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

[AshokG]

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

 

[Marc Gravell]

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

 

[Ignacio Machin ( .NET/ C# MVP )]

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

 

[Chazz]

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:

 

[AshokG]

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