在 C# 中将 int 转换为字节为 HEX

Question

I need to send a Hex string over the serial to a device, I do that now like this:

byte[] c = new byte[3];
c[0] = 0x57;
c[1] = 0x30;
ComPort.Write(c,0,c.Length );

Now I need to convert a value of int like 30 to c[1] = 0x30 or a int value of 34 gives c[1] = 0x34 . I hope you see what I mean.

So how can I mange this?

Answer 1

This format is called binary-coded decimal . For two-digit numbers, integer-divide by ten and multiply by sixteen, then add back the remainder of the division by ten:

int num = 45;
int bcdNum = 16*(num/10)+(num%10);

Answer 2

另一种方法是

c[1] = Convert.ToByte(num.ToString(), 16);

Answer 3

suppose int Data=2821; was to send over COM Port:

c[0]= Convert.ToByte(data & 0x00FF); 

c[0]= Convert.ToByte(data & 0xFF00) >> 8);

ComPort.Write(c,0,c.Length );

Answer 4

int num = 1366;
string bcdNum = num.ToString("X");
if (bcdNum.Length < 2)
bcdNum = "0" + bcdNum;
byte[] bytes_str=Enumerable.Range(0, bcdNum.Length).Where(x => x % 2 == 0).Select(x => Convert.ToByte(bcdNum.Substring(x, 2), 16)).ToArray();