C# List 删除相同数据

  private ArrayList RemoveSame(ArrayList list)
        {
          
            for (int i = 0; i < list.Count - 1; i++)
            {
                for (int j = i + 1; j < list.Count; j++)
                {
                    if (list[i].Equals(list[j]))
                    {
                        list.RemoveAt(j);
                        j--;
                    }
                }
            }
            return list;
        }