C# Testing Playgrounds for old versions?

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

InfluxDB - Power Real-Time Data Analytics at Scale
Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
www.influxdata.com
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SaaSHub - Software Alternatives and Reviews
SaaSHub helps you find the best software and product alternatives
www.saashub.com
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  • 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.

  • 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.

  • InfluxDB

    Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

    InfluxDB logo
  • 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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