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CSharpRepl
A command line C# REPL with syntax highlighting – explore the language, libraries and nuget packages interactively.
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For REPLs, there are options like (my own) https://github.com/waf/CSharpRepl which stand on top of the Roslyn compiler infrastructure, which is quite extensive and can easily evaluate standalone functions and statements.
It's still nowhere close to the REPLs of lisp and smalltalk, but it's a step in a more flexible direction.
Not to make you feel too bad, but based on your sentence you may appreciate a recent addition to my personal REPL toolkit in Clojure which I very much enjoy.
You may remember the rich comment forms in Clojure development as a communication tool to your future self and others. Now someone made them testable https://github.com/hyperfiddle/rcf#readme