.NET 9 trimmed application fails with System.TypeLoadException (Method trimmed but interface still listed on type).

[jlaanstra]

Description

After updating to .NET 9 a trimmed application fails in debug configuration with a System.TypeLoadException: Method 'GetKeyedService' in type 'Microsoft.Extensions.DependencyInjection.ServiceProvider' from assembly 'Microsoft.Extensions.DependencyInjection, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' does not have an implementation.

Based on inspecting the trimmed dll, the ServiceProvider has the IKeyedServiceProvider interface listed but none of the methods are present.

Reproduction Steps

Create a new console app and replace Main with:

internal class Program
{
    static void Main(string[] args)
    {
        var serviceCollection = new ServiceCollection();
        serviceCollection.AddMemoryCache();
        IServiceProvider serviceProvider = serviceCollection.BuildServiceProvider();
        Console.WriteLine(serviceProvider.GetRequiredService<IMemoryCache>());
    }
}

Publish the exe and run it to make sure the trimmed exe is ran.

Expected behavior

No TypeLoadException should be thrown. A trimmed application should work just like untrimmed since there are no trim warnings.

Actual behavior

Application fails in debug configuration with a System.TypeLoadException: Method 'GetKeyedService' in type 'Microsoft.Extensions.DependencyInjection.ServiceProvider' from assembly 'Microsoft.Extensions.DependencyInjection, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' does not have an implementation.

Regression?

Yes, from .NET 8

Known Workarounds

No response

Configuration

.NET 9 on Windows 11, x64, running as AnyCPU.

Other information

Project file:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net9.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="9.0.0" />
      <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="9.0.0" />
  </ItemGroup>

</Project>

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[jlaanstra]

Also @dotnet/illink

[dotnet-policy-service]

Tagging subscribers to this area: @agocke, @sbomer, @vitek-karas
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[sbomer]

@jlaanstra I wasn't able to repro this using the code you shared. Did you publish with <PublishTrimmed>true</PublishTrimmed> in the csproj? Would you mind providing the exact repro steps (to publish and run) and dotnet version you are using? (dotnet --info output). Thanks!

[jlaanstra]

@sbomer Yes to using PublishTrimmed.

C:\Program Files\Microsoft Visual Studio\2022\Enterprise>dotnet --info
.NET SDK:
 Version:           9.0.100
 Commit:            59db016f11
 Workload version:  9.0.100-manifests.c6f19616
 MSBuild version:   17.12.7+5b8665660

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.26120
 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:
  6.0.427 [C:\Program Files\dotnet\sdk]
  7.0.120 [C:\Program Files\dotnet\sdk]
  8.0.110 [C:\Program Files\dotnet\sdk]
  8.0.403 [C:\Program Files\dotnet\sdk]
  9.0.100 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.35 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  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 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.35 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.10 [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 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.35 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 8.0.10 [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:
  x86   [C:\Program Files (x86)\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
  Not set

global.json file:
  Not found

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  https://aka.ms/dotnet/info

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  https://aka.ms/dotnet/download

Attached is a repro project. Select the Debug,AnyCPU config, then publish from VS, then run the published exe.

ConsoleApp8.zip