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Unity Roslyn Updater

A tool to update the Roslyn compiler and C# language versions for a Unity installation.

Usage

NOTE: This will modify your Unity installation folder, administrative privileges are required!

UnityRoslynUpdater.exe <path to Unity Editor folder>

For example: UnityRoslynUpdater.exe "C:\Program Files\Unity\Hub\Editor\2022.3.8f1\Editor"

Using C# 12+

C# 11 is the most recent language version that works correctly with Visual Studio in a UnityRoslynUpdater-patched Unity install.

This is because the com.unity.ide.visualstudio package does not recognize newer versions, and will limit the <LangVersion> property in generated .csproj files to 11.

To work around this issue, create a Directory.Build.targets file next to your project's Assets directory containing the following (replace 12 with your desired language version):

<Project>
  <PropertyGroup>
    <LangVersion>12</LangVersion>
  </PropertyGroup>
</Project>

After you have done this, navigate to Edit -> Project Settings -> Player in Unity, and scroll down to the 'Additional Compiler Arguments' section. Add a new entry containing -langversion:12 (again replacing 12 with your desired language version).

Note that you may need to delete the Visual Studio cache directory (.vs) in order for these changes to take effect.

Language Support

• Working
  • Feature works exactly as expected.
• PolySharp
  • Feature works when using PolySharp and/or manually implementing missing APIs.
• Not Supported
  • Requires runtime features or BCL changes that Unity does not have. Attempting to use the feature may result in compiler errors.
• Crash
  • Requires runtime features that Unity does not have. Attempting to use the feature may compile, but will result in crashes.

C# 13

C# 12

C# 11

C# 10

1. Unity 2021 and earlier require UnityNamespacePatch to be installed.
2. AsyncMethodBuilderAttribute requires changes to its [AttributeUsage] attribute for this to work.