C# AttributeUsage for Specific Class

Question

Is it possible to have something like AttributeUsage to restrict the use of an attribute to a specific class (not just AttributeTargets.Class - that would be any class)?

Answer 1

No. There is nothing in the framework that would do this.

However, the code that uses the attribute in question could always check to make sure that the class's type is the specific class (or one of its subclasses).

Attributes, by themselves, do nothing - so this should have the same effect.

Answer 2

Make all data in the Attribute accessible only by a public static method which takes the class you want in question and checks to see if it has the given attribute.

Answer 3

One way to accomplish this, if you have access to the specific class, is detailed by Marc Gravel here: http://marcgravell.blogspot.com/2009/06/restricting-attribute-usage.html. Basically you implement the attribute as a protected class of the specific type. Then it can only be used by that type.