分割字节流为G,MB,KB的算法

　　　　　　　　　String HumanReadableFilesize(double size)
                {
                    var units = new[] { "B", "KB", "MB", "GB", "TB", "PB" };
                    double mod = 1024.0;
                    var DoubleCount = new List<double>();
                    while (size >= mod)
                    {
                        size /= mod;
                        DoubleCount.Add(size);
                    }
                    var Ret = "";
                    for (int j = DoubleCount.Count; j > 0; j--)
                    {
                        if (j == DoubleCount.Count)
                        {
                            Ret += $"{Math.Floor(DoubleCount[j - 1])}{units[j]}";
                        }
                        else
                        {
                            Ret += $"{Math.Floor(DoubleCount[j - 1] - (Math.Floor(DoubleCount[j]) * 1024))}{units[j]}";
                        }
                    }
                    return Ret;
                }