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I have a UsingTask in my project, .Net 6. I have a small script to set the AssemblyVersion, using CodeTaskFactory. See code below. However, I cannot use or execute CodeTaskFactory on the build server using MS Build.

It gives these errors:

Error MSB4801: The task factory "CodeTaskFactory" is not supported on the .NET Core version of MSBuild Error MSB4175: The task factory "CodeTaskFactory" could not be loaded from the assembly "C:\Program Files\dotnet\sdk\6.0.101\Microsoft.Build.Tasks.Core.dll". The task factory must return a value for the "TaskType" property

I looked at some other options, which all failed as they lacked one or another thing. So finally I ask here, what are my options to run a UsingTask with an output on the MS Build server?

My code

 <UsingTask TaskName="mytask" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll"> <ParameterGroup> <AssemblyVersion ParameterType="System.String" Output="true" /> </ParameterGroup> <Task> <Code Type="Fragment" Language="cs"> <![CDATA[ Log.LogMessage(MessageImportance.High, "we are here"); AssemblyVersion = "1.2.3.4"; ]]> </Code> </Task> </UsingTask>
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1 Answer 1

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The error message is correct. Your UsingTask is trying to use .Net Framework which is not available. Update the UsingTask to use the RoslynCodeTaskFactory in place of the CodeTaskFactory.

e.g.:

<UsingTask TaskName="mytask" TaskFactory="RoslynCodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.Core.dll" >

See MSBuild inline tasks which states (with emphasis added by me):

In MSBuild 15.8, the RoslynCodeTaskFactory was added which can create .NET Standard cross-platform inline tasks. If you need to use inline tasks on .NET Core, you must use the RoslynCodeTaskFactory.

See also MSBuild inline tasks with RoslynCodeTaskFactory.

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1 Comment

@johnathan I AM using RoslynCodeTaskFactory, yet I continue to get the same error. I posted as a separate question here: stackoverflow.com/questions/79258567/…

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