BCD转字符串

///

/// BCD转字符串
///

///
/// 偏移量
/// 数字字符串位数
///
///
public static string BCDToString(byte[] bcdNum, int offset, int numlen)
{
string retString = "";
int res;
var len = Math.DivRem(numlen, 2, out res);
if (res != 0)
{
len++;
}

        for (int i = 0; i < len; i++)
        {
            retString += ((bcdNum[i + offset] & 0xf0) >> 4).ToString("x");
            retString += (bcdNum[i + offset] & 0xf).ToString("x");
        }
        return retString.ToLower().Replace("f", "");
    }