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ll of the examples in the preceding chapters have demonstrated how to use an application with a specific component. You knew which type to instantiate, which interface to use, and which assembly to reference. In these cases, you, as the developer, are in complete control, and when your application is built, all of the assemblies pop out as a nice, neat package. But what works for the developer might not necessarily work for others. Let s go back to the lighting system presented in 8. We created a kernel that was responsible for turning on and off the lights. The implementations of the individual rooms were in a predetermined assembly with a specific name. This architecture would not work with a third-party library, because the kernel expected an assembly of a certain name. You might be thinking, Heck, that s easy to solve I just delete the old assembly and rename my assembly to match the old name. That technique would work, but it would also be an administrator s nightmare. The solution is to tell the program, For lighting room implementations, look at this assembly and these types. And to give the program this information, you define some text in a file. A file that tells a program to do some task is called a runtime configuration file. This chapter focuses on two areas: using application configuration files and dynamically executing code. A related topic is how much dynamically executed code should be configuration and how much should be convention.

After you ve answered these questions, you can start designing your site, knowing that you re designing for your customers not just doing what seems like a good idea. Determining the answers to these questions also helps ensure that your design covers all the important areas, without massive omissions that will be a nightmare to fix later. The example presented in this book takes a deliberate generic approach to show you the most common e-commerce techniques. To really lift yourself above the competition, however, you don t need fancy features or Flash movies you just need to understand, attract, and serve your customers better than anybody else. Think about this before you launch into designing and building the site itself.

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The question of how to reference and instantiate classes is both philosophical and pragmatic. Consider the architecture shown in Figure 12-1, which is a modular interface and implementation that was presented as an alternative architecture for the lighting system example in 8. In this figure, each of the boxes represents a single assembly: an assembly that contains the interface definitions, an assembly that contains the implementations, and an assembly that contains the kernel. The idea of all of these assemblies is to make it possible to update a single assembly without needing to update all of them. However, what is not indicated in the picture is the fact that your application must be able to reference all three assemblies. If one of those assemblies is missing, you have a problem, because your program cannot function.

All this might make it sound as if your e-commerce business can t possibly fail Well, it s time to take a cold shower and realize that even the best-laid plans often go wrong Some risks are particularly relevant to e-commerce companies, such as Hacking and identity theft Credit card scams Hardware failures Unreliable shipping services Software errors Changing laws You can t get rid of these risks, but you can try to understand them and defend yourself from them The software developed in this book goes some way toward meeting these issues, but many of the risks have little to do with the site itself An important way to defend your site from many risks is to keep backups.

Note If you re consolidating data by position, Excel does not copy the row or column labels in the source

Figure 12-1. How components can be defined The referencing of individual assemblies is not an issue. The issue is how each assembly learns about the others. In previous chapters, I said that you should use a factory, because a factory takes away the decision of what implementation to use. Let s look at this from the perspective of code. Suppose the following interface definition is in an assembly that contains all interface definitions. public interface IMyInterface { } A class that implements the interface is defined in an assembly called implementations. class MyImplementation : IMyInterface { } If a class in another assembly wants to use the functionality of MyImplementation, then this factory is created: public static Factory { public static IMyInterface Instantiate() { return new MyImplementation(); } } Because MyImplementation is not declared as public, the class Factory must be defined in the assembly implementations. This implies that the assembly that uses the functionality has a reference to implementations. Using a factory is acceptable and solves the problem of decoupling so that the user of the implementation does not need to know about the implementation. The user does not have to know the name of the implementation, but does need to know in which assembly the implementation resides. This means when you develop the code, you need to reference the appropriate assembly while coding. This is called source code component architecture in that you decouple the interface from the implementation, but you couple the assemblies.

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