Source Generator to support Domain Reload off in Unity (handle static fields and event handlers).

You have two ways to use this repository:

• Download the latest release from here.
• Extract the DLL file somewhere into your Assets folder.
• Continue below at the "Finishing" section

• Clone the repo
• Open up in your favorite IDE
• Build the solution
• Copy the <repo path>\bin\Release\netstandard2.0\DomainReloadSG.dll somewhere into your Assets folder

• Follow the instructions here:

• Inside the Asset Browser, click on the .dll file to open the Plugin Inspector window.
• Go to Select platforms for plugin and disable Any Platform.
• Go to Include Platforms and disable Editor and Standalone.
• Go to Asset Labels and open the Asset Labels sub-menu.
• Create and assign a new label called RoslynAnalyzer. To do this, enter “RoslynAnalyzer” into the text input window in the Asset Labels sub-menu. This label must match exactly and is case sensitive. After you create the label for the first analyzer, The label appears in the Asset Labels sub-menu. You can click on the name of the label in the menu to assign it to other analyzers.

• The class you're augmenting has to be decorated with the partial keyword.
• Currently there is no way of excluding classes, static fields or event handlers from this service.
• If you're using extra namespaces currently you need to explicitly write it in the code as opposed of in a using statement.

using UnityEngine;

public partial class TestStaticOnNoDomainReload : MonoBehaviour
{

    private static int _number;
    
    private void Start()
    {
        Debug.Log($"Started with {_number}");
        _number += 10;
        Application.quitting += OnQuit;
        Debug.Log($"Ended with {_number}");
    }

    private static void OnQuit() => Debug.Log("Exiting");
}

The result after entering play mode twice:

Obviously the Edit > Project Settings > Editor > Enter Play Mode is set and the Reload Domain is not set.

The generated source code: TestStaticOnNoDomainReload_codegen.cs

using System;
using UnityEngine;

    public partial class TestStaticOnNoDomainReload 
    {
        [UnityEngine.RuntimeInitializeOnLoadMethod(UnityEngine.RuntimeInitializeLoadType.SubsystemRegistration)]
        static void ApplyStaticFieldsAndEventHandlers()
        {
			_number = default;
			Application.quitting -= OnQuit;

        }
    }