您可以执行removeat来删除位于特定索引处的项目，并且可以检查计数查看列表包含多少项.

You can do removeat in order to remove whichever item is at a particular index and you can check the count to see how many items a List contains.

这意味着您可以执行以下操作:

Meaning you can do something like:

MyList.Add(item);
if (MyList.Count > 1000)
    MyList.RemoveAt(0);