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Now that you know how to apply a custom attribute, let s find out what an attribute really is . A custom attribute is simply an instance of a type . For Common Language Specification (CLS) compliance, custom attribute classes must be derived, directly or indirectly, from the public abstract System.Attribute class . C# allows only CLS-compliant attributes . By examining the .NET Framework SDK documentation, you ll see that the following classes (from the earlier example) are defined: StructLayoutAttribute, MarshalAsAttribute, DllImportAttribute, InAttribute, and OutAttribute . All of these classes happen to be defined in the System.Runtime.InteropServices namespace, but attribute classes can be defined in any namespace . Upon further examination, you ll notice that all of these classes are derived from System.Attribute, as all CLS-compliant attribute classes must be . Note When applying an attribute to a target in source code, the C# compiler allows you to

Another approach is to integrate one feature at a time. The term feature doesn t refer to anything fancy just an identifiable function of the system you re integrating. If you re writing a word processor, a feature might be displaying underlining on the screen or reformatting the document automatically something like that. When the feature to be integrated is bigger than a single class, the increment in incremental integration is bigger than a single class. This diminishes the benefit of incrementalism a little in that it reduces your certainty about the source of new errors, but if you have thoroughly tested the classes that implement the new feature before you integrate them, that s only a small disadvantage. You can use the incremental integration strategies recursively by integrating small pieces to form features and then incrementally integrating features to form a system.

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omit the Attribute suffix to reduce programming typing and to improve the readability of the source code . My code examples in this chapter take advantage of this C# convenience . For example, my source code contains [DllImport(...)] instead of [DllImportAttribute(...)] .

You ll usually want to start with a skeleton you ve chosen for its ability to support the other features. In an interactive system, the first feature might be the interactive menu system. You can hang the rest of the features on the feature that you integrate first. Here s how it looks graphically:

As I mentioned earlier, an attribute is an instance of a class . The class must have a public constructor so that instances of it can be created . So when you apply an attribute to a target, the syntax is similar to that for calling one of the class s instance constructors . In addition, a language might permit some special syntax to allow you to set any public fields or properties associated with the attribute class . Let s look at an example . Recall the application of the DllImport attribute as it was applied to the GetVersionEx method earlier:

Right-click the project in the Solution Explorer, and select Deploy. If you watch the Output Window, you ll see Visual Studio generate a SQL script that is then sent to the target database and run to create the NWSandbox database.

[DllImport("Kernel32", CharSet = CharSet.Auto, SetLastError = true)]

Feature 1 skeleton (menus, perhaps)

The syntax of this line should look pretty strange to you because you could never use syntax like this when calling a constructor . If you examine the DllImportAttribute class in the documentation, you ll see that its constructor requires a single String parameter . In this example, "Kernel32" is being passed for this parameter . A constructor s parameters are called positional parameters and are mandatory; the parameter must be specified when the attribute is applied . What are the other two parameters This special syntax allows you to set any public fields or properties of the DllImportAttribute object after the object is constructed . In this example, when the DllImportAttribute object is constructed and "Kernel32" is passed to the constructor, the object s public instance fields, CharSet and SetLastError, are set to CharSet.Auto and true, respectively . The parameters that set fields or properties are

Figure 29-11 In feature-oriented integration, you integrate classes in groups that make up identifiable features usually, but not always, multiple classes at a time.