How to solve the problem when using Properties.Settings in DllImport?

Question

C++ / C#

Hello!
If you write the path in DllImport like this:
@"C:\path\library.dll"
Then everything is fine.
But if this piece is completely replaced with this:
Properties.Settings.Default.dllPath
Then an error pops up:

I know that the @ symbol prohibits further formatting of the string (essentially a constant). Interested in how to fix it using Properties.Settings, or how to store paths of this kind in a different way, so as not to duplicate them in the code, but to pull them out of the config?

Answer 1

If you don't want to link statically, you can load it dynamically.
Example:

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
 private delegate int MultiplyByTen(int numberToMultiply);

IntPtr pDll = NativeMethods.LoadLibrary(@"PathToYourDll.DLL");
IntPtr pAddressOfFunctionToCall = NativeMethods.GetProcAddress(pDll, "MultiplyByTen");
MultiplyByTen multiplyByTen = (MultiplyByTen)Marshal.GetDelegateForFunctionPointer(
                                                                                        pAddressOfFunctionToCall,
                                                                                        typeof(MultiplyByTen));
int theResult = multiplyByTen(10);