Byte[] Hex字符串之间的转换

public string ToHexString(byte[] bytes) // 0xae00cf => "AE00CF "
        {
            string hexString = string.Empty;
            if (bytes != null)
            {
                StringBuilder strB = new StringBuilder();

                for (int i = 0; i < bytes.Length; i++)
                {
                    strB.Append(bytes[i].ToString("X2"));
                }
                hexString = strB.ToString();
            }
            return hexString;
        }

public byte[] hexToBytes(String src)
        {
            int l = src.Length/2;
            String str;
            byte[] ret = new byte[l];

            for (int i = 0; i < l; i++)
            {
                str = src.Substring(i * 2, 2);
                ret[i] = Convert.ToByte(str, 16);
            }
            return ret;
        }