Conversion double array to byte array

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Assuming you want the doubles placed in the corresponding byte array one after the other, LINQ can make short work out of this:

static byte[] GetBytes(double[] values)
{
    return values.SelectMany(value => BitConverter.GetBytes(value)).ToArray();
}

Alternatively, you could use Buffer.BlockCopy():

static byte[] GetBytesAlt(double[] values)
{
    var result = new byte[values.Length * sizeof(double)];
    Buffer.BlockCopy(values, 0, result, 0, result.Length);
    return result;
}

To convert back:

static double[] GetDoubles(byte[] bytes)
{
    return Enumerable.Range(0, bytes.Length / sizeof(double))
        .Select(offset => BitConverter.ToDouble(bytes, offset * sizeof(double)))
        .ToArray();
}

static double[] GetDoublesAlt(byte[] bytes)
{
    var result = new double[bytes.Length / sizeof(double)];
    Buffer.BlockCopy(bytes, 0, result, 0, bytes.Length);
    return result;
}

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