Internal working CLR when referencing a 1.1 lib from a 2.0 (or higher) asp.net application?

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Martijn B - 31 Jan 2008 11:34 GMT

Hi there,

I have a question about the internal working of the CLR when it comes
to a 2.0 (or higher) asp.net app referencing a library written in 1.1.

How does the CLR handles this? Does is start CLR 2.X.X and CLR 1.1.X.X
(if so what kind of performance problemes gives this, is there any
info written about this subject) or does CLR 2.X.X also handle the 1.1
library? I don't have any clue so it would be nice if anyone could
enlightening me.

Thanks in advance!

Martijn B

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Marc Gravell - 31 Jan 2008 12:10 GMT

You only get one CLR per process. The 1.1 code runs in the 2.0 CLR,
which supports all of the IL instructions from 1.1 so there are no
fundamental "it can't work" issues. However, it does mean that the 1.1
code will run with the 2.0 versions of the libraries - i.e. if there
are some obscure changes in ArrayList (or some other type being used
by the 1.1 assembly), then there may be subtle behavior differences.

Marc

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Phill W. - 31 Jan 2008 13:04 GMT

> I have a question about the internal working of the CLR when it comes
> to a 2.0 (or higher) asp.net app referencing a library written in 1.1.
[quoted text clipped - 3 lines]
> info written about this subject) or does CLR 2.X.X also handle the 1.1
> library?

The 2.0 Runtime can load and run code from 1.1 assemblies and, for the
most part, they /will/ "just work". Those 1.1 classes, of course,m will
in turn call Framework methods that will now be taken from the 2.0
runtime, but there are /very/ few cases where this should cause you any
grief.

The big "Gotcha!", for anyone with a code base big enough that you can't
recompile everything overnight, is that a 1.1 Process *cannot* load
assemblies built against Fx 2.0 or later.

HTH,
Phill W.

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Martijn B - 01 Feb 2008 09:05 GMT

On 31 jan, 14:04, "Phill W." <p-.-a-.-w-a-r...@-o-p-e-n-.-a-c-.-u-k>
wrote:

> > I have a question about the internal working of the CLR when it comes
> > to a 2.0 (or higher) asp.net app referencing a library written in 1.1.
[quoted text clipped - 16 lines]
> HTH,
> Phill W.

Thanks All

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Internal working CLR when referencing a 1.1 lib from a 2.0 (or higher) asp.net application?

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