C# Testing Playgrounds for old versions?

This page summarizes the projects mentioned and recommended in the original post on /r/dotnet

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  1. ILSpy

    .NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!

    Well, it might not be exactly what you're asking for, but ILSpy lets you choose what version of C# you wish to decompile an assembly to. This is great for learning how a specific feature used to be coded in C# prior to some new syntax/compiler feature being added.

  2. CodeRabbit

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  3. SharpLab

    .NET language playground

    The closest online tool I can think of would be SharpLab, but you can only choose between Roslyn's git branches instead of C# versions.

  4. AvaloniaILSpy

    Avalonia-based .NET Decompiler (port of ILSpy)

    Keep in mind there's AvaloniaILSpy for non-Windows users.

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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the 10th most popular programming language
based on number of references?