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// This time, we are using the AttributeUsage attribute

// to annotate our custom attribute.

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct,

AllowMultiple = false, Inherited = false)]

public sealed class VehicleDescriptionAttribute : System.Attribute

{

...

}

With this, if a developer attempted to apply the [VehicleDescription] attribute on anything

other than a class or structure, he or she is issued a compile-time error.

■

Tip

Always get in the habit of explicitly marking the usage flags for any custom attribute you may create, as not

all .NET programming languages honor the use of unqualified attributes!

Assembly-Level (and Module-Level) Attributes

It is also possible to apply attributes on all types within a given module (for a multifile assembly) or

all modules within a given assembly using the [module:] and [assembly:] tags, respectively. For

example, assume you wish to ensure that every public type defined within your assembly is CLS

compliant. To do so, simply add the following line in any one of your C# source code files (do note

that assembly-level attributes must be outside the scope of a namespace definition):