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public ObsoleteAttribute(string message);

public ObsoleteAttribute();

}

Understand that when you supply constructor parameters to an attribute, the attribute is not

allocated into memory until the parameters are reflected upon by another type or an external tool.

The string data defined at the attribute level is simply stored within the assembly as a blurb of

metadata.

The Obsolete Attribute in Action

Now that HorseAndBuggy has been marked as obsolete, if you were to allocate an instance of this

type:

static void Main(string[] args)

{

HorseAndBuggy mule = new HorseAndBuggy();

}

you would find that the supplied string data is extracted and displayed within the Error List window

of Visual Studio 2008 (see Figure 16-7).

C H A P T E R   1 6  

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T Y P E   R E F L E C T I O N, L AT E   B I N D I N G, A N D  AT T R I B U T E - B A S E D   P R O G R A M M I N G

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Figure 16-7.

Attributes in action

In this case, the “other piece of software” that is reflecting on the [Obsolete] attribute is the C#

compiler.