[Bug]: error MSB4175: The task factory "RoslynCodeTaskFactory" could not be loaded from the assembly "/usr/local/share/dotnet/sdk/8.0.203/Microsoft.Build.Tasks.Core.dll".

[phillippschmedt]

Issue Description

error MSB4175: The task factory "RoslynCodeTaskFactory" could not be loaded from the assembly "/usr/local/share/dotnet/sdk/8.0.203/Microsoft.Build.Tasks.Core.dll". Could not load file or assembly 'System.CodeDom, Version=7.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. Could not find or load a specific file. (0x80131621)

when trying to run a RoslynCodeTaskFactory task in .NET 8 and VS for Mac 17.6.10.

Steps to Reproduce

Run a RoslynCodeTaskFactory task.

Expected Behavior

Task runs fine.

Actual Behavior

Throws error:
error MSB4175: The task factory "RoslynCodeTaskFactory" could not be loaded from the assembly "/usr/local/share/dotnet/sdk/8.0.203/Microsoft.Build.Tasks.Core.dll". Could not load file or assembly 'System.CodeDom, Version=7.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. Could not find or load a specific file. (0x80131621)

Analysis

Was mentioned here:
#9471
and
#9732

Versions & Configurations

dotNET SDK: 8.0.203
VS for Mac: 17.6.10

[rainersigwald]

Per https://learn.microsoft.com/visualstudio/mac/supported-versions-net, Visual Studio for Mac does not support .NET SDK 8.0.

[phillippschmedt]

@rainersigwald Thanks for sharing the page with me, I was not aware of that.

Microsoft being Microsoft once again. ¯ \ (ツ)/¯

In case anyone else runs into this problem, a workaround that seems to work is:

sudo cp /usr/local/share/dotnet/sdk/7.X.X.X/System.CodeDom.dll /usr/local/share/dotnet/sdk/8.X.X.X

Replace the 7.X.X.X with one of your 7.x versions installed and the 8.x.x.x with the one your vs for mac is using. Good luck.

[jrdodds]

The issue presents for net6 and net7. Is it not a net8 issue. It appears to be a regression.

[rainersigwald]

@jrdodds Can you share a log showing this happening using the .NET 6 or 7 SDK?

[jrdodds]

My test was bad. When I corrected my test, net6 and net7 work as expected and net8 fails because it is not supported.