Helper to generate Object IDs for debugging (to identify the same object via a number)

DebugHelper.cs

using System;
using System.Runtime.CompilerServices;

public static class DebugHelper
{
    private static readonly ConditionalWeakTable<object, object> _objectIds = new ConditionalWeakTable<object, object>();
    private static int _lastObjectId;
    private static readonly object _lock = new object();

    public static string GetObjectId(object obj)
    {
        if (obj == null)
            return "null";

        if (_objectIds.TryGetValue(obj, out var objectId))
            return $"#{objectId}";

        lock (_lock)
        {
            if (_objectIds.TryGetValue(obj, out objectId))
                return $"#{objectId}";

            _objectIds.Add(obj, ++_lastObjectId);

            if (_objectIds.TryGetValue(obj, out objectId))
                return $"#{objectId}";

            throw new Exception("Couldn't generate object Id.");
        }
    }
}