error CS8773: "Feature 'global using directive' is not available in C# 9.0" after downgrade from net6.0 to net5.0

user_4734673 0
Viewed 20183

I have a project that was initially created for .NET 6 but then I needed to downgrade it to .NET 5. I changed Target framework in Project Properties and tried to compile. As a result I received a bunch of the errors:

GlobalUsings.g.cs(2,1,2,29): error CS8773: Feature 'global using directive' is not available in C# 9.0. Please use language version 10.0 or greater.

File GlobalUsings.g.cs is created automatically and it reappears every time after compilation.

.net-6.0 .net-5 .net-core visual-studio c#
4 Answers

Finally I found that the reason is an extra property ImplicitUsings in the project file that is not supported by .net 5.0.

  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

I needed to remove ImplicitUsings from the file.

user_47346730

remove <ImplicitUsings>enable</ImplicitUsings> in the csproj project file, then can build success

find this solution from here

user_193048380

To get rid of this error which is caused by downgrading below net6.0.

Remove the following items from the .csproj file:

  1. <ImplicitUsings>
  2. <Using Include="..." />
user_104224100

Remove the tag indeed work.
But just change the value of it did the trick as well!

<ImplicitUsings>disable</ImplicitUsings>

user_44495480
Related