LINQ, simplifying expression - take while sum of taken does not exceed given value

Question

Given a setup like this ..

class Product {
   int Cost;
   // other properties unimportant
}

var products = new List {
    new Product { Cost         


        

Answer 1

Use a captured variable to track the amount taken so far.

int sum = 0;

IEnumerable query = products.TakeWhile(p =>
{
  bool canAfford = (sum + p.Cost) <= credit;
  sum = canAfford ? sum + p.Cost : sum;
  return canAfford;
});