`dotnet format` raises native AOT warnings regardless of `<EnableConfigurationBindingGenerator/>`

[cfbao]

Describe the bug

In a native AOT project that uses configuration binding with <EnableConfigurationBindingGenerator/>, there should be no warnings on the use of configuration binding methods like

• OptionsBuilderConfigurationExtensions.BindConfiguration
• ConfigurationBinder.GetValue<T>.

However, dotnet format continues to raise IL2026 and IL3050 on such projects.

To Reproduce

<!-- worker.csproj -->
<Project Sdk="Microsoft.NET.Sdk.Worker">
	<PropertyGroup>
		<TargetFramework>net9.0</TargetFramework>
		<Nullable>enable</Nullable>
		<ImplicitUsings>enable</ImplicitUsings>
		<InvariantGlobalization>true</InvariantGlobalization>
		<PublishAot>true</PublishAot>
		<EnableConfigurationBindingGenerator>true</EnableConfigurationBindingGenerator>
	</PropertyGroup>
	<ItemGroup>
		<PackageReference Include="Microsoft.Extensions.Hosting" Version="9.0.0" />
		<PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="9.0.0" />
	</ItemGroup>
</Project>

// Program.cs
using Microsoft.Extensions.Options;

var builder = Host.CreateApplicationBuilder(args);
builder.Services.AddOptions<Foo>().BindConfiguration("Foo");
builder.Services.AddHostedService<Worker>();
builder.Build().Run();

class Foo
{
	public Bar? Bar { get; init; }
}
class Bar
{
	public string? Baz { get; init; }
}
class Worker(ILogger<Worker> logger, IOptions<Foo> options) : BackgroundService
{
	protected override async Task ExecuteAsync(CancellationToken stoppingToken)
	{
		while (!stoppingToken.IsCancellationRequested)
		{
			logger.LogInformation("Baz: {baz}", options.Value.Bar?.Baz);
			await Task.Delay(1000, stoppingToken);
		}
	}
}

// appsettings.json
{
	"Logging": {
		"LogLevel": {
			"Default": "Information",
			"Microsoft.Hosting.Lifetime": "Information"
		}
	},
	"Foo": {
		"Bar": {
			"Baz": "Hello, World!"
		}
	}
}

dotnet build & dotnet publish & IDEs don't raise any warnings as expected.

However, dotnet format --verify-no-changes returns with exit code 2 and the following output:

C:\worker\Program.cs(4,1): warning IL2026: Using member 'Microsoft.Extensions.DependencyInjection.OptionsBuilderConfigurationExtensions.BindConfiguration<TOptions>(OptionsBuilder<TOptions>, String, Action<BinderOptions>)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. TOptions's dependent types may have their members trimmed. Ensure all required members are preserved. [C:\worker\worker.csproj]
C:\worker\Program.cs(4,1): warning IL3050: Using member 'Microsoft.Extensions.DependencyInjection.OptionsBuilderConfigurationExtensions.BindConfiguration<TOptions>(OptionsBuilder<TOptions>, String, Action<BinderOptions>)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Binding strongly typed objects to configuration values may require generating dynamic code at runtime. [C:\worker\worker.csproj]

Further technical details

dotnet --info output:

.NET SDK:
 Version:           9.0.100
 Commit:            59db016f11
 Workload version:  9.0.100-manifests.3068a692
 MSBuild version:   17.12.7+5b8665660

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19045
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Program Files\dotnet\sdk\9.0.100\

.NET workloads installed:
There are no installed workloads to display.
Configured to use loose manifests when installing new manifests.

Host:
  Version:      9.0.0
  Architecture: x64
  Commit:       9d5a6a9aa4

.NET SDKs installed:
  8.0.404 [C:\Program Files\dotnet\sdk]
  9.0.100 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 8.0.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 9.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.33 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 9.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 8.0.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 8.0.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 9.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  None

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download

IDE: VS Code 1.95.3 + C# extension v2.57.28

[rmannibucau]

+1, this is quite bothering

[LevYas]

Still bothers after half a year. A fix for that would be nice.

[conniey]

I recently ran into this problem as well. We want to make sure contributors only add AOT compatible code to our product but this error prevents us from using IConfiguration. :( This is challenging because it is the recommended way to grab configuration values when using Microsoft.Extensions.Hosting