How Can I Reference a .NET 2.0 Mixed-Mode Assembly in a .NET 4.0 Project?-C++-php.cn

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How Can I Reference a .NET 2.0 Mixed-Mode Assembly in a .NET 4.0 Project?

Mary-Kate Olsen

Jan 23, 2025 pm 06:52 PM

How Can I Reference a .NET 2.0 Mixed-Mode Assembly in a .NET 4.0 Project?

Integrating .NET 2.0 Mixed-Mode Assemblies into .NET 4.0 Projects

Directly loading mixed-mode assemblies compiled for older .NET runtimes within newer versions (e.g., .NET 2.0 in .NET 4.0) isn't possible without specific adjustments. This necessitates additional configuration.

Configuration for Loading Mixed-Mode Assemblies

To successfully utilize a CLR 2.0 mixed-mode assembly in a .NET 4.0 project, you must modify the application's configuration file (App.Config) to include the following:

<?xml version="1.0"?>
<configuration>
  <startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime sku=".NETFramework,Version=v4.0" version="v4.0"/>
  </startup>
</configuration>

The crucial element is useLegacyV2RuntimeActivationPolicy="true". This directive instructs the Common Language Runtime (CLR) to employ the latest version (4.0 in this case) for loading the mixed-mode assembly. Omitting this will result in a loading failure.

Important Notes

This configuration is solely applicable to mixed-mode assemblies (typically C /CLI). Purely managed assemblies (.NET 2.0) do not require this App.Config modification for compatibility with .NET 4.0.

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