BadImageFormatException or An attempt was made to load a program with an incorrect format

c# pinvoke C++程序异常：
BadImageFormatException or “An attempt was made to load a program with an incorrect format”
 
 
原因
 
dll平台不兼容。x64 编译 的c++ dll 而 c# 项目里设置了prefer 32bit , 或 x32 编译的 c++ 被 c#调用.
解决方案：
c#的platform指向与c++相同的OS编译环境即可。