Convert int[] to byte[]?

byte[] bytes = intArray.SelectMany(BitConverter.GetBytes).ToArray()

byte[][] bytes = intArray.Select(x => BitConverter.GetBytes(x)).ToArray();

using System.Runtime.InteropServices;

int[] foo = { 1, 2, 3, 4, 5 };
byte[] bar = MemoryMarshal.AsBytes<int>(foo).ToArray();

bar

using System.Runtime.InteropServices;

int[] foo = { 1, 2, 3, 4, 5 };
byte[] bar = MemoryMarshal.AsBytes<int>(foo).ToArray();

string.Join("", bar)

Span<byte> bytes = MemoryMarshal.Cast<int, byte>(foo);

AQAAAAIAAAADAAAABAAAAAUAAAA=

10002000300040005000