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How to Resolve "Additional Configuration Information Required" Errors When Using Mixed-Mode Assemblies in .NET?
Posted on 2025-03-22
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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:
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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