Rendering an ASP.NET Core MVC action to a string

I'm currently going through my "build a static site engine" phase that most developers pass through at some point in their career. As part of this, I wanted to write a normal ASP.NET Core application complete with server-side rendering, and then have the option to entirely pre-render it to disk.

It turns out that this is quite difficult -- StackOverflow and GitHub issues were a barren wasteland of half-working answers. Most everyone assumes that you have a ControllerContext, or at least an HttpContext! Rendering it from a command line application was unheard of!

After much experimentation, I managed to get it working! You can see a complete continue.

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