Conversion double array to byte array

Question

How do I convert a double[] array to a byte[] array and vice versa?

class Program
{
    static void Main(string[] args)
    {
              


        

Answer 1

You can use the Select and ToArray methods to convert one array to another:

oneArray = anotherArray.Select(n => {
  // the conversion of one item from one type to another goes here
}).ToArray();

To convert from double to byte:

byteArray = doubleArray.Select(n => {
  return Convert.ToByte(n);
}).ToArray();

To convert from byte to double you just change the conversion part:

doubleArray = byteArray.Select(n => {
  return Convert.ToDouble(n);
}).ToArray();

---

If you want to convert each double to a multi-byte representation, you can use the SelectMany method and the BitConverter class. As each double will result in an array of bytes, the SelectMany method will flatten them into a single result.

byteArray = doubleArray.SelectMany(n => {
  return BitConverter.GetBytes(n);
}).ToArray();

To convert back to doubles, you would need to loop the bytes eight at a time:

doubleArray = Enumerable.Range(0, byteArray.Length / 8).Select(i => {
  return BitConverter.ToDouble(byteArray, i * 8);
}).ToArray();