Convert an integer array to a byte array

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C#

I'm looking a way to convert Integer array to byte array in c# in order to work with an existing database design?

Posted 13-Sep-15 0:53am

Kasthuri Gunabalasingam

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Mehdi Gholam 13-Sep-15 7:12am

Show some code and context of what you mean.

3 solutions

Solution 2

Luckily I do exactly this in one of my apps.
Here's the code:

XML

public static byte[] IntArrayToByteArray(int[] ints)
{

    List<byte> bytes = new List<byte>(ints.GetUpperBound(0) * sizeof(byte));

    foreach (int integer in ints)
    {

        bytes.Add(BitConverter.GetBytes(integer)[0]);

    }

    return bytes.ToArray();

}

Some will see this as clunky, however other methods I have tried(don't ask me which ones as since they didn't work I don't remember...) did not always convert the integer to the correct byte representation - there is information on this 'feature' out on google somewhere...

Posted 13-Sep-15 1:54am

GuyThiebaut

Updated 13-Sep-15 2:05am

v2

Comments

Member 13401733 1-Feb-18 17:27pm

You might want to test this code again because it's bugged

GuyThiebaut 2-Feb-18 2:56am

I have just tested it an it worked as expected - please provide detail as to how it is 'bugged'.

Member 13401733 4-Feb-18 8:00am

class Program
{
static void Main(string[] args)
{
Int16[] ints = new Int16[] {64, 1025, 8193};

byte[] bytes = IntArrayToByteArray(ints);

Debug.Assert(bytes.Length == 6, "3 x Int16 should return 6 bytes");

if (BitConverter.IsLittleEndian)
{
Debug.Assert(bytes[0] == 64 && bytes[1] == 0, "Bytes are NOT in correct order or failed to convert INT16 to bytes");
Debug.Assert(bytes[2] == 4 && bytes[3] == 1, "Bytes are NOT in correct order or failed to convert INT16 to bytes");
Debug.Assert(bytes[4] == 1 && bytes[3] == 32, "Bytes are NOT in correct order or failed to convert INT16 to bytes");
}

}

public static byte[] IntArrayToByteArray(Int16[] ints)
{

List<byte> bytes = new List<byte>(ints.GetUpperBound(0) * sizeof(byte));

foreach (Int16 integer in ints)
{

bytes.Add(BitConverter.GetBytes(integer)[0]);

}

return bytes.ToArray();

}
}

Solution 3

//Covert To byte Array

C#

public byte[] ConvertIntArrayToByteArray(int[] inputElements)
      {
          byte[] myFinalBytes = new byte[inputElements.Length * 4];
          for(int cnt = 0 ; cnt<inputElements.Length; cnt ++)
          {
              byte[] myBytes = BitConverter.GetBytes(inputElements[cnt]);
              Array.Copy(myBytes, 0, myFinalBytes, cnt*4, 4);
          }
          return myFinalBytes;
      }

//Convert To Integer Array

C#

public int[] ConvertToInt32Array(byte[] inputElements)
       {
           int[] myFinalIntegerArray = new int[inputElements.Length / 4];
           for (int cnt = 0; cnt < inputElements.Length; cnt += 4)
           {
               myFinalIntegerArray[cnt / 4] = BitConverter.ToInt32(inputElements, cnt);
           }
           return myFinalIntegerArray;
       }

//Call from your application:

byte[] myFinalBytes= test.ConvertIntArrayToByteArray(inputElements);
           int [] myIntegerArray = test.ConvertToInt32Array(myFinalBytes);

Help Link For BitConverter Class <a href="https://msdn.microsoft.com/en-us/library/de8fssa4(v=vs.110).aspx">https://msdn.microsoft.com/en-us/library/de8fssa4(v=vs.110).aspx</a>[<a href="https://msdn.microsoft.com/en-us/library/de8fssa4(v=vs.110).aspx" target="_blank" title="New Window">^</a>]

Posted 13-Sep-15 2:08am

Gaurav B Sinha

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OriginalGriff · Accepted Answer · 2015-09-13T01:53:00

Depends what exactly you are trying to do.
If you have an array of integers and you want to convert it to a stream of bytes so you can regenerate the same array later, then try Buffer.BlockCopy[^]

C#

byte[] bytes = new byte[arrayOfInts.Length * sizeof(int)];
Buffer.BlockCopy(arrayOfInts, 0, bytes, 0, byte.Length);

If you are trying to convert individual values to a byte each then use Linq:

C#

byte[] bytes = arrayOfInts.Select(i => (byte) i).ToArray();