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To use the new C# 7.1 language features with Visual Studio 2017, you add the setting <LangVersion>latest</LangVersion> to your project file(s).
However, building such projects from MSBuild (version 15.3.409.57025, located at C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\Bin) results in an error:
CSC : error CS1617: Invalid option 'latest' for /langversion;
must be ISO-1, ISO-2, Default or an integer in range 1 to 6.
Is this feature just not yet supported by MSBuild, or is it possible to get this working?
This covers 200+ projects that were originally created variously in Visual Studio 2013 and 2015. They were all re-targeted to .NET 4.7 using the Target Framework Migrator tool (which saved lots of clicking and appears - based on inspecting .csproj file changes - to do the job correctly).
The projects all build successfully from Visual Studio 2017.
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The using statement causes the object itself to go out of scope as soon as Dispose is called. Within the using block, the object is read-only and can't be modified or reassigned. A variable declared with a using declaration is read-only.
Get started with C. Official C documentation - Might be hard to follow and understand for beginners. Visit official C Programming documentation. Write a lot of C programming code - The only way you can learn programming is by writing a lot of code.
Begin with solving basic level logical questions, and while solving always follow the best approach and best practices. Show activity on this post. A really good way to exercise C is to read (or reread) The C Programming Language (K&R) and to do every exercise at the end of each chapter.
Microsoft.Net.Compilers nuget package does not work and needn't to be installed.project/build settings
Set at least C# 7.1 or higher in the Debug and Release build properties. (via: Project menu > [ProjectName] Properties > Build tab > [Advanced] button > Language Version).
Setting it to latest does not work.
Also make sure that you are running the latest MSBuild version.
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Add a reference to the Microsoft.Net.Compilers package (version 2.3.x, to get C# 7.1).
A short description of the package:
Microsoft.Net.Compilers
This package not only includes the C# and Visual Basic compilers, it also modifies MSBuild targets so that the included compiler versions are used rather than any system-installed versions. Once installed, this package requires Microsoft Build Tools 2015.
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