public void Enumerate()
{
var count = 0;
foreach (var position in _world)
{
var ex = _testMap.FirstOrDefault(p => p.X == position.X && p.Y == position.Y);
Assert.AreEqual(position, ex);
Assert.IsTrue(_testMap.Contains(position));
count += 1;
}
Assert.AreEqual(count, _testMap.Count);
var sw = new Stopwatch();
sw.Start();
count = _world.Count();
sw.Stop();
Assert.AreEqual(count, _testMap.Count);
Debug.WriteLine($"\n\n\n//ulong enumerate: count:{count}, ticks: {sw.ElapsedTicks }, ms:{sw.ElapsedMilliseconds}\n\n\n");
//uint enumerate: count:19959, ticks: 7375, ms:3
//uint enumerate: count:105049, ticks: 37074, ms:19
//ulong enumerate: count:9940, ticks: 8296, ms:4
//ulong enumerate: count:19950, ticks: 8976, ms:4
//ulong enumerate: count:109938, ticks: 71533, ms:36
}