Question 209279 in Visual Studio Code Question posted in
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Visual Studio Code – Invalid option for /langversion on C# project build

Visual Studio is giving me this error: "CS1617 C# Invalid option for /langversion. Use to list supported values" and I do not know how to fix it. I have looked around the internet and I cannot find the fix to it. I have tried many things and I do not know how to work on this, as I cannot build and test my .NET code without building it.

I tried some people with the same error on stackoverflow, and none of the solutions that people gave worked for me, if someone could give me a fix that would work that would be very appreciated. I use visual studio 2022 version 17.1.6

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2

Answers


  1. 0

    You should either install the sdk of the framework version the project is using or replace it with an existing version.

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  2. 0

    Microsoft documents the accepted values for langversion in Microsoft Learn.

    I am using the following in my .csproj project file:

    <PropertyGroup>
    <LangVersion>latest</LangVersion>
</PropertyGroup>
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