How to parse bits array to byte array in c#?

Question

This question is very close to Bit array to Byte array in JAVA, I want to convert the following bit array to a byte array?

int[] bits = {1, 0, 1, 0, 1, 1, 0, 1, 0, 1};

But different to the answer is the relevant question, I want to store the result big-endian which should be:

0xB5 0x02

How I suppose to do this? Thanks!

Are you asking how to convert int to ushort? Any code attempts you can share? — elirandav
– elirandav, Commented Jul 14, 2017 at 10:30
bits array are not a c# type perhaps you mean byte ? or System.Collections.BitArray ? — Jimbot
– Jimbot, Commented Jul 14, 2017 at 10:32

Aleks Andreev · Accepted Answer · 2017-07-16 11:53:15Z

2

Try this code:

byte[] result = bits.Select((x, i) => new {byteId = i / 8, bitId = i % 8, bit = x})
    .GroupBy(x => x.byteId)
    .Select(x => (byte) x.Reverse().Aggregate(0, (t, n) => t | n.bit << n.bitId))
    .ToArray();

edited Jul 16, 2017 at 11:53

answered Jul 14, 2017 at 20:14

Aleks Andreev

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1 Comment

BarryLib Over a year ago

Thanks for your reply. Your code seems not meet the needs. For example, when my bits[] are1 1 0 0 0 0 0 0 I want the result be 3 not 192

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