'Using C# 6 with WCF

I would like to use interpolated strings in this old WCF project, and I have tried to change the target framework to .NET Framework 4.8 (from project pages). But this does not seem to change the C# version from 5 to 6.

I'm still getting the error

Feature 'interpolated strings' is not available in C# 5. Please use language version 6 or greater.

Is this even possible?

c++sharpwcfc#-6.0


Solution 1:[1]

You have to update language version in your .csproj file,

<PropertyGroup>
   <LangVersion>6</LangVersion>
</PropertyGroup>

When you use language version as a 6, compiler accepts only syntax that is included in C# 6.0 or lower.

If you want to use any features which are included in higher or the latest version of C# like pattern matching, switch expression, global using then you can use <LangVersion>latest</LangVersion> instead of <LangVersion>6</LangVersion>.

More details, kindly check C# language version reference

Demo to update .csproj file:

enter image description here

Solution 2:[2]

edit the csproj: <LangVersion>6</LangVersion> (or higher); done

Solution 3:[3]

You can also and a LangVersion environment variable.

You can use https://aks.as/msbuildlog to debug your build.

Solution 4:[4]

Maybe you can also try to download the nuget package. Microsoft.CodeDom.Providers.DotNetCompilerPlatform.

Replacement CodeDOM providers that use the new .NET Compiler Platform ("Roslyn") compiler as a service APIs. This provides support for new language features in systems using CodeDOM (e.g. ASP.NET runtime compilation) as well as improving the compilation performance of these systems.

Sources

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Source: Stack Overflow

Solution Source
Solution 1
Solution 2 Marc Gravell
Solution 3 Paulo Morgado
Solution 4 Lan Huang

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