How to enable C# 9.0-preview

Question

I have downloaded and installed v5.0.0-preview.5. My project is targeting net5.0 but C# 9.0 is not working. How can I enable C#

Answer 1

As per October 2020,

1. you can explicitly use the 9.0 language version in .csproj
2. Using target framework as .net 5 implicitly uses C# 9 by default .

The .csproj should be as such:

  
    Exe
    net5.0
  

You can add 9.0 if you wish, but it should be optional.

OutputType can be adapted, of course, and you'll need the .NET 5 SDK.

See for instance this blog for more information.