Question

I’ve looked all over but can’t figure this out. How do you sum a list of BigIntegers?

Using System.Numerics;
Using System.Linq;

List<BigInteger> bigInts = new List<BigInteger>();
BigInteger sum = bigInts.Sum();             // doesn't work
BigInteger sum = bigInts.Sum<BigInteger>(); // doesn't work
BigInteger sum = bigInts.Sum(x => x);       // doesn't work

Do you have to do this?

BigInteger sum = new BigInteger(0);
foreach(BigInteger bigint in bigInts)
    sum += bigint;

Answer 1

Aggregate function is more general version of Sum:

var bigInts = new List<System.Numerics.BigInteger>(); 
bigInts.Add(new System.Numerics.BigInteger(1));

var result = bigInts.Aggregate((currentSum, item)=> currentSum + item));