给List编个号

 int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };int i = 0;var q = (from n in numbersselect (index:++i,number:n)).ToList();foreach (var v in q)
{Console.WriteLine($"i = {v.index}, v = {v.number}");
}