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Figure 5-1. Comparing simple root objects (left) and collection root objects (right) This approach isn t recommended when there are large numbers of potential child objects, because the retrieval process can become too slow. However, it can be useful in cases where you can specify criteria to limit the number of objects returned. To create an editable root collection object, use a template like this: <Serializable()> _ Public Class EditableRootList Inherits BusinessListBase(Of EditableRootList, EditableChild) #Region "Authorization Rules" Private Shared Sub AddObjectAuthorizationRules() ' TODO: add authorization rules 'AuthorizationRules.AllowGet(GetType(EditableRootList), "Role") End Sub #End Region #Region "Factory Methods" Public Shared Function NewEditableRootList() As EditableRootList Return DataPortal.Create(Of EditableRootList)() End Function Public Shared Function GetEditableRootList( _ ByVal id As Integer) As EditableRootList Return DataPortal.Fetch(Of EditableRootList)(New _ SingleCriteria(Of EditableRootList, Integer)(id)) End Function Private Sub New() ' Require use of factory methods End Sub

#End Region #Region "Data Access" Private Sub DataPortal_Fetch(ByVal criteria _ As SingleCriteria(Of EditableRootList, Integer)) RaiseListChangedEvents = False ' TODO: load values into memory Dim childData As Object = Nothing For Each item In DirectCast(childData, List(Of Object)) MeAdd(EditableChildGetEditableChild(item)) Next RaiseListChangedEvents = True End Sub #End Region End Class The Authorization Rules region implements the AddObjectAuthorizationRules() method to define the roles that can interact with the object This is the same as with an editable root object, and the UI developer can use this information to enable and disable UI elements accordingly Also, the data portal uses these rules to ensure only authorized users are able to create, get, edit, or delete the collection object The one difference is that this AddObjectAuthorizationRules() method only needs to define the roles allowed to get the object The Factory Methods region implements factory methods to create, retrieve, and (optionally) delete the collection.

so on. To navigate from one type to another one, each of these types offers functions with the prefix Get. The following code uses Assembly::GetTypes to iterate through all type definitions of an assembly: // dumpAssemblyTypes.cpp // build with "CL /clr:safe dumpAssemblyTypes.cpp" using namespace System; using namespace System::Reflection; int main( array<String^>^ args) { for each (String^ url in args) { Assembly^ a = Assembly::LoadFrom(url); Console::WriteLine(a->Location); for each (Type^ t in a->GetTypes()) { Console::WriteLine(t); Console::WriteLine("Base class: {0}", t->BaseType); if (t->IsValueType) Console::WriteLine("This is a value type"); } } } Assembly::GetTypes returns an array of System::Type handles. Instances of System::Type are called type objects. Each handle refers to a type object that describes a public type of the assembly. System::Type allows you to find out almost everything about a type, including its name, base class, and supported interfaces. When a handle to a type object is passed to Console::WriteLine, then Type s overload for ToString is called. Type::ToString simply returns the namespace-qualified type name. However, the string returned is not a C++-like type name, but a language-neutral type name. Since most .NET languages use the dot character (.) as a namespace separator, Type::ToString does the same. There are various ways to get a type information object. As mentioned before, System::Object has a function called GetType(). Using this method, you can easily find out the type of any managed object and of any managed value. If the requested type is known at build time, the keyword typeid can be used. The following code checks if an object passed is of type String: bool IsString(Object^ o) { return o != nullptr && o->GetType() == String::typeid; }

The methods rely on the data portal to do much of the work, ultimately delegating the call to the appropriate DataPortal_XYZ method In the Data Access region, the DataPortal_Fetch() method is responsible for getting the data from the database using whatever data access technology you choose This is often LINQ to SQL, the ADONET Entity Framework, or raw ADONET In any case, the Data Access layer must return the child data as a result so it can use it to load each individual child object with data You load each child object by calling the child object s factory method, passing the object s data as a parameter The resulting child object is added to the collection The DataPortal_Fetch() method sets the RaiseListChanged Events property to False before changing the collection and then restores it to True once the operation is complete.

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