Version: 2019.1 (switch to 2018.3 or 2017.4)
Writing and executing tests in Unity Test Runner
IL2CPP
Other Versions

C# compiler

To compile C# source code in a Unity Project, the Unity Editor uses a C# compiler. The C# compiler that Unity uses depends on the Scripting Runtime Version option in the Player Settings (menu: Edit > Project SettingsA broad collection of settings which allow you to configure how Physics, Audio, Networking, Graphics, Input and many other areas of your Project behave. More info
See in Glossary
> Player > Other Settings).

Scripting Runtime Version C# compiler C# language version
.NET 3.5 equivalent mcsThe Mono C# compiler file format. More info
See in Glossary
C# 4
.NET 4.6 equivalent Roslyn C# 7.3

The Editor passes a default set of options to the C# compiler. To pass additional options in your project, see the documentation for Platform Dependent Compilation.


C# compiler Roslyn compiler NewIn20183

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Writing and executing tests in Unity Test Runner
IL2CPP