字节转换 B,KB,MB,GB

public string ConversionSize(long size) { double sizeD = size; if (sizeD < 1024) return sizeD.ToString("f1") + "B"; sizeD = sizeD / 1024d; if (sizeD < 1024) return sizeD.ToString("f1") + "KB"; sizeD = sizeD / 1024d; if (sizeD < 1024) return sizeD.ToString("f1") + "MB"; sizeD = sizeD / 1024d; return sizeD.ToString("f1") + "GB"; }