使用包含点的库在跨平台（ubuntu / windows）上调用p / invoke

Question

I am trying to develop a program in C# that builds and runs both in linux (ubuntu 18.04) and Windows, which references a C++ library (via p/invoke - dllimport ). My dll is imported as a EmbeddedResource , but I have also tried None Include = "..."

My C++ dll/so contains dots in the naming, and this is giving me a headache.

If I rename my file to have no dots, it works fine. When I add dots, if I do not add the extension (ie .dll in windows), I get a DllNotFoundException , and obviously I do not want to mention the extension name since I want to cross compile it.

Example:

public const string DllImport = @"myLib110";

[DllImport(DllImport)]
public static extern IntPtr myFun(float[] input);

Works fine with myLib110.dll

Where:

public const string DllImport = @"myLib1.1.0";

Breaks for file myLib1.1.0.dll .

In addition:

public const string DllImport = @"myLib1.1.0.dll";

Works fine, but I want to cross compile, so that will not work for linux, where my lib is a .so file.

Any tips/suggestions ? I also tried most of DllImport 's additional input arguments without any luck.

Answer 1

Following @PavelAnikhouski 's suggestion, I tried targeting netcoreapp3.0 instead of 2.1 as I was doing previously and incorporated the example found here .

It works very smoothly, with one exception (pun not intended):

When running my unit tests, I kept getting a InvalidOperationException from the second unit test and onwards for the NativeLibrary.SetDllImportResolver method. As microsoft mentions in their documentation for the class:

Only one resolver can be registered per assembly. Trying to register a second resolver fails with an InvalidOperationException.

But I do not understand why would that be the case for my unit tests. The workaround I did was to wrap a try/catch inside public static void Register(Assembly assembly) (Map.cs). Specifically:

try
{
    NativeLibrary.SetDllImportResolver(assembly, MapAndLoad);
}
catch (Exception e)
{
    Console.WriteLine(e);
}

Did the trick for me.