Make each csproj in a solution target a different C# version

Question

I have a solution that contains five C# console application projects. I would like each project to target a different version of C#.

MyLearningSolution.sln
    CSharp01.csproj
    CSharp02.csproj
    CSharp03.csproj
    CSharp04.csproj
    CSharp05.csproj

Is there a way to do this either via Visual Studio or via editing each csproj file?

I have tried the following searches:

csproj target specific C# version, this talks about targeting a specific framework version
csproj choose c# version, doesn't answer the question

Marc Gravell · Accepted Answer · 2015-03-04 16:39:12Z

11

This can be done by looking at the <LangVersion> element of the csproj file. Possible values:

<LangVersion>default</LangVersion>
<LangVersion>ISO-1</LangVersion>
<LangVersion>ISO-2</LangVersion>
<LangVersion>3</LangVersion>
<LangVersion>4</LangVersion>
<LangVersion>5</LangVersion>

To do it via the UI, go to Project Properties => Build => Advanced... => Language Version

answered Mar 4, 2015 at 16:39

Marc Gravell

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1 Comment

Mike Zboray Over a year ago

I think its worth pointing out LangVersion and actually using an older compiler version are subtly different. Eric Lippert explains it here.

Habib · Accepted Answer · 2015-03-04 16:39:11Z

7

Right click on Project, go to Properites, There under Build click the Advanced.. button, there you can specify Language version.

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answered Mar 4, 2015 at 16:39

Habib

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