How to enable C# 11 preview

Unity Engine
1

Hi,

I just read this blog post about Generic Attributes in C# 11 here https://prographers.com/Blog/first_class_support_for_attributes_in_cs11 and I wonder how I can enable C# 11 preview in Unity. So that I can use this feature as it would be very useful for my use case?

Thank you

2

Is it even supported in Unity? Start there… check the main Unity technical docs and official blogs, not some random blogger.

3

that could cause unity to crash unexpectedly if you can even call it that, its like using a Windows 11 sdk to program a Windows 10 app. some functions and stuff will not be available in the older version, in this case Unity’s version of c# may only be 10.0 which would result in
X does not exist in the current context
the namespace X could not be found
could not import X
could not find X

and so on.
so the answer, check unity for c# version, if its below 11.0, then dont touch anything.

4

You can’t.

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5

You absolutely can use the csharp 11 compiler features, but NOT the more modern dotnet features that come with it (ref fields, static abstract, etc)

ZLogger provides a tutorial in their installation guide: GitHub - Cysharp/ZLogger: Zero Allocation Text/Structured Logger for .NET with StringInterpolation and Source Generator, built on top of a Microsoft.Extensions.Logging.

Prerequirements:

    Install NuGetForUnity
        Required to install the dlls of ZLogger and its dependencies.
    Install CsprojModifier
        Required to develop in the IDE with a new language version.
    Install ZLogger.Unity package via git url.
        Add https://github.com/Cysharp/ZLogger.git?path=src/ZLogger.Unity/Assets/ZLogger.Unity to Package Manager

Installation steps:

    Setup the C# compiler for unity.
        Add a text file named csc.rsp with the following contents under your Assets/.

            -langVersion:10 -nullable

    Note:
        If you are using assembly definition, put it in the same folder as the asmdef that references ZLogger.
        If you are using Unity 2022.3.12f1 or newer, you can use langVersion:preview allows parts of C# 11 features.

Setup the C# compiler for your IDE.

    Add a text file named LangVersion.props with the following contents

        <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
          <PropertyGroup>
            <LangVersion>10.0</LangVersion>
            <Nullable>enable</Nullable>
          </PropertyGroup>
        </Project>

Open Project Settings and [C# Project Modifier] section under the [Editor].
Add the .props file you just created, to the list of [Additional project imports].
Note:

    If you are using assembly definition, add your additional csproj in the list of [The project to be addef for import].
    If you want to use ZLoggerMessage Source Generator, require Unity 2022.3.12f1 and change to <LangVersion>11</LangVersion>
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