将int转换为不同大小的字节数组

Question

I have a byte array result . I would like to convert my type called Info which are all int to the byte array but all of them are in different size.

a = 4 bytes

b = 3 bytes

c = 2 bytes

d = 1 bytes

This is the code I've tried.

private byte[] getInfoByteArray(Info data)
{
    byte[] result = new byte[10];
    BitConverter.GetBytes((data.a)).CopyTo(result, 0);
    BitConverter.GetBytes((data.b)).CopyTo(result, 4);
    BitConverter.GetBytes((data.c)).CopyTo(result, 7);
    result [9] = Convert.ToByte(data.d);

    return result;
    }

However, I found out that BitConverter.GetBytes returns 4 bytes.

Are there any general solutions that can get different size of bytes to a byte array?

Answer 1

Use Array.Copy(Array, Int32, Array, Int32, Int32) method:

byte[] result = new byte[10];
Array.Copy(BitConverter.GetBytes(data.a), 0, result, 0, 4);
Array.Copy(BitConverter.GetBytes(data.b), 0, result, 4, 3);
Array.Copy(BitConverter.GetBytes(data.c), 0, result, 7, 2);
Array.Copy(BitConverter.GetBytes(data.d), 0, result, 9, 1);

This assumes little endian hardware. If your hardware is big endian, use

byte[] result = new byte[10];
Array.Copy(BitConverter.GetBytes(data.a), 0, result, 0, 4);
Array.Copy(BitConverter.GetBytes(data.b), 1, result, 4, 3);
Array.Copy(BitConverter.GetBytes(data.c), 2, result, 7, 2);
Array.Copy(BitConverter.GetBytes(data.d), 3, result, 9, 1);