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 :)
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.
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.
SelectMany, however Anthony's use of Any and checking for non-zero is superior to using All and checking for zero. Any will stop looping as soon as it finds a value other than zero, while All will keep going even after it has enough information to answer the question, "Is there a non-zero value?"
All will stop as soon as it find a value that is not zero. So All() is the same as !Any() and Any() is the same at !All(). Reflector both if you want to see it by yourself.
All(i => i==0) will return false as soon as it finds any non-zero value, at the same place as Any(i => i!=0) would return true. The only extra cost here is the single extra negation, which is hardly worth considering.All and thinking of a Where/Count situation.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.
