c# 16进制大端小端解析长度

//前两个字节为长度的解析
string hexstr = "00 13 59 02 80 00 E7 00 80 00 E9 00 80 00 EA 00 80 00 EB 00 80";
byte[] hexarr= strToToHexByte(hexstr);

byte[] countarray = new byte[2];
Array.Copy(hexarr, 0, countarray, 0, 2);

short count = (short)((countarray[0] << 8) + countarray[1]);
byte[] bytearr = new byte[count];
Array.Copy(hexarr, 2, bytearr, 0, count);
string t = BitConverter.ToString(bytearr);
Console.WriteLine(t);

 private static byte[] strToToHexByte(string hexString)
        {
            hexString = hexString.Replace(" ", "");
            if ((hexString.Length % 2) != 0)
                hexString += " ";
            byte[] returnBytes = new byte[hexString.Length / 2];
            for (int i = 0; i < returnBytes.Length; i++)
                returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
            return returnBytes;
        }

//指定转换
int a = int.Parse("0013", NumberStyles.HexNumber);

//判断大端小端，vs默认小端
if (!BitConverter.IsLittleEndian)
{
       Array.Reverse(b); // 反转
}
BitConverter.ToString(array[]);
十六进制为 1A2B3C5E
小端输出 为 5E-3C-2B-1A
大端输出 为 1A-2B-3C-5E