Can CLR 1.1 and CLR 2.0 run in the same app?

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Brian R. - 07 Mar 2006 01:19 GMT

Is it possible to run two versions of the CLR in the same application? The
framework of our application was developed in 2003 under CLR 1.1 and some of
our plugins were developed in VS 2005 and need the 2.0. The 2003 components
experience problems when running with the 2.0 CLR only.

I have tried assembly binding attributes multiple ways in the
application.config file to no avail. Any help?

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Brian R.

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"Jeffrey Tan[MSFT]" - 07 Mar 2006 08:44 GMT

Hi Brian,

Thanks for your post!

No, although multiple versions of the CLR may exist on a given machine,
only one version may run in a particular process. So once the host chooses
which version to load, all managed code that runs in that process will use
that version of the CLR. For more information, please refer to the MSDN
article below:
"Microsoft .NET: Implement a Custom Common Language Runtime Host for Your
Managed App"
http://msdn.microsoft.com/msdnmag/issues/01/03/clr/

Regarding your issue, I think we can choose .Net2.0. Because .Net2.0 has
backward compatibility, .Net1.1 application should work well in .Net2.0
CLR. Please refer to the link below:
"Testing compatibility for Whidbey/Everett"
http://blogs.msdn.com/danielfe/archive/2003/12/03/51921.aspx

However, we still should take care of the breaking changes in .Net2.0:
"Breaking Changes in .NET Framework 2.0"
http://msdn.microsoft.com/netframework/programming/breakingchanges/default.a
spx

Hope this helps!

Best regards,
Jeffrey Tan
Microsoft Online Partner Support

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Can CLR 1.1 and CLR 2.0 run in the same app?

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