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If a business object is retrieved using a remote data portal configuration, the business object will be created and loaded on the server. It s then returned to the client. The result, however, is that there s a copy left in memory on the server. Because of this, there s no way to call the business object s Dispose() method on the server. To avoid this scenario, any time that the data portal may be configured to run outside the client process, the business object designs must avoid any requirement for a Dispose() method.

It is also possible to load assemblies via explicit APIs. This is especially helpful for applications that support plug-ins. There is a variety of static functions in System::Reflection::Assembly that can be used to load an assembly dynamically. The two most important ones are as follows: Assembly^ Assembly::Load(String^ assemblyName); Assembly^ Assembly::LoadFrom(String^ url); Assembly::Load expects a string with the four-part assembly name as an argument. To determine the code base to the assembly, the assembly resolution algorithm is used in the same way as it is used for assemblies loaded during JIT compilation. Assembly::LoadFrom expects a string specifying a file name or a path to the assembly. This API is often used for unit tests. LoadFrom does not simply load the assembly from the specified location. Instead, it first opens the assembly file to determine the assembly s four-part assembly name. This assembly name is then passed to the assembly resolution algorithm. If an assembly is found via assembly resolution, the assembly will be loaded from the resolved location. Otherwise, the assembly will be loaded from the specified path. Even though this behavior sounds strange, it can prevent two assembly files with the same identity from being loaded. These problems existed in earlier versions of the CLR, in which LoadFrom simply loaded the assembly from the specified location.

At times, applications need to retrieve a collection of child objects directly. To do this, you need to create a root collection object. For instance, the application may have a WPF UI consisting of a ListBox control that displays a collection of Contact objects. If the root object is a collection of child Contact objects, the UI developer can simply bind the collection to the ListBox (with an appropriate data template), and the user can edit all the objects in the list.

This approach means that all the child objects are handled as a single unit in terms of data access. They are loaded into the collection to start with, so the user can interact with all of them and then save them as a batch when all edits are complete. This is only subtly different from having a regular root object that has a collection of child objects. Figure 5-1 shows the regular root object approach on the left and the collection root object approach on the right.

The .NET-specific extensions to the PE format have surprising similarities to databases. Like a normal database, assemblies contain tables. These tables are called metadata tables. Metadata tables exist for type definitions, method definitions, and many other abstractions. Like database tables, each metadata table has a column structure specific for the abstraction. The structures for all tables start with a 32-bit column called a metadata token. Such a metadata token can be compared to a primary key in a database table. To establish relationships between the different abstractions stored in metadata tables, an approach similar to using foreign keys in databases is used: the structure of various metadata tables contains columns that store metadata tokens of other tables. As an example, since there is a one-to-n relationship between type definitions and methods (a type can have an arbitrary number of methods), there is a column for the parent type in the metadata table for methods. The Managed Reflection API also contains classes for all kinds of abstractions that can be stored in the metadata of assemblies. These abstractions include type definitions, methods (global functions as well as member functions of a managed type), and fields (member variables). All these types are semantically bound together via has-a relationships. An assembly has type definitions, type definitions have fields and methods, methods have parameters, and

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