这是一种相当简洁的方法：
static readonly string[] SizeSuffixes = { "bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };static string SizeSuffix(Int64 value, int decimalPlaces = 1){ if (decimalPlaces < 0) { throw new ArgumentOutOfRangeException("decimalPlaces"); } if (value < 0) { return "-" + SizeSuffix(-value); } if (value == 0) { return string.Format("{0:n" + decimalPlaces + "} bytes", 0); } // mag is 0 for bytes, 1 for KB, 2, for MB, etc. int mag = (int)Math.Log(value, 1024); // 1L << (mag * 10) == 2 ^ (10 * mag) // [i.e. the number of bytes in the unit corresponding to mag] decimal adjustedSize = (decimal)value / (1L << (mag * 10)); // make adjustment when the value is large enough that // it would round up to 1000 or more if (Math.Round(adjustedSize, decimalPlaces) >= 1000) { mag += 1; adjustedSize /= 1024; } return string.Format("{0:n" + decimalPlaces + "} {1}", adjustedSize, SizeSuffixes[mag]);}这是我建议的原始实现，可能会稍慢一些，但易于遵循：
static readonly string[] SizeSuffixes = { "bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };static string SizeSuffix(Int64 value, int decimalPlaces = 1){ if (value < 0) { return "-" + SizeSuffix(-value); } int i = 0; decimal dValue = (decimal)value; while (Math.Round(dValue, decimalPlaces) >= 1000) { dValue /= 1024; i++; } return string.Format("{0:n" + decimalPlaces + "} {1}", dValue, SizeSuffixes[i]);}Console.WriteLine(SizeSuffix(100005000L));
