check that int array contains !=0 value using lambda

Question

hey, I have two-dimension array

 List<List<int>> boardArray

How can I enumerate throw this array to check that it contains other value than 0 ? I think about boardArray.Contains and ForEach ,cause it return bool value but I don't have too much experience with lambda expression :/ Please help :)

Answer 1

if (!boardArray.SelectMany(list => list).All(i => i == 0)) {
  ...
}

SelectMany flattens the List<List<int>> into one sequence of ints, whereas All checks that every element matches a condition.

Answer 2

Do you want to check the inner lists or simply the entire thing for a non-zero?

boardArray.Any(list => list.Any(item => item != 0));
boardArray.Where(list => list.Any(item => item != 0));

The first line will return true/false indicating whether or not there is any list within the outer list that has a non-zero value. The second line, on the other hand, filters for the lists containing non-zero items.

Answer 3

bool containsZero = (!boardArray.SelectMany(list => list).Any(i => i == 0))

This says From all the items in boardarray loop through all of the items inside of that and return faslse if one isn't zero, then we are inversing that false.