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A common use of interfaces is to allow runtime extensibility, perhaps to allow your users to add their own objects into the system at runtime. You would provide a public interface to your users. Your code would then be written with interface handles internally, so that your users methods are called whenever their type is loaded. To make this work, you need to dynamically load the users assembly, then call some method in that assembly that creates the objects and returns an interface handle with the user s object as the underlying type. You ll use the .NET Framework Assembly class to dynamically load the assembly, and you ll use the .NET Framework reflection functionality to get at the types in the dynamically loaded assembly. Reflection is like a souped-up version of runtime type information (RTTI) in classic C++. It s much more sophisticated than RTTI, mainly because of all the metadata that is tracked by the CLR for .NET Framework types. In fact, reflection is a key reason why writing modern applications is easier with the CLR. Because modern applications often need to be much more extensible than the monolithic applications of the past, you need to interact with types and objects at runtime that you may never have envisioned at compile time. Let s return to our example of an extensible online role-playing game. We want our users to be able to implement their own creatures or monsters within the game. We publish an interface and distribute it in an assembly in our extension kit. Our interface might look something like Listing 9-16. Our assembly would also include any classes that are used in the interface, such as the AnimationSequence2D class, the Attack class, and AttackTypeEnum referred to in Listing 9-16.

The Applications menu contains software for desktop productivity, organized for a regular desktop user. Choices include applications to create documents with the Office submenu and play multimedia files using the Sound & Video submenu. A separate menu item at the bottom lets you add or remove software from the system. Clicking on that menu item bring up the Package Manager window as shown in Figure 6-5, where you can select an application based on its category and remove it if you want. You can also install new software easily within this window. The Browse tab is shown by default, and you can install or remove a package by its category. Select a category on the left pane, check the package name on the right pane to install it or uncheck the package name to uninstall it. Click the Apply button to put your changes into effect.

Figure 6-5. The Package Manager window You can search for packages by clicking on the Search tab, which lets you search for all packages, packages that are installed on your system, or available packages that can be installed. This is shown in Figure 6-6.

Listing 9-16. An Interface to Extend the Monster Game // extension_monster.cpp namespace MonsterExtensions { // public classes AnimationSequence2D, Attack and AttackTypeEnum assumed public interface class IMonster { property String^ Name; property int Strength; property AnimationSequence2D^ Frames; Attack^ GenerateAttack(AttackTypeEnum attacktype); void DefendAttack(Attack^ attack); // etc. }; } Our users implement the interface methods for generating an attack and defending against attacks, and implement all the necessary initialization code to set values for the interface properties, as in Listing 9-17. Listing 9-17. Implementing the Monster Game Interface // mymonster.cpp #using "extension_monster.dll" using namespace System; using namespace MonsterExtensions; public ref class MyMonster : IMonster { public: virtual property String^ Name; virtual property int Strength; virtual property AnimationSequence2D^ Frames;

ne of the things that I decided when I began outlining the contents for this book was that I wanted the book to be approachable by all developers, regardless of their exposure to BizTalk and its corresponding tool set. Because I truly desire to have you build Foundation skills with this guide, I believe that I should cover even the most basic details of the BizTalk product. And the most basic component for BizTalk Server 2006 is the XML message. XML is the language of choice for data going in and coming out of the BizTalk messaging engine. To work fluently with BizTalk, you need to have a basic understanding of the XML language. I ve read a plethora of .NET books that deal with XML syntax in some fashion, and typically, the authors seemed to take for granted that the reader has a full and comprehensive grip on the language. Unfortunately for those authors (and their readers as well), not everyone has had a chance to work with XML and build up that skill set. But I want to break that cycle. I want you to boldly jump into this book, without fear of the XML monster. And so we ll spend this chapter examining XML its syntax and design. If you ve worked with the language before, feel free to skim through these pages, making sure that you don t have any knowledge gaps before you proceed with the rest of the book.

Figure 6-6. The Search tab of the Package Manager window From Figure 6-6, you can give the full name or partial name of the package you want to find in the search box. Clicking the Search button will start the search. You can filter the results by all packages,

virtual Attack^ GenerateAttack(AttackTypeEnum attacktype) { // Generate an attack. return gcnew Attack(/* attack details go here */); }

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