Convert bitarray to hexadecimal string

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I would like to create a concatenation of bits then display the result as a hexadecimal string. A little bit like the Windows Calculator does except I want to generate a lot a hexadecimal string from a script. I already did the code but the result is not what I expected and I cannot explain why:

What I have tried:

Here is my code

C#

BitArray headerBits = new BitArray(new bool[] { false, false, true, true, false, false, false, false }); // 8
BitArray filterBits = new BitArray(new bool[] { false, true, true });  // 11
BitArray PartitionBits = new BitArray(new bool[] { true, false, true });  // 14
BitArray CompanyPrefixBits = new BitArray(new bool[] { false, false }); // 16

BitArray newBitArray = new BitArray(headerBits.Cast<bool>()
	.Concat(filterBits.Cast<bool>())
	.Concat(PartitionBits.Cast<bool>())
	.Concat(CompanyPrefixBits.Cast<bool>())
	.ToArray());
var byteArray = newBitArray.ToByteArray();
Console.WriteLine($"{BitConverter.ToString(byteArray, 0)}");

Result in condole is 0C-2E. I expected 3074. When I write 0011 0000 0111 0100 in Microsoft Windows Calculator in Programmer mode the HEX value is 3074. And this seems correct to me.

Posted 13-Sep-18 0:52am

Bastien Vandamme

Updated 13-Sep-18 8:25am

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Sinisa Hajnal 13-Sep-18 7:09am

You need to convert each 4 bits independently. You code works in reverse order, if you check it from right to left, you'll see 2E 0C.

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Richard Deeming · Answer 1 · 2018-09-13T08:25:00

The BitArray stores the bits in a series of int values, starting with the least significant bit.

Passing in false, false, true, true, false, false, false, false is equivalent to 0b0000_1100, not 0b0011_0000.

The integer value you have stored in your newBitArray is 0b0010_1110_0000_1100, which is 0x2E0C.

But because you're pulling out a single byte at a time, you're getting them in reverse - 0x0C, followed by 0x2E.

It's not entirely clear what you're trying to achieve, but you might have better luck with the BigInteger class[^].