.Net assemblies in different versions

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Hi,
I have developed a class library in .net framework 4.0 in which i am referring System.Net.Http namespace. Now i have to refer this dll into my existing application(running v3.5) and done it. While executing the application shows the following error

"This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded."

Please comment.

Posted 20-May-14 20:04pm

normalsoft

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Mehdi Gholam · Answer 1 · 2014-05-20T20:10:00

Solution 1

You cannot use a later version of .net assemblies with an older version (i.e. v4 in a v3.5 application) this is because of the possible use of newer runtime features which don't exist in the older runtime.

You can however do the opposite (i.e. use a v2 dll in a v2+ application).

If you are not using newer features then compile your DLL to v3.5 and use that.

Posted 20-May-14 20:10pm

Mehdi Gholam

Comments

Sergey Alexandrovich Kryukov 21-May-14 11:13am

This is not a comment, but an answer which I recommend to accept formally. "Is built by runtime" simply means that each .NET Framework version comes with the compiler and everything else (MSBuild, libraries used by the compiler); all compiled with this .NET version. It's quite obvious why you cannot access newer libraries installed with newer .NET version. If it was possible, it was a real disaster.
—SA

Sergey Alexandrovich Kryukov 21-May-14 11:13am

Please see my comment above. My 5.
—SA