String to bytes, c# [duplicate]

Question

I'm kindof a C# noob and I want to create a byte[] from a String[].

Here is an example:

string[] macString = new string[]{"AA","11","02","BB","A5","AA"};

And I want the following output:

byte[] mac = new byte[] { 0xAA, 0x11, 0x02, 0xBB, 0xA5, 0xAA };

Can somebody help me with this?

Or at least - that provides the relevant bits. You'll need to reassemble them a little to fit the fact that you've got an array rather than a single string, but there are various different ways of handling that. — Jon Skeet
– Jon Skeet, Commented Dec 4, 2015 at 14:13

Mariusz · Accepted Answer · 2015-12-04 14:47:33Z

0

You must convert hex string to byte:

        public static byte[] StringToByteArray(string[] hexs)
        {
            var hex = string.Join(string.Empty, hexs);

            byte[] array = Enumerable.Range(0, hex.Length)
                .Where(x => x % 2 == 0)
                .Select(x => Convert.ToByte(hex.Substring(x, 2), 16))
                .ToArray();

            return array;
        }

edited Dec 4, 2015 at 14:47

answered Dec 4, 2015 at 14:13

Mariusz

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7 Comments

Bosiwow Over a year ago

But my input is a String []

Mariusz Over a year ago

Use string.Join() method.

Bosiwow Over a year ago

If I got the string "AA1102BBA5AA", will the output be: byte[] { 0xAA, 0x11, 0x02, 0xBB, 0xA5, 0xAA } ? (How does it know if it has to split every two characters?)

sab669 Over a year ago

Why do you have to multiply str.length by sizeof(char) for the array size?

Mariusz Over a year ago

@Bosiwow Now I understand your question and updated my answer. You can read more here.

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