C# Arrays – How to Convert a Byte Array into an Int Array

arraysc++

How to Convert a byte array into an int array? I have a byte array holding 144 items and the ways I have tried are quite inefficient due to my inexperience. I am sorry if this has been answered before, but I couldn't find a good answer anywhere.

Best Answer

Simple:

//Where yourBytes is an initialized byte array.
int[] bytesAsInts = yourBytes.Select(x => (int)x).ToArray();

Make sure you include System.Linq with a using declaration:

using System.Linq;

And if LINQ isn't your thing, you can use this instead:

int[] bytesAsInts = Array.ConvertAll(yourBytes, c => (int)c);

Related Solutions

C# – Converting int[] to byte[]

If you want a bitwise copy, i.e. get 4 bytes out of one int, then use Buffer.BlockCopy:

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

Don't use Array.Copy, because it will try to convert and not just copy. See the remarks on the MSDN page for more info.

C# – Convert Byte Array to Int

BitConverter is the correct approach.

Your problem is because you only provided 8 bits when you promised 32. Try instead a valid 32-bit number in the array, such as new byte[] { 0x32, 0, 0, 0 }.

If you want an arbitrary length array converted, you can implement this yourself:

ulong ConvertLittleEndian(byte[] array)
{
    int pos = 0;
    ulong result = 0;
    foreach (byte by in array) {
        result |= ((ulong)by) << pos;
        pos += 8;
    }
    return result;
}

It's not clear what the second part of your question (involving strings) is supposed to produce, but I guess you want hex digits? BitConverter can help with that too, as described in an earlier question.

Best Answer

Related Solutions

C# – Converting int[] to byte[]

C# – Convert Byte Array to Int

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