Problems while Importing a C++ managed dll to C#.NET Project

Question

It seems like a duplicate question from the title, but let me clarify that I have already searched and followed different methods.
Basically I have to import a managed C++ dll into a C# project. I consulted some tutorials and finally created a managed C++ dll . Now while importing the dll I got the following error:

An attempt was made to load a program with an incorrect format

I found some solutions like this but these solutions could not help me . Before facing this error I had to consult this solution and then this one too.

Here's a screenshot of how I am trying to import the dll :

Settings:

Code:

Someone please guide me about the right way to import the dll in my project.

Answer 1

This C++ library is for certain architecture (x64 or x86). C# on the other hand is not(Any CPU), that is why this kind of error - C# most likely assumes You have a x64 unmanaged library. You should restrict the architecture in C# project to either of these (x64 or x86) so in both projects they are the same.

Answer 2

Should you not be copying the file as a pre-build step? Make sure it is in the correct location before the build. I would also remove the exit 0 , it's not needed.

That DllImport is usual for native C-style APIs, not the managed and C++/CLI assemblies. These .Net assemblies, be they mixed mode or not, can be added in the usual assembly dependency locations.

If this is a "Managed C++" and not a "C++/CLI" assembly, it may also be incompatible with the target .Net framework.