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  1. June 18th, 2010, 03:03 AM #1
    skuanet
    skuanet is offline Member
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    interoperability .net 2.0 & .net 4.0

    Hi all,
    is it possible to call some methods of a class library developed with .net framework 4.0 in an application developed by using .net framework 2.0?

    Many thanks,
    Francesco
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  2. June 18th, 2010, 08:31 AM #2
    TechGnome
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    Re: interoperability .net 2.0 & .net 4.0

    As long as 4.0FW was installed... I don't see why not... Good question... never occurred to me. I've gone the other way, where a 3.5 object called into 2.0, and that worked, I guess I kind of assumed that it would work going upwards too... I'll have to try that later.

    -tg
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  3. June 18th, 2010, 08:35 AM #3
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    matthewsanford@gmail.com is offline Member
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    Re: interoperability .net 2.0 & .net 4.0

    no it is not possible your manifest defines the version of the dlls that are required to run your application. If those dlls are not present the application will not run.
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  4. June 18th, 2010, 10:07 AM #4
    TechGnome
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    Re: interoperability .net 2.0 & .net 4.0

    True... if FW4.0 isn't installed on the system, there shouldn't be an expectation that it would run.... BUT... if FW4.0 IS installed...

    -tg
    * I don't respond to private requests for help. It's not conducive to the general learning of others.-I also subscribe to all threads I participate, so there's no need to pm when there's an update.*
    * How to get EFFECTIVE help: The Hitchhiker's Guide to Getting Help - how to remove eels from your hovercraft *
    * How to Use Parameters * Create Disconnected ADO Recordset Clones * Set your VB6 ActiveX Compatibility * Get rid of those pesky VB Line Numbers * I swear I saved my data, where'd it run off to???
    * On Error Resume Next is error ignoring, not error handling(tm). * Use Offensive Programming, not Defensive Programming.
    "There is a major problem with your code, and VB wants to tell you what it is.. but you have decided to put your fingers in your ears and shout 'I'm not listening!'" - si_the_geek on using OERN
    MVP '06-'10
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  6. June 18th, 2010, 10:17 AM #5
    skuanet
    skuanet is offline Member
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    Re: interoperability .net 2.0 & .net 4.0

    Yes of course, I have installed both .net 2.0 and .net 4.0.
    My question is about the use of a .net 4.0 class library.
    If I add a reference to that class library in a .net 2.0 application an error occurs.
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  7. June 18th, 2010, 10:50 AM #6
    TechGnome
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    Re: interoperability .net 2.0 & .net 4.0

    Well, then that should be your answer right there. It would seem that the answer is "no, you can't."

    Just out of curiosity, what is the error you get?

    -tg
    * I don't respond to private requests for help. It's not conducive to the general learning of others.-I also subscribe to all threads I participate, so there's no need to pm when there's an update.*
    * How to get EFFECTIVE help: The Hitchhiker's Guide to Getting Help - how to remove eels from your hovercraft *
    * How to Use Parameters * Create Disconnected ADO Recordset Clones * Set your VB6 ActiveX Compatibility * Get rid of those pesky VB Line Numbers * I swear I saved my data, where'd it run off to???
    * On Error Resume Next is error ignoring, not error handling(tm). * Use Offensive Programming, not Defensive Programming.
    "There is a major problem with your code, and VB wants to tell you what it is.. but you have decided to put your fingers in your ears and shout 'I'm not listening!'" - si_the_geek on using OERN
    MVP '06-'10
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  8. June 20th, 2010, 04:16 AM #7
    dannystommen
    dannystommen is offline Member +
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    Re: interoperability .net 2.0 & .net 4.0

    If I'm correct (not 100% sure), you can't run .NET 2.0 DLLs in your .NET 4 application because they use a different CLR. .NET 2.0 uses the CLR 2.0 and .NET 4 uses the CLR 4.

    You can use .NET 3.5 in a .NET 2.0 app because .NET 3.5 also uses the CLR 2.0.
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