For versioning reasons it would be beneficial for me to be able to use p/invoke on a native C++ dll whose filename will be determined at runtime, as such:
[DllImport(myDllFilename)]
private static extern void MyInvokedMethod();
Unfortunately [DllImport] is an attribute and demands a constant expression. Are there any other options for getting around this error?
I am aware I can use identically named files in different folders and load the right one at runtime, but being able to use differently named files would be ideal for my case.
To achieve what you want you need to PInvoke several things (LoadLibrary and GetProcAddress - see links below)... it is called "late binding native code"... using this is not easy/recommended but it is possible...
Some relevant links with explanations, samples and source code:
There is no workaround. You will need to use LoadLibrary and GetProcAddress. That's really no fun at all so I'd try to avoid going that way if feasible.
来源：https://stackoverflow.com/questions/10367641/p-invoking-to-native-dll-with-runtime-filename