C# version error when building with msbuild, ok with Visual Studio
Question
I can build my project just fine using Visual Studio 2017; however when I use msbuild 15, I get this eror:
error CS8306: Tuple element name 'value' is inferred. Please use language version 7.1 or greater to access an element by its inferred name.
The language version is set to 7.3 in my project file; why would I get this error when running msbuild?
2 answers
solution1
3 ACCPTED 2018-08-25 16:37:34
I figured it out - thanks to Olivier Jacot-Descombes who suggested I look in the project properties!
What I needed to do was set my C# version for all platforms (eg any CPU, x68, x64) to 7.3 in addition to setting it for all configurations (debug/release) as he'd suggested.
solution2
1 2018-08-25 15:05:45
MSbuild 15 does not support .NET Framework 4.7.2 .
Per the GitHub issue, this was merged in May: github.com/Microsoft/msbuild/issues/3285
Version 15.7.180 should work: https://github.com/Microsoft/msbuild/releases/tag/v15.7.180.61344
Edit: Version 15.8.166.59604 shipped with Visual Studio 15.8, which was released in April. Though, support for .NET Framework 4.7.2, was implemented in May.
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