web terminal (.net core based preferred)

I was looking for the following:

1. Ability to host a website, which looks like a Command Line Interface.
2. Executes commands that are defined on server.
   • Definition of such commands could be function based, for e.g.,

    [CLI]
    public static void Function1(int param1, string param2) { ... Output.post("output to web command line"); ... }

3. If there is an example off .net core tech, that would be awesome.

Appreciate the pointers.