Can't Build Project In Visual Studio 2022 Due To XmlSerialization (sgen.exe) And Can't Disable

Question

I'm getting this error when I compile my project written in VS 2019 in dotnet which I've just migrated to dotnet core 6.0 and loaded into VS 2022.

Error   MSB6003 The specified task executable "sgen.exe" could not be run. System.ComponentModel.Win32Exception (0x80004005): The filename or extension is too long

There appears to be a known issue with XmlSerialization failing due to long filenames. Fixes include turning off Generate Serialization assembly and the official MS fix of enabling long filenames since at least 2017.

Disabling XmlSerialization should be possible from the UI in VS 2019, and should be possible in the project file by adding:

<GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>

However, there is no option in VS 2022 to do this through the UI, and the config above seems to be ignored. As such I can't see how to avoid the error in VS 2022. I've tried disabling it in the VS 2019 and loading in VS 2022, but that doesn't work.

Update: I also tried moving the solution to a dir on root with a 2 char name. No joy.

Any ideas?

Answer 1

I just tried disabling in the project file again, and it worked this time.

<PropertyGroup>
   ...
   <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
</PropertyGroup>

VS 2022 doesn't seem to have the UI option like VS 2019 so you seem to have to do this manually.

I'm getting now a

The command "copy "\policy.xml" "" " exited with code 1 error

but that's a different problem...