迭代沒有元素的數組或列表，foreach 似乎比 for 慢。運行下面的代碼，我得到的結果是：3ms143ms7msforeach真的很慢還是我做錯了什么？var l = new List<int>();var watch = new Stopwatch();var test = 0;watch.Start();for (int i = 0; i < 10000000; i++)     if (l.Count > 0)         test = 1;watch.Stop();Debug.Log(watch.ElapsedMilliseconds);watch.Reset();watch.Start();for (int i = 0; i < 10000000; i++)     foreach (var item in l)         test = 1;watch.Stop();Debug.Log(watch.ElapsedMilliseconds);watch.Reset();watch.Start();for (int i = 0; i < 10000000; i++)     for (int j = 0; j < l.Count; j++)         test = 1;watch.Stop();Debug.Log(watch.ElapsedMilliseconds);