什么是在C＃中处理条件依赖的最佳方法

We're building an C# .NET app which will be running on computers sitting inside trucks. We need to talk to Digital IO ports on the truck computers which do not exist on our developer machines, so I need to write a dummy library which will be included in our dev builds, but will be replaced with our actual Digital IO library when we do releases. And I want this library substitution to be automated by the build process.We're building an C# .NET app which will be run