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How to write a .NET attribute which does just like ObsoleteAttribute...

Hi,

In .NET there is attribute named ObsoleteAttribute which is derived from
System.Attribute Class. This attribute when applied to a target (class or
method etc.) gives a compiler warning/error. I know we can write our own
attributes by inheriting the System.Attribute but I want to make it give
compiler warning or error when it is applied on the defined attribute
target.

How can we write such an attributes?

Regards,
Ashok G
Jun 27 '08 #1
4 1852
You can't... ObsoleteAttribute is handled as a special-case by the
compiler, not by anything extensible.

What do you want to check, in particular? There may be other ways of
doing it...

Marc
Jun 27 '08 #2
On Apr 24, 8:26*am, "AshokG" <gw2ks...@hotmail.comwrote:
Hi,

In .NET there is attribute named ObsoleteAttribute which is derived from
System.Attribute Class. This attribute when applied to a target (class or
method etc.) gives a compiler warning/error. I know we can write our own
attributes by inheriting the System.Attribute but I want to *make it give
compiler warning or error when it is applied on the defined attribute
target.

How can we write such an attributes?

Regards,
Ashok G
Hi,

AFAIK there is no way of doing that. The compiler knows a given number
of attributes and have CODED actions for them.
You would need to write a new compiler :)
Jun 27 '08 #3
Hi Ashok,

I know you can designate code as 'deprecated'.
Simply deprecate the attribute and each usage of it
will probally result in a compiler warning.

(not sure 100% because i have not tried this yet)

Let me know if it works!

Chazz
AshokG schreef:
Hi,

In .NET there is attribute named ObsoleteAttribute which is derived from
System.Attribute Class. This attribute when applied to a target (class or
method etc.) gives a compiler warning/error. I know we can write our own
attributes by inheriting the System.Attribute but I want to make it give
compiler warning or error when it is applied on the defined attribute
target.

How can we write such an attributes?

Regards,
Ashok G

Jun 27 '08 #4
I think I can do something with AST (Abstract Syntax Tree) of the .NET
framework. I don't have complete onfo on .NET's AST.

Regards,
Ashok G

"AshokG" <gw******@hotmail.comwrote in message
news:uT**************@TK2MSFTNGP02.phx.gbl...
Hi,

In .NET there is attribute named ObsoleteAttribute which is derived from
System.Attribute Class. This attribute when applied to a target (class or
method etc.) gives a compiler warning/error. I know we can write our own
attributes by inheriting the System.Attribute but I want to make it give
compiler warning or error when it is applied on the defined attribute
target.

How can we write such an attributes?

Regards,
Ashok G

Jun 27 '08 #5

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