parent Editable Object
One common scenario is to have an editable object be a parent of other objects. In many cases, the root object is also an editable object, as shown in Figure 9-1.
Figure 9-1. Parent with single child A parent object may also contain a child collection, as shown in Figure 9-2.
CHAPTER 9 PARE NT-C HILD RELATION SHIPS
Figure 9-2. Parent with single collection In Figure 9-2 there are actually two parent objects. The Root object is the parent of ChildList, which is the parent of several Child objects. I discuss parent collections later in the chapter in the Parent Editable Collection section. For now let s focus on the editable object as a parent.
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