FileNotFoundException for a .NET Framework library reference

Question

Getting a FileNotFoundException for a reference to a .NET Framework 4.6.2 library out of a .NET Framework 4.6.2 library that was loaded by a .NET 5 project.

Tried all known solutions:

Interestingly, the Fusion Log does not list any access attempt to the problematic dll file.

Compiled the project via Rebuild, nothing helped.

Did you check if it is in the output folder for .net5, or if it is in the target framework folder for net462? — Mafii, Dec 20 '22 at 11:23
How are you referencing the library? I think more details are needed. The posts linked are about unmanaged DLLs I think, but this is .NET referencing which is a different mechanism. — John Alexiou, Dec 20 '22 at 14:21
yes, it was linked as managed dll and the dll was copied to the output folder — Nicolas, Dec 21 '22 at 16:00

score 0 · Accepted Answer · answered Dec 20 '22 at 10:09

0

After having created a completely new library and placed only the isolated method there that needs to be accessed and the error reoccurred also, it was clear, that this isn't a setup problem.

Solved this problem with the Clean Solution command!

This command is available:

in the context menu of the solution entry in the Solution Explorer
in the Build menu of visual studio

answered Dec 20 '22 at 10:09

Nicolas

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You could mark it as the answer. – Jiale Xue - MSFT Dec 27 '22 at 11:16

FileNotFoundException for a .NET Framework library reference

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