You can omit the seed value when calling Aggregate.
The first element becomes the implicit seed, and aggregation proceeds from the second element.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
class Program
{
static void Main()
{
int[] numbers = { 1, 2, 3 };
int x = numbers.Aggregate(0, (prod, n) => prod * n); // 0*1*2*3 = 0
int y = numbers.Aggregate((prod, n) => prod * n); // 1*2*3 = 6
Console.WriteLine(x);
Console.WriteLine(y);
}
}
The output:
0
6