CODEWITHSUNDEEP
c#arraylistbiginteger
user3660340
user3660340

Reputation: 23

ArrayList of BigIntegers to array of bytes

Is it possible to convert an ArrayList of BigIntegers to a byte array? If so, how?

 _randomNumbers = new ArrayList(_size);

I tried these

foreach (BigInteger number in _randomNumbers)
{
    bytes = number.ToByteArray();
}

Upvotes: 2

Views: 816

Answers (1)

Tim Schmelter
Tim Schmelter

Reputation: 460098

I would use a List<BigInteger> in the first place. There's no need for an ArrayList anymore. Then you can use this LINQ query:

var bigIntegers = new List<System.Numerics.BigInteger>(); // fill...
byte[][] allByteArrays = bigIntegers.Select(bi => bi.ToByteArray()).ToArray();

Otherwise you need to cast every object in the ArrayList:

byte[][] allByteArrays = bigIntegersArrayList.Cast<BigInteger>()
    .Select(bi => bi.ToByteArray())
    .ToArray();

For the sake of completeness, the classic way without LINQ which can be more efficient:

byte[][] allByteArrays = new byte[bigIntegers.Count][];
for (int i = 0; i < allByteArrays.Length; i++)
    allByteArrays[i] = bigIntegers[i].ToByteArray();

Upvotes: 2

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