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Asked: 2026-05-19T02:35:33+00:00

I did substantial work developing CLR routines to implement DAL functionality using VS2010 intending

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I did substantial work developing CLR routines to implement DAL functionality using VS2010 intending to port them to SQL2008R2 clr assemblies;
Did the unit testing, everything seemed fine..
Then the day came to put them in to SQL CLR assemblies..
Alas!, SQL2008 only support assemblies that are below framework 3.5 !
Days spent adopting c# 4.0 functionality, now have to be thrown away and slide back to c#2.0. spending yet few more days.

Can I use Framework 4 CLR assemblies with SQL2010 ?

Will there be support for framework 4.0 support in SQL2008R2 ? if so when ?

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  1. Editorial Team

    Will there be support for framework 4.0 support in SQL2008R2 ? if so when ?

    http://software.intel.com/en-us/blogs/2009/10/16/sql-server-2008-sqlclr-net-framework-version/

    SQL Server 2008 and the forthcoming
    SQL Server 2008 R2 release, previously
    codenamed “Kilimanjaro”, will both
    continue to load the latest service
    release of the version 2.0 CLR.

    You might be wondering, what is the
    rationale behind SQL Server continuing
    to load version 2.0 of the CLR? Is it
    merely a healthy cautious attitude so
    existing UDT’s, UDA’s, etc. are not
    broken; or is it because additional
    engineering would be required to
    support the new CLR?

    It seems the answer is actually a
    little of both.

    With the .net framework 4.0 we now
    have the ability to load two or more
    distinct versions of the CLR within a
    single process. In previous releases
    of the .net framework, a process could
    only load a single instance of the
    CLR. Given this restriction the CLR
    team recommended that hosts, such as
    SQL Server, use the LockClrVersion
    function to determine the version of
    the CLR to load prior to
    initialization. So, as stated
    previously, SQL Server 2008 and SQL
    Server 2008 R2 will continue to load
    the latest service release of the
    version 2.0 CLR as the version is
    locked before initialization of the
    CLR begins.

    While future versions of SQL Server
    may load newer versions of the CLR, or
    even support the loading of multiple
    CLR’s within the process, version 2.0
    of the CLR is here to stay for SQLCLR
    within SQL Server 2008 and SQL Server
    2008 R2.

    Also, a little bit more here.

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