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Question by fbrulhart · Mar 11, 2019 at 02:11 PM · compiler-error

Unity 2018.3 + Visual Studio 2015 -> Invalid "latest" for /langversion

Hi everyone!

I am trying to upgrade our version of Unity for our project and the last error I get is about the language version of the csproj.
I know I can override by hand the version to something that visual studio does understand but is there a way to avoid all our company to do that several time per day?
Did I miss a configuration somewhere?


For the record, here is the error:

 Error    CS1617:    Invalid option 'latest' for /langversion; must be ISO-1, ISO-2, Default or an integer in range 1 to 6.        


Thanks for the help!

Florian.

P.S. I have looked at :
https://answers.unity.com/questions/1393715/error-invalid-option-6-for-langversion-must-be-iso.html
https://forum.unity.com/threads/langversion-latest-langversion-is-not-recognized-by-visual-studio.579697/
But I don't understand how they got around the error...

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Answer by Tortuap · May 04, 2019 at 10:05 AM

I found a workaround, but credits goes to https://stackoverflow.com/questions/45578298/how-to-enable-c-sharp-7-features-on-unity3d-projects )


Copy & paste this into a file as Assets/Editor/FixProjectVersion.cs :

 #if ENABLE_VSTU
 
 using SyntaxTree.VisualStudio.Unity.Bridge;
 using UnityEditor;
 
 // Adapted from https://stackoverflow.com/questions/45578298/how-to-enable-c-sharp-7-features-on-unity3d-projects
 [InitializeOnLoad]
 public class ProjectFilesGeneration
 {
     static ProjectFilesGeneration ()
     {
         ProjectFilesGenerator.ProjectFileGeneration += ( string name, string content ) =>
         {
             return content.Replace
             (    "<LangVersion>latest</LangVersion>",
                 "<LangVersion>6</LangVersion>" );
         };
     }
 }
 
 #endif
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