ArrayList => n[x] n[x]=>ArrayList 会合转数组 数组转集合

ArrayList => n[x] n[x]=>ArrayList 集合转数组 数组转集合

ArrayList => n[x] n[x]=>ArrayList 集合转数组 数组转集合

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int[] a = { 1, 2, 3, 4, 5 };
ArrayList list = new ArrayList(a);
int[] b = list.ToArray(typeof(System.Int32)) as int[];