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Even though you have seen numerous examples of these techniques in action, you may still be wondering when to make use of reflection, dynamic loading, late binding, and custom attributes in your programs. To be sure, these topics can seem a bit on the academic side of programming (which may or may not be a bad thing, depending on your point of view). To help map these topics to a real-world situation, you need a solid example. Assume for the moment that you are on a programming team that is building an application with the following requirement: The product must be extendable by the use of additional third-party tools. So, what exactly is meant by extendable Consider Visual Studio 2005. When this application was developed, various hooks were inserted to allow other software vendors to snap custom modules into the IDE. Obviously, the Visual Studio 2005 team had no way to set references to external .NET assemblies it had not programmed (thus, no early binding), so how exactly would an application provide the required hooks First, an extendable application must provide some input vehicle to allow the user to specify the module to plug in (such as a dialog box or command-line flag). This requires dynamic loading. Second, an extendable application must be able to determine whether the module supports the correct functionality (such as a set of required interfaces) in order to be plugged into the environment. This requires reflection. Finally, an extendable application must obtain a reference to the required infrastructure (e.g., the interface types) and invoke the members to trigger the underlying functionality. This often requires late binding.

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You now modify the App.config file on the client project to reflect the usage of transactions, as shown in Listing 9-5. What you are doing here is enabling the transaction flow attribute. Listing 9-5. Modifying the Client App.config <system.serviceModel> <client> <endpoint name="TradeServiceConfiguration" address="http://localhost:8000/TradeService" binding="wsHttpBinding " bindingConfiguration="ReliableHttpBinding" contract="Client.ITradeService,Client"/> </client> <bindings> <wsHttpBinding> <binding name="ReliableHttpBinding" transactionFlow="true"> <reliableSession enabled="true" ordered ="true"/> </binding> </wsHttpBinding> </bindings> </system.serviceModel> Now that this is done, modify the ITradeService interface in the client project. This will then reflect the changes that you will be making to ITradeService later. Listing 9-6 shows the changes. Listing 9-6. Modifying the Client ITradeService <configuration> <system.serviceModel> <bindings> <netTcpBinding> <binding name="transactionalOleTransactionsTcpBinding" transactionFlow="true" transactionProtocol="OleTransactions" /> </netTcpBinding> <wsHttpBinding> <binding name="transactionalWsatHttpBinding" transactionFlow="true" /> </wsHttpBinding> </bindings> <client> <endpoint address="http://localhost:8000/QuickReturns/TradeService" binding="wsHttpBinding" bindingConfiguration="transactionalWsatHttpBinding" contract="ITradeService" name="WSAtomicTransaction_endpoint">

Simply put, if the extendable application has been preprogrammed to query for specific interfaces, it is able to determine at runtime whether the type can be activated. Once this verification test has been passed, the type in question may support additional interfaces that provide a polymorphic fabric to their functionality. This is the exact approach taken by the Visual Studio 2005 team, and despite what you may be thinking, it is not at all difficult.