How to handle CS9057 error after adding Microsoft.Extensions.Http.Resilience as a dependency

[g0loob]

I have a .NET 6 project and I wanted to add Microsoft.Extensions.Http.Resilience as a dependency. After adding, I have following errors:

CSC : error CS9057: The analyzer assembly '/root/.nuget/packages/microsoft.extensions.telemetry.abstractions/8.3.0/analyzers/dotnet/cs/Microsoft.Gen.Logging.dll' references version '4.4.0.0' of the compiler, which is newer than the currently running version '4.3.0.0'. [/cs9057/Issue/Issue.csproj]

CSC : error CS9057: The analyzer assembly '/root/.nuget/packages/microsoft.extensions.telemetry.abstractions/8.3.0/analyzers/dotnet/cs/Microsoft.Gen.Metrics.dll' references version '4.4.0.0' of the compiler, which is newer than the currently running version '4.3.0.0'. [/cs9057/Issue/Issue.csproj]

I found similar issue, but so far no solution.

---

To reproduce the issue, I prepared a simple Dockerfile with required commands:

FROM mcr.microsoft.com/dotnet/sdk:6.0

WORKDIR cs9057

# create MWE
RUN dotnet new sln \
    && dotnet new classlib -f net6.0 -o Issue \
    && dotnet sln add Issue/Issue.csproj \
    && dotnet add Issue package Microsoft.Extensions.Http.Resilience

RUN dotnet build /WarnAsError

Copy into a Dockefile file and run docker build -t cs9057 .

---

Any ideas how to handle this issue?

[KalleOlaviNiemitalo]

Can you upgrade to a higher version of .NET SDK? You'd still be able to target .NET 6.0.

[g0loob]

Thanks for the quick response!

Is there a way without upgrading SDK? I need to check if I'm able to upgrade the version. The problem I have appeared in CI pipeline which builds libraries inside a Docker container with .NET 6 SDK and has /WarnAsError flag. The pipeline is generalized for all the libraries in the company.

[KalleOlaviNiemitalo]

dotnet/sdk#20355 looks related; the Microsoft.Extensions.Telemetry.Abstractions package could be changed to carry analyzers targeting multiple versions of the compiler and choose the compatible one at build time. However, I don't know whether these analyzers depend on Roslyn APIs that the older compiler doesn't support.

I don't know how necessary the source generators of that package are. It might be possible to just disable them. NuGet doesn't directly support disabling source generators or other analyzers (NuGet/Home#6279) but perhaps you could do that with a custom MSBuild target, similar to how the Microsoft.Extensions.Telemetry.Abstractions package disables the source generators of the Microsoft.Extensions.Logging.Abstractions package here:

extensions/src/Libraries/Microsoft.Extensions.Telemetry.Abstractions/buildTransitive/net6.0/Microsoft.Extensions.Telemetry.Abstractions.targets

Lines 2 to 15 in 1b7015c

	<!-- This package should replace the Microsoft.Extensions.Logging.Abstractions source generator. -->
	<Target Name="_Microsoft_Extensions_Logging_AbstractionsRemoveAnalyzers"
	Condition="'$(DisableMicrosoftExtensionsLoggingSourceGenerator)' == 'true'"
	AfterTargets="ResolveReferences">
	<ItemGroup>
	<_Microsoft_Extensions_Logging_AbstractionsAnalyzer Include="@(Analyzer)" Condition="'%(Analyzer.AssemblyName)' == 'Microsoft.Extensions.Logging.Generators' Or
	'%(Analyzer.NuGetPackageId)' == 'Microsoft.Extensions.Logging.Abstractions'" />
	</ItemGroup>
	<!-- Remove Microsoft.Extensions.Logging.Abstractions Analyzer -->
	<ItemGroup>
	<Analyzer Remove="@(_Microsoft_Extensions_Logging_AbstractionsAnalyzer)" />
	</ItemGroup>
	</Target>

[KalleOlaviNiemitalo]

My question on SDK requirements: #4736

[g0loob]

Thanks!!! I can confirm that problem is not there if I use .NET 8 SDK.