C#: Access 32-bit/64-bit DLL depending on platform

Question

we use a self-written 32bit C++ DLL from our C# applications. Now we\'ve noticed that when the C# applications are run on a 64bit system, the 64bit runtime is automatically used

Answer 1

Create a helper class that wraps both 64bit and 32bit DLLS, and use IntPtr.Size to determine which to call.

if (IntPtr.Size == 8)
{
    Helper.SomeMethod64();
}
else
{
    Helper.SomeMethod32();
}