How to Resolve 'Additional Configuration Information Required' Errors When Using Mixed-Mode Assemblies in .NET?

Troubleshooting Mixed-Mode Assembly Compatibility in .NET Projects

Referencing a .NET 2.0 mixed-mode assembly within a .NET 4.0 project can trigger an error demanding "additional configuration information." This stems from the inherent compatibility challenges of mixed-mode assemblies (combining managed and unmanaged code) when integrated into newer .NET frameworks.

Configuring for Mixed-Mode Assembly Compatibility

The solution involves adjusting your application's configuration file (App.Config) by adding this element:

<startup useLegacyV2RuntimeActivationPolicy="true">
  <supportedRuntime sku=".NETFramework,Version=v4.0" version="v4.0"/>
</startup>

The crucial setting is useLegacyV2RuntimeActivationPolicy="true". This directs the Common Language Runtime (CLR) to utilize the latest .NET version (4.0 in this case) for loading the mixed-mode assembly. Without this, the CLR defaults to the 2.0 runtime, resulting in the compatibility error.

Key Considerations

This configuration is exclusively required for mixed-mode (C /CLI) assemblies. Purely managed CLR 2.0 assemblies don't necessitate these App.Config modifications. Furthermore, remember that altering this setting might affect performance; therefore, careful consideration is advised.

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