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CSC : error CS1617: Invalid option '9' for /langversion. Use '/langversion:?' to list supported values. #761

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plantematthieu opened this issue Jun 17, 2021 · 2 comments
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CSC : error CS1617: Invalid option '9' for /langversion. Use '/langversion:?' to list supported values. #761

plantematthieu opened this issue Jun 17, 2021 · 2 comments

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@plantematthieu
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Hi,

I'm trying to build the DeepLMTProvider but I got this issue.
I'm using Visual Studio 2017 and my target framework is .NET Framework 4.8.

Thanks for your help.

Matthieu
@RainerLeukel
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Hi,

you have to use Visual Studio 2019 for using C#9 syntax.

See also: dotnet/roslyn#21783 (comment)

Or you re-code the incompatible parts so that they are compatible with your Visual Studio 2017 C#7 version.

Regards
Rainer

@plantematthieu
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Thanks RainerLeukel, it worked!
I also had to change the langversion manually in the .csproj file

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@RainerLeukel @plantematthieu