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This chapter is all about discovering information about types, creating instances of them, and accessing their members when you didn t know anything about them at compile time . The information in this chapter is typically used to create a dynamically extensible application . This is the kind of application for which one company builds a host application and other companies create add-ins to extend the host application . The host can t be built or tested against the add-ins because the add-ins are created by different companies and are likely to be created after the host application has already shipped . This is why the host needs to discover the add-ins at runtime . A dynamically extensible application could take advantage of common language runtime (CLR) hosting and AppDomains as discussed in 22, CLR Hosting and AppDomains . The host could run the add-in code in an AppDomain with its own security and configuration settings . The host could also unload the add-in code by unloading the AppDomain . At the end of this chapter, I ll talk a little about how to put all of this stuff together CLR hosting, AppDomains, assembly loading, type discovery, type instance construction, and reflection in order to build a robust, secure, dynamically extensible application .

Figure 9-1. A solution for the bill of materials problem Notice that for the solution on the left-hand side, if you replaced the entity name PART with THING, and you replaced the two relationship descriptions with related to, then you would have the ultimate in generic data models! Although this book is not about database design, consider this joke as a serious warning: don t make your data models overly generic. Even if hierarchical data structures are correctly translated into relational tables, the retrieval of such structures can still be quite challenging. We have an example of a simple hierarchical relationship

If you encounter a problem completing an exercise, you can find the completed projects in the samples installed from this book s companion CD. For more information about the project files and other content on the CD, see Using the Companion Media in this book s Introduction.

After learning about the three-tier architecture and implementing a bit of your web site s main page, it s time to continue your work by starting to create the HatShop product catalog. Because the product catalog is composed of many components, you ll create it over two chapters. In 3, you ll create the first database table and implement the data access code. By the end of this chapter, you ll have something dynamically generated on your web page.

The implementation reveals an implicit contract between the component and the HTML markup for the reader. The component is constructed with an ID that it stores in its this.id attribute. The ID is then used as a prefix to find various elements within the markup. In this case, the IDs of the buttons are assumed to be the ID passed into the constructor, followed by _prevBtn, _nextBtn, _pauseBtn, and addBtn. To illustrate this, in the example construction just mentioned that uses rssReader for the ID, the component expects the buttons to be specified as follows:

displayed when an article is being edited, a contributor may select the use of any language currently available on the Joomla system from the Content Language dropdown list.

This is the table lookup that calls a routine depending on the type of the field just by looking it up in a table of objects.

instance of the type:

So far in this chapter, the use of delegates has required that the developer know up front the prototype of the method that is to be called back. For example, if feedback is a variable that references a Feedback delegate, then to invoke the delegate, the code would look like this:

The .NET reader and writer classes are functionally similar to those in Java. The Java classes were introduced to provide character-based streams to better support internationalization, and implementations include both base and pass-through streams. The .NET reader and writer classes are also character oriented but can't be used as pass-through streams. No base classes exist for the .NET readers and writers; each implementation stands alone, meaning that the programmer can't cast to a single abstract type. The classes described in this section most closely resemble the Java I/O model, implementing a division of responsibility between reading and writing data.

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