AttributeUsage question

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  • Henrik Dahl
    #1

    AttributeUsage question

    Hello!

    I'm making my own attribute. I've observed that the AttributeUsage attribute
    may only be applied to classes which derive from System.Attribut e. How do I
    make my attribute in a resembling way, so it may only be applied to classes
    which implement a certain interface?


    Best regards,

    Henrik Dahl


    Tags: None
    • Mattias Sjögren
      #2
      Re: AttributeUsage question

      >I'm making my own attribute. I've observed that the AttributeUsage attribute[color=blue]
      >may only be applied to classes which derive from System.Attribut e. How do I
      >make my attribute in a resembling way, so it may only be applied to classes
      >which implement a certain interface?[/color]

      You can't. AttributeUsage gets special treatment from the compiler.



      Mattias

      --
      Mattias Sjögren [MVP] mattias @ mvps.org
      http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
      Please reply only to the newsgroup.

        Comment

        • Henrik Dahl
          #3
          Re: AttributeUsage question

          OK.

          Do you know if it's possible, for a specific instance of an attribute, to
          figure out what it's actually attributing (execpt e.g. reflection driven
          traversal in some exhaustive way of course)?


          Best regards,

          Henrik Dahl

          "Mattias Sjögren" <mattias.dont.w ant.spam@mvps.o rg> wrote in message
          news:u9Z4NCLUFH A.1040@TK2MSFTN GP10.phx.gbl...[color=blue][color=green]
          > >I'm making my own attribute. I've observed that the AttributeUsage[/color][/color]
          attribute[color=blue][color=green]
          > >may only be applied to classes which derive from System.Attribut e. How do[/color][/color]
          I[color=blue][color=green]
          > >make my attribute in a resembling way, so it may only be applied to[/color][/color]
          classes[color=blue][color=green]
          > >which implement a certain interface?[/color]
          >
          > You can't. AttributeUsage gets special treatment from the compiler.
          >
          >
          >
          > Mattias
          >
          > --
          > Mattias Sjögren [MVP] mattias @ mvps.org
          > http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
          > Please reply only to the newsgroup.[/color]


            Comment

            • Mattias Sjögren
              #4
              Re: AttributeUsage question

              [color=blue]
              >Do you know if it's possible, for a specific instance of an attribute, to
              >figure out what it's actually attributing (execpt e.g. reflection driven
              >traversal in some exhaustive way of course)?[/color]

              No it isn't, unless you pass it that information.



              Mattias

              --
              Mattias Sjögren [MVP] mattias @ mvps.org
              http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
              Please reply only to the newsgroup.

                Comment

                • Henrik Dahl
                  #5
                  Re: AttributeUsage question

                  Thank you again!

                  I think it would be rather convenient with a read only property of
                  System.Attribut e for giving this.


                  Best regards,

                  Henrik Dahl

                  "Mattias Sjögren" <mattias.dont.w ant.spam@mvps.o rg> wrote in message
                  news:ON2z2SLUFH A.2892@TK2MSFTN GP14.phx.gbl...[color=blue]
                  >[color=green]
                  > >Do you know if it's possible, for a specific instance of an attribute, to
                  > >figure out what it's actually attributing (execpt e.g. reflection driven
                  > >traversal in some exhaustive way of course)?[/color]
                  >
                  > No it isn't, unless you pass it that information.
                  >
                  >
                  >
                  > Mattias
                  >
                  > --
                  > Mattias Sjögren [MVP] mattias @ mvps.org
                  > http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
                  > Please reply only to the newsgroup.[/color]


                    Comment

                    • Mattias Sjögren
                      #6
                      Re: AttributeUsage question

                      Henrik,
                      [color=blue]
                      >I think it would be rather convenient with a read only property of
                      >System.Attribu te for giving this.[/color]

                      Yeah, you're not the first person to ask for it. If it hasn't been
                      done already, why don't you post a suggestion over at the Product
                      Feedback Center http://lab.msdn.microsoft.com/productfeedback/



                      Mattias

                      --
                      Mattias Sjögren [MVP] mattias @ mvps.org
                      http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
                      Please reply only to the newsgroup.

                        Comment

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