As I've been teaching ASP.NET Core for a while now, some things I've been saying I've taken on faith. One of these was that building a Configuration Source (a provider that can read configuration and feed it into the configuration system) is fairly easy.

Everytime I add a app.config file to a new C# App, it never does what I want. I want the app.config file to be deployed to the build directory so I can make changes to the app.config file and have it propogated. With the release of VS.NET 2003, us C# developers now have pre and post build steps. So I now have to remember to add the following to the post-build event: