ildasm/ilasm to system.data.dll in framework 2.0 result in error

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gilad - 13 Jul 2007 10:11 GMT

Using ildasm.exe I got il file. then, using ilasm I wanted to get the
assembly back but it failed. at the beginning it showed the following
error for several global methods with pinvokeimpl.

error -- Local (embedded native) PInvoke method, the resulting PE file
is unusable

Is this a known bug?
Anything to bypass it?

Thanks,
Gilad.

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Damien - 13 Jul 2007 11:59 GMT

> Using ildasm.exe I got il file. then, using ilasm I wanted to get the
> assembly back but it failed. at the beginning it showed the following
[quoted text clipped - 8 lines]
> Thanks,
> Gilad.

The problem is, System.Data.dll isn't a pure IL assembly - it contains
some native code. As noted in the docs for ildasm (at least the 1.1
version, probably the same in later versions):

Currently, you cannot use this technique with PE files that contain
embedded native code (for example, PE files produced by Visual C+
+ .NET).

(I just pulled up MSDN for 2.0 and it says the same)

So, your IL file doesn't contain enough info to recreate the file.

Damien

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gilad - 15 Jul 2007 07:00 GMT

Hi,
Thanks for the information. Can you please send the link to the MSDN
article?

Gilad.

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Damien - 16 Jul 2007 07:29 GMT

> Hi,
> Thanks for the information. Can you please send the link to the MSDN
> article?
>
> Gilad.

Look down in the Remarks section

http://msdn2.microsoft.com/en-us/library/f7dy01k1(VS.80).aspx

But it really doesn't explain much more.

Damien

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ildasm/ilasm to system.data.dll in framework 2.0 result in error

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