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As we saw in the preceding section, Visual Studio can generate assemblies containing .NET representations of type information from COM type libraries. These assemblies are called interop assemblies. There s a potential problem here: what happens if multiple developers all generate interop assemblies for the same COM component Most of the time this will be OK, because these duplicates will be in separate applications. However, what if you have two .NET libraries that both use the same COM component For example, suppose you are building a document processing system that uses Microsoft Word s COM API. If your system includes two libraries, both of which need to use Word, the developers of those libraries would add COM references, and you d end up with two interop assemblies for Word. But if a single application uses both of those libraries, you would end up with two different interop assemblies for the same COM types in the same process. This is a problem, because there would be two different representations for what is supposed to be the same type.

The next step is creating the quota files, which will be used to store quota limits for the users and groups, as well as current disk usage, in the filesystem. You will be using the quotacheck utility to manage quota files and examine disk usage in the filesystem. Particularly, you will be running quotacheck cugv /home, where /home is the target filesystem, c performs a new scan on the target filesystem and stores disk usage information in quota files, -u performs the scan for user usage, g performs the scan for group usage, and v gives you verbose information on running the command. You should see output similar to Listing 5-3.

Word s COM API supports automation, which means we could use the dynamic keyword shown in 18. This removes the need for interop assemblies, sidestepping the problem. However, some parts of Word s API fit perfectly well with static typing, which means developers may choose not to use dynamic, letting them take advantage of IntelliSense and additional compile-time checks. Or the code may have been written before dynamic was introduced in C# 4.0.

To avoid having multiple .NET types for one COM type, the author of a COM component can provide a primary interop assembly (PIA). For example, Microsoft provides PIAs for the Office suite if you look in the .NET tab of the Add Reference dialog, you will find assemblies whose names begin Microsoft.Office.Interop. The PIA for Word is Microsoft.Office.Interop.Word. If you have multiple components in a single application that all use Word, then as long as they use the PIA, they ll all agree on how each Word COM type is represented in .NET. The one problem with PIAs is that installing them on the target machine can be problematic. They re fairly big the Office 2007 PIA installer is 6.3 MB. Integrating them into your installation process also requires additional work. These are not showstoppers, but they certainly add significant complexity. This is why C# 4.0 provides a simpler alternative, known informally as no PIA.

.NET 4 adds a new feature to the type system, type equivalence, which makes it possible for two different type definitions to be treated as though they are the same type. This makes it possible to do without PIAs at runtime if all interop assemblies are equal, there s no need for a primary one.

Listing 5-3. Creating Quota Files [root@server ~]# quotacheck -cugv /home quotacheck: Scanning /dev/hda3 [/home] done quotacheck: Checked 11 directories and 12 files The quota files will be stored as aquota.user and aquota.group in the filesystem. Users should be able to read these files so that they can check their quotas themselves by running the quota command. To make these files readable, just issue the commands chmod o+r aquota.user and chmod o+r aquota.group.

Although type equivalence makes this possible, it s an opt-in feature. For two types to be equivalent, they must have the same structure, and they must be marked with the TypeIdentifier custom attribute. (Attributes are discussed in 17.) So this new feature does not change the behavior of existing code.

C# 4.0 s no-PIA feature exploits type equivalence: you can embed interop type information in your assembly, avoiding the need for a separate interop assembly of any kind. When your project has a reference to a PIA such as Microsoft.Office.Interop.Word, Visual Studio works out which types your code really uses, and copies them into the compiled output, adding the necessary annotations to enable type equivalence. Even though the project has a reference to the PIA, your compiled assembly does not it contains all the information it needs.