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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.Attribute. 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
Nov 17 '05 #1
5 1166
>I'm making my own attribute. I've observed that the AttributeUsage attribute
may only be applied to classes which derive from System.Attribute. How do I
make my attribute in a resembling way, so it may only be applied to classes
which implement a certain interface?


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.
Nov 17 '05 #2
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" <ma********************@mvps.org> wrote in message
news:u9**************@TK2MSFTNGP10.phx.gbl...
I'm making my own attribute. I've observed that the AttributeUsage attributemay only be applied to classes which derive from System.Attribute. How do Imake my attribute in a resembling way, so it may only be applied to classeswhich implement a certain interface?


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.

Nov 17 '05 #3
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)?


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.
Nov 17 '05 #4
Thank you again!

I think it would be rather convenient with a read only property of
System.Attribute for giving this.
Best regards,

Henrik Dahl

"Mattias Sjögren" <ma********************@mvps.org> wrote in message
news:ON**************@TK2MSFTNGP14.phx.gbl...
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)?


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.

Nov 17 '05 #5
Henrik,
I think it would be rather convenient with a read only property of
System.Attribute for giving this.


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.
Nov 17 '05 #6

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