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CHAPTER 5 CSLA . NET OBJECT TEMPLATES
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In the constructor, you need to give data binding permission to add new items to the collection by setting the AllowNew property. private EditableRootList() { /* Require use of factory methods */ AllowNew = true; } When you do this, you also must override the AddNewCore() method. This method is defined by the .NET collection base class from which BusinessListBase inherits, and it is this method that is responsible for creating a new child object and adding it to the collection when requested by data binding. The override looks like this: protected override EditableChild AddNewCore() { var item = EditableChild.NewEditableChild(); Add(item); return item; } The method must perform three tasks: create the object, add it to the collection, and return the object as a result. Notice that no parameter is provided to AddNewCore(). This means that you must be able to create new child objects without providing any criteria or other information. Usually this is not a problem, but if the only way to create your new child object is with some criteria information, then you won t be able to enable this feature of data binding.
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The most common type of collection is one that is contained within a parent object to manage a collection of child objects for that parent for example, ProjectResources and ResourceAssignments in the sample application.
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Tip Note that the parent object here might be a root object, or it might be a child itself. Child objects can be nested, if that s what the business object model requires. In other words, this concept supports not only root-tochild, but also child-to-grandchild and grandchild-to-great-grandchild relationships.
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A child collection class inherits from BusinessListBase and has factory methods that use the CreateChild() and FetchChild() data portal methods, so the object is marked as a child when it is created. If you choose to avoid the data portal for creating the child object, you must make sure MarkAsChild() is called during the object s creation process to indicate that it s operating in child mode. Remember that child objects are not retrieved or updated directly by the UI, but instead are retrieved or updated by the child object s parent object. [Serializable] public class EditableChildList : BusinessListBase<EditableChildList, EditableChild> { #region Factory Methods
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CH A PT ER 5 C SLA .NET O BJECT T EMPLAT ES
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internal static EditableChildList NewEditableChildList() { return DataPortal.CreateChild<EditableChildList>(); } internal static EditableChildList GetEditableChildList( object childData) { return DataPortal.FetchChild<EditableChildList>(childData); } private EditableChildList() { } #endregion #region Data Access private void Child_Fetch(object childData) { RaiseListChangedEvents = false; foreach (var child in (IList<object>)childData) this.Add(EditableChild.GetEditableChild(child)); RaiseListChangedEvents = true; } #endregion } As you can see, this code is similar to a root collection in structure, though there is no Authorization Rules region. The factory methods are somewhat different, because they are scoped as internal and call the child data portal methods. Notice that the GetEditableChildList() method requires that the parent provide a preloaded object containing the data for the list s child objects. It is less efficient, but possible, for the child list to go directly to the database in its Child_Fetch() method and load its own data, but typically the parent object provides this data, as mocked up here. The Data Access region contains a Child_Fetch() method, which is responsible for creating all child objects by calling their factory methods, and adding those objects to the collection. As with any collection, the RaiseListChangedEvents property is set to false first, and to true when complete to prevent a flood of unnecessary ListChanged events during the data-retrieval process. The BusinessListBase class contains a default implementation for Child_Update() that automatically calls the right Child_XYZ method on all child objects of the list when the list is saved. Normally this implementation is sufficient, but you can override Child_Update() to customize that behavior if required for some unusual edge case. As with an editable root collection, you can set AllowNew to true and override AddNewCore() if you want data binding to add new items to the collection automatically.
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