C#之BitConverter.ToInt16

byte[] bytes =
{
    1,3
};
short s = BitConverter.ToInt16(bytes,0);
Console.WriteLine(s);

从低位到高位填充:
0000 0003 0000 0001

3*2^8+1=769;

       byte[] bytes =
       {
           0x21,0x31
       };
       short s = BitConverter.ToInt16(bytes,0);
       Console.WriteLine(s);

从低位到高位填充:
0003 0001 0002 0001
32^12+1*28+22^4+1=12577

 byte[] bytes =
 {
     0xAB,0xCD
 };
 short s = BitConverter.ToInt16(bytes,0);
 Console.WriteLine(s);

首先，D->1101,C->1100,B->1011,A->1010,
组装到一起为:
CDAB，即1100 1101 1010 1011
最高位为1，表明是负数，值为原码的反码+1，
反码为0011 0010 0101 0100,
补码为0011 0010 0101 0101,
为2⁰⁺²2+2⁴⁺²6+2⁹⁺²12+2^13=12885,
但为负数，即为-12885