c# - Find first free element -

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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.


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