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Assemblies are a self-describing collection of functionalities stored in an intermediate language and/or resources needed to execute some portion of an application. Assemblies are made up of four sections: the assembly metadata, type metadata, Microsoft intermediate language (MSIL) code, and resources (Figure 1-2). All sections except the assembly metadata are optional, though an assembly made up of just assembly metadata sections won t do anything. Assemblies can be either private or shared. Private assemblies reside in the same directory as the application itself or in one of its child directories. Shared assemblies, on the other hand, are stored in the global assembly cache (GAC). The GAC is really nothing more than a directory structure that stores all the assemblies that are globally available to the computer (Figure 1-3). A neat feature of the GAC is that more than one version of the same assembly can reside in it.

Changing contracts is a tricky situation no matter how careful you are You can change contracts in many ways by adding, removing, or modifying and you can cause many issues on both ends of the wire These can range from obvious issues where an exception is thrown, to more complex ones where the data may lack integrity and not make sense Figure 11 2 shows a versioning decision tree that you can use to predict the effects of any changes applied to the data contracts The versioning decisions are depicted with diamonds, and the actions based on those decisions are represented as rectangles The arrows represent the direction of the flow The dark-gray actions represent nonbreaking changes, and light-gray ones show breaking changes Let s take an example service and walk through the flowchart.

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Because the MSDN documentation contains detailed information about each of these applications the information will not be re-presented here.

Figure 1-3. The global assembly cache A key feature of all assemblies is that they are self-describing. In other words, all information needed to understand how to use the assembly can be found within the assembly itself. An assembly does this by including metadata directly within itself. There are two different metadata sections in an assembly: the assembly metadata and the type metadata. You gain access to this metadata using reflection, which I cover in 18.

The assembly metadata is also known as the assembly manifest. As its name suggests, the assembly metadata describes the assembly. Here is a list of some of the assembly metadata s contents: The name of the assembly. The version number. The culture used by the assembly (i.e., language, currency, number formatting, and so on). Strong name information. This is a uniquely identifiable name that can be used for shared assemblies. A list of all files that make up the assembly. A list of all reference assemblies. Reference information for all exported classes, methods, properties, and so on, found in the assembly.

When you need to modify your existing service and can do so by adding a new service, then the easiest way is to use service contract inheritance This new type will point to a new endpoint, which only the new consumers of this service will be aware of; the existing consumers will continue using the existing published version of the service However, if this is not an option, then changing the data contract may be difficult If you need to add more data, the easiest option is to add new optional data members (as shown in Figure 11 2) If adding new members is not an option and you need to change the service operation and its corresponding data contract, then, as shown in the decision tree, it is best to implement a new version of the data contract (depicted as v.

To find information about these applications in the MSDN documentation, go to its table of contents, Tip navigate to Visual Studio Team System Team Edition for Developers Analyzing Application Performance Command-Line Tools.

The type metadata, however, describes the types within the assembly. The type metadata generated depends on the type being created. On the one hand, if the type were a method, then the metadata generated would contain things such as the name, return types, number of arguments and their types, and access level. A property, on the other hand, would reference the get and set methods; these methods in turn would contain names, return types, and so on. A nice feature of metadata is that it can be used by many of the tools available to the C++/CLI developer. For example, Visual Studio .NET s IntelliSense statement completion functionality (Figure 1-4) is actually driven using the reference assembly s metadata and not some secondary description file. Because it comes directly from an assembly, IntelliSense will also work for assemblies you have written yourself without any additional effort on your part.

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