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string[] ss = new string[] { "1", "2", "3" };
int[] i = ss.Select(x=>Convert.ToInt32(x)).ToArray();
string[] s = new string[] { "1", "2", "3" };
int[] i = (from num in s select int.Parse(num)).ToArray();
int[] i = s.Select(p => int.Parse(p)).ToArray();