c# - Find first free element -

i looking query return first number not available in list

int[] list = new int[] { 1,4,2,5,6,7 };

for above example expect have result 3.

perhaps this:

int result = enumerable.range(1, list.length)                        .where(i => !list.contains(i))                        .firstordefault();

this return 0 if list contains integers 1 n.

KBPS