How to split byte array and assign to a byte variable?

Question

In my C# Application, I have a byte array as follows.

byte[] byteArray = {0x2, 0x2, 0x6, 0x6};

I need to split the first two elements i.e 0x2 and 0x2 and assign it to a byte variable. Similarly last two elements should be assigned to another byte variable.

i.e

byte FirstByte = 0x22;
byte SecondByte = 0x66;

I can split the array into sub arrays but I am not able find a way to convert byteArray into a single byte.

Simply listing your requirements and asking for help is not a good way to ask a question on this site. Please see Why is "Can someone Help me" not an "actual" question. Show us how you tried to solve the problem yourself, then show us exactly what the result was, and tell us why you feel it didn't work. — John Saunders
– John Saunders, Commented May 5, 2015 at 12:17

Matthew Watson · Accepted Answer · 2015-05-05 12:12:47Z

4

You can just bitwise OR them together, shifting one of the nibbles using <<:

byte firstByte  = (byte)(byteArray[0] | byteArray[1] << 4);
byte secondByte = (byte)(byteArray[2] | byteArray[3] << 4);

You didn't specify the order in which to combine the nibbles, so you might want this:

byte firstByte  = (byte)(byteArray[1] | byteArray[0] << 4);
byte secondByte = (byte)(byteArray[3] | byteArray[2] << 4);

answered May 5, 2015 at 12:12

Matthew Watson

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