C# plugin-system (single custom ALC with shared assemblies)

PluginLoaderContext.cs

public class PluginLoadContext : AssemblyLoadContext
{
	public PluginLoadContext(string? name, bool isCollectible = false) : base(name, isCollectible)
	{
	}

	public void AddDependencyResolver(string componentAssemblyPath)
	{
		var resolver = new AssemblyDependencyResolver(componentAssemblyPath);

		Resolving += (_, assemblyName) =>
		{
			var assemblyPath = resolver.ResolveAssemblyToPath(assemblyName);
			return assemblyPath is null ? null : LoadFromAssemblyPath(assemblyPath);
		};

		ResolvingUnmanagedDll += (_, unmanagedDllName) =>
		{
			var assemblyPath = resolver.ResolveUnmanagedDllToPath(unmanagedDllName);
			return assemblyPath is null ? IntPtr.Zero : LoadUnmanagedDllFromPath(assemblyPath);
		};
	}
}

Program.cs

var alc = new PluginLoadContext("Plugins", true); // make the custom ALC unloadable

var plugins = Array.Empty<string>(); // List of plugins to load

foreach (var plugin in plugins)
	if (File.Exists(Path.ChangeExtension(plugin, ".deps.json")))
		alc.AddDependencyResolver(plugin); // Used to resolve the dependencies of assemblies

var assemblies = plugins.Select(plugin =>
{
	using var stream = File.OpenRead(plugin);
	return alc.LoadFromStream(stream); // this is to prevent locking the assembly file
}).ToArray();

alc.Unload(); // Unloads everything as soon as all references to the assmeblies are released