自分用に。
2次元配列を1次元配列に
int[,] array = { { 1, 2, }, { 3, 4 } };
var x = array.Cast<int>();
// {1, 2, 3, 4}
ジャグ配列を1次元配列に
int[][] array = { new int[]{ 1, 2, }, new int[] { 3, 4 } };
var x = array.SelectMany(x => x).ToArray();
// {1, 2, 3, 4}
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