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

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  • AshokG
    #1

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

    Hi,

    In .NET there is attribute named ObsoleteAttribu te which is derived from
    System.Attribut e 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.Attribut e 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


    Tags: None
    • Marc Gravell
      #2
      Re: How to write a .NET attribute which does just likeObsoleteAtt ribute...

      You can't... ObsoleteAttribu te 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

        Comment

        • Ignacio Machin ( .NET/ C# MVP )
          #3
          Re: How to write a .NET attribute which does just likeObsoleteAtt ribute...

          On Apr 24, 8:26 am, "AshokG" <gw2ks...@hotma il.comwrote:
          Hi,
          >
          In .NET there is attribute named ObsoleteAttribu te which is derived from
          System.Attribut e 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.Attribut e 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 :)

            Comment

            • Chazz
              #4
              Re: How to write a .NET attribute which does just like ObsoleteAttribu te...

              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 ObsoleteAttribu te which is derived from
              System.Attribut e 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.Attribut e 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
              >
              >

                Comment

                • AshokG
                  #5
                  Re: How to write a .NET attribute which does just like ObsoleteAttribu te...

                  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" <gw2ksoft@hotma il.comwrote in message
                  news:uTeKFZgpIH A.1236@TK2MSFTN GP02.phx.gbl...
                  Hi,
                  >
                  In .NET there is attribute named ObsoleteAttribu te which is derived from
                  System.Attribut e 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.Attribut e 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
                  >

                    Comment

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