nuget Package 3.1.1: dll not found in .net framework 4.8.1 forms app

[c3rebro]

Hello Maxime. I tried to implement your lib again and facing issues at runtime which looks like troubles with the installer or .net wrapper.

Issue:
Installing the nuget package reference LibLogicalAccessNetCE 3.1.1 leads to "DllNotFoundException" for "LibLogicalAccessNet.native". This occurs on:
var lib = LibraryManager.getInstance()

Reproduce:
To reproduce the issue i just created a new .net framework 4.8.1 forms app. i added a reference to the nuget package and then tried to load the assembly in the form1.cs:

using (var lib = LibraryManager.getInstance())
{
   var t = lib.getReaderProvider("PCSC");
}

which throws the above error. If i create a .net 8 forms app .getInstance() is working as expected.

What i tried/did so far:

• installed vc++ redistributable 2013 and 2010 sp1
• set buildtarget from anycpu to x64 / x86
• copied LibLogicalAccess.native.dll to the output folder
• reboot machine

all to no success.

do you have any idea why this is happening?

[Maxhy]

Good to see you here again @c3rebro
Yes this is because .NET changed the way DllImport is working when the file has a dot inside the name without the explicit dll extension depending targeted version....

• With .NET framework (4.8.1 here), the generated [DllImport("LibLogicalAccessNet.native")] directive will try to load LibLogicalAccessNet.native file
• With .NET 6/7/8, the generated [DllImport("LibLogicalAccessNet.native")] directive will try to load LibLogicalAccessNet.native.dll file on Windows and LibLogicalAccessNet.native.so file on Linux.

I guess the generated file should be renamed with a dash instead to have consistent behavior between targeted .NET versions, like LibLogicalAccessNet-native...
For now to target .NET Framework, you have to rename LibLogicalAccessNet.native.dll to LibLogicalAccessNet.native 🤕

[c3rebro]

Hello Maxim,

strange behaviour. But renaming LibLogicalAccessNet.native.dll to LibLogicalAccessNet.native fixed it. Thank you. :-)