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Asked: 2026-05-26T03:16:44+00:00

Here’s my problem. I am wrapping a C dll in C#. To do this,

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Here’s my problem.
I am wrapping a C dll in C#. To do this, I am first writing a C++/CLI wrapper. The native C library is linked to the C++/CLI wrapper. (Linker properties in C++/cli project).

Here’s how it is all organised now:
– The native C .lib: both x86 and 64bit.

  • 1 solution containing 2 projects:
    • C++/CLI wrapper project to which is linked native C .lib
    • C# project referencing C++/CLI project

My problem comes from the fact that I need C# to target “Any CPU”. But this option is not available in C++/CLI since it compiles directly to native code.

My idea to solve this is:
– Compile C++/CLI wrapper in x86 and then change the config and compile to 64 bit. When it compiles, I would like to tell it which dll to take based on the platform. ie: if compiling in 64bit, link 64 bit native C dll, else if x86, link x86 native C.
– With this done, I should then be able to have Any CPU target in my C# platform. Here again, instead of referencing my C++/CLI wrapper project, I would reference the required dll based on the target platform.

My questions are:

  • How to I tell the C++/CLI project which .lib to link to based on the target platform?
  • How to I tell the C# project which C++/CLI dll to reference based on the target platform?

Let me add that the C# project a CLASS LIBRARY to be used by an x86 or x64 client.

I hope my question is clear enough. Any helps would be appreciated !

UPDATE based on:Conditional references in .NET project, possible to get rid of warning?…

So now I’ve edited my .csproj file using a condition to reference the dll as follows:

<ItemGroup>
    <Reference Include="AlibCppWrapper, Version=1.0.4303.21410, Culture=neutral, PublicKeyToken=c0c17a53adc44091, processorArchitecture=AMD64"
               Condition="$(Platform) == 'x64'">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>..\x64\Debug\AlibCppWrapper.dll</HintPath>
    </Reference>
    <Reference Include="AlibCppWrapper, Version=1.0.4303.21410, Culture=neutral, PublicKeyToken=c0c17a53adc44091, processorArchitecture=x86"
               Condition="$(Platform) == 'x86'">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>..\Debug\AlibCppWrapper.dll</HintPath>
    </Reference>
  </ItemGroup>

Unfortunately this doesn’t work as the $(Platform) is set to AnyCPU…

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1 Answer

  1. Editorial Team

    What you describe is known as "side-by-side assembly" (two versions of the same assembly, one 32 and the other 64 bit)… I think you will find these helpful:

    EDIT – as per comment:

    Here you can find a walkthrough for exactly your scenario: .NET DLL wrapping C++/CLI DLL referencing a native DLL

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