自托管服务时出现System.BadImageFormatException

Question

I have used one DLL which works perfectly fine when used in console application. But when I use this in a self-hosted WcfService , then it gives the error System.BadImageFormatException .

What could be the reason, and what is the solution for it?

Answer 1

The most likely reason is an incorrectly set platform target. The bitness of the DLL and the one of the executable must match as you can't load a 64-bit DLL into a 32-bit process (or vice-versa).

Try setting the platform target of the DLL to AnyCPU (Note that the platform target needs to be set per build configuration separately).