Recently, I’ve been interested in the architecture of CAD/BIM/FEA systems capable of dynamically loading external assemblies to allow for third-party plugin development. Found this great article by @RickStrahl explaining how this can be done with just a few lines of code:

https://weblog.west-wind.com/posts/2016/Dec/12/Loading-NET-Assemblies-out-of-Seperate-Folders

Recommended reading for anyone who’s interested in the mechanics of C# plugin development. The comments are of interest too, where another system called MEF is mentioned, which apparently is Microsoft’s solution the same problem.