How to Load C Shared object file (.so) file in .Net core

I am having one .so file which I want to use in .Net core.

Once I use the same library in c with below code it is working fine but I don't know how to add these references in .Net Core.

**Code in C**

add_library(capi SHARED IMPORTED)
set_target_properties(capi PROPERTIES
IMPORTED_LOCATION "/opt/lib/libcapi.so"
INTERFACE_INCLUDE_DIRECTORIES "/home/src/api/capi/include;/home/src/api/capi/include/Linux";
C_STANDARD 11 )

Note: INTERFACE_INCLUDE_DIRECTORIES is having header files.

In .Net core I am using the code as mentioned below. I added the reference of .so file only, Please let me know how I will add the references to INTERFACE_INCLUDE_DIRECTORIES in .net Core.

class Program
{
[DllImport(@"\TestApp\libcapi.so")]
public static extern bool CreateDomain(object hProvider, string nHndType, string szName, string szName1, bool test);

static void Main(string[] args)
{
var d = CreateDomain(null, "", "", "", true);
Console.ReadKey();
}
}

**Current Error:**
System.BadImageFormatException
HResult=0x8007000B
Message=An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)
Source=TestApp
StackTrace:
at TestApp.Program.SL_CreateDomain(Object hProvider, String nHndType, String szName, String szName1, Boolean test)
at TestApp.Program.Main(String[] args) in D:\Projects\R&D\.Net Core\TestApp\TestApp\Program.cs:line 13

I am not having any idea about how to add INTERFACE_INCLUDE_DIRECTORIES in .net core.
If anything else required please let me know.