A lightweight toolkit that bridges Unity 6+ to modern C# language features.
Unity Editor → Window ▸ Package Manager
➕ Add package from Git URL
https://github.com/Braneloc/ModernCSBridgeUnity.git
Unity downloads the package and recompiles scripts automatically.
Your project **must ** be compiling correctly before/while installing (ie not using C#10+ features)
- Full usage of C# 10+ for Unity
- Support for records and init-only setters.
- Unity compiles C# projects in “9.0” mode by default. New syntax such as record, init setters, and enhanced switch expressions may fail to compile or show IDE errors.
- System.Runtime.CompilerServices.IsExternalInit is missing in Unity’s .NET Standard 2.1 runtime, causing CS0518 when you compile records or use init.
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Every time Unity regenerates its C# project files, the bridge bumps the LangVersion element to latest version of C#. No manual action required.
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Manual stub generation
Right‑click any folder in the Project window and choose either menu path:
Create ▸ Support Code ▸ IsExternalInit
Create ▸ Scripting ▸ IsExternalInit
If IsExternalInit.cs already exists in that folder, the command overwrites it in place. The stub is wrapped in #if !NET8_0_OR_GREATER, so it compiles away automatically once Unity moves to a .NET 8‑based runtime that includes the real type. -
Menu option to create the compiler settings csc.rsp in the ROOT folder of your ASSETS, or next to the Assembly Definition if you are using them. Right‑click either the root or assembly folder in the Project window and choose either menu path:
Create ▸ Support Code ▸ csc.rsp
Create ▸ Scripting ▸ csc.rsp -
Bonus: Under Unity Project Settings, Player, it might be helpful to add under additonal compiler arguments:
-langversion:latest
