Overriding non-virtual methods using IL and Reflection.Emit

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rfuller987@hotmail.com - 07 Jul 2006 18:48 GMT

Is it possible to override non-virtual methods using Reflection.Emit.
I'm creating dynamic proxy classes at runtime and I want to be able to
proxy all public methods on an object, regardless of whether the object
author happened to mark them as virtual or not. Is this possible?

-rfuller987
rfuller987@hotmail.com

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Greg Young - 07 Jul 2006 19:19 GMT

No.(Notice that every dynamic proxy has this limitation).

Cheers,

Greg Young
MVP - C#
http://codebetter.com/blogs/gregyoung

> Is it possible to override non-virtual methods using Reflection.Emit.
> I'm creating dynamic proxy classes at runtime and I want to be able to
[quoted text clipped - 3 lines]
> -rfuller987
> rfuller987@hotmail.com

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rfuller987@hotmail.com - 07 Jul 2006 21:19 GMT

That's a real problem. That makes real aspect oriented programming in
.net impossible.

> No.(Notice that every dynamic proxy has this limitation).
>
[quoted text clipped - 11 lines]
> > -rfuller987
> > rfuller987@hotmail.com

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Greg Young - 07 Jul 2006 21:49 GMT

Well I think you picked the right person to talk to. I have some experience
in the area :)

There are other ways of implementing AOP than the dynamic proxy ...

There are also numerous AOP frameworks with this virtual limitation .. see
CastleProject, nAspect, spring .net

People have also looked at such operations as using the profiling API to
instrument IL just before JIT (this is being frowned on a bit).Personally I
at this point am leaning towards a "link" time IL based weave ...

If you happen to be in the southern US I will be speaking on this subject in
New Orleans the 17th.

Cheers,

Greg Young
MVP - C#
http://codebetter.com/blogs/gregyoung

> That's a real problem. That makes real aspect oriented programming in
> .net impossible.
[quoted text clipped - 14 lines]
>> > -rfuller987
>> > rfuller987@hotmail.com

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rfuller987@hotmail.com - 10 Jul 2006 14:19 GMT

Do you have any more information on this 'link' time IL based weave.
Sounds promising, although I don't think I have the expertise to
implement it myself.

How does .net remoting work? Doesn't it manage to proxy any
MarshalByRef object regardless of the object's functions being marked
as virtual?

-rfuller

> Well I think you picked the right person to talk to. I have some experience
> in the area :)
[quoted text clipped - 35 lines]
> >> > -rfuller987
> >> > rfuller987@hotmail.com

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Overriding non-virtual methods using IL and Reflection.Emit

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