input - easiest way to take file into an array?

i have file of integers. first number - number of subsequent numbers. easiest way take file array? c#

example 1: 8 1 2 3 4 5 6 7 8

example 2: 4 1 2 3 0

example 3: 3 0 0 1

int[] numbers = file     .readalltext("test.txt")     .split(' ')     .select(int.parse)     .skip(1)     .toarray();

or if have number per line:

int[] numbers = file     .readalllines("test.txt")     .select(int.parse)     .skip(1)     .toarray();

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