To resolve issues with Visual Studio not recognizing Unity code, you should check the integration between Unity and Visual Studio. Here are a few steps you can follow:
Check Unity External Tools Settings
In Unity, go to Edit > Preferences > External Tools, and make sure Visual Studio 2022 is selected as the external script editor.
Verify Visual Studio Editor Package
In Unity, go to Window > Package Manager, and check that the Visual Studio Editor package is installed and up to date. If it's missing or outdated, install or update it.
Ensure Unity Workload is Installed in Visual Studio
Open Visual Studio 2022 and go to Tools > Get Tools and Features. In the Visual Studio Installer, make sure the Game development with Unity workload is installed.
If any of these are misconfigured or missing, Visual Studio may not properly recognize Unity code, resulting in build errors or missing references. Once everything is correctly set up, Unity and Visual Studio should work together seamlessly.
If you've verified all the above settings and it still doesn't work, please provide more details about the specific errors or build issues you're encountering. That would help in diagnosing the problem further.
Also, keep in mind that when using tools like ILSpy to reverse-engineer or decompile Unity games, the resulting code may be incomplete or corrupted, which can often lead to various unexpected errors when trying to rebuild or modify the project.