Swashbuckle.AspNetCore.Cli only targets .NET Core 2.1

Package: Swashbuckle.AspNetCore.Cli Version: 5.0.0-rc3 Project Target Framework: netcoreapp3.0

Reproduction Steps:

1. Create .NET Core 3.0 API project
2. Configure Swashbuckle.AspNetCore-5.0.0-rc3
3. Run dotnet tool run swagger tofile --output output/swagger.json bin/Release/netcoreapp3.0/MyWebApi.dll v1

Description: I have a .NET Core 3.0 project that includes Swashbuckle.AspNetCore-5.0.0-rc3 that I am trying to use the CLI to build a swagger file for during the build process. I have tool included in my dotnet tools manifest and when I restore, it installs correctly. However when I run the command, I get the following. Since Swashbuckle.AspNetCore-5.0.0-rc3 supports netcoreapp3.0, I suspect the CLI should as well.

Tool 'swashbuckle.aspnetcore.cli' (version '5.0.0-rc3') was restored. Available commands: swagger

Restore was successful.
It was not possible to find any compatible framework version
The specified framework 'Microsoft.NETCore.App', version '2.1.0' was not found.
  - The following frameworks were found:
      3.0.0-rc1-19456-20 at [/opt/hostedtoolcache/dotnet/shared/Microsoft.NETCore.App]

You can resolve the problem by installing the specified framework and/or SDK.

[ericl85]

Just discovered you can use the environment variable:

DOTNET_ROLL_FORWARD_ON_NO_CANDIDATE_FX=2 to work around this.

https://github.com/dotnet/core-setup/blob/master/Documentation/design-docs/multilevel-sharedfx-lookup.md

Looks like they there is a RollForward property for the csproj file. I tried adding it to my own project file, but it did not work, so I’m thinking it needs to go on the Swashbuckle CLI project file.

[aelij]

Have you tried this on a machine that doesn’t have .NET Core 2.x installed?