Select with index of item(分別取得"列表值" & "列表索引")

 //Select with index of item(分別取得"列表值" & "列表索引")

        static void Select_With_Index_of_item()

        {

            int[] numbers = { 6, 4, 3, 9, 8, 5, 7, 2, 0 };

//var numsInPlace = numbers.Select((num, index) =>  (Num: num, InPlace: (num == index))); 

//元組tuple寫法,只有C#7可以用

var numsInPlace = numbers.Select((num, index) => new { Num = num, InPlace = (num == index) } ); 

//匿名anonymous寫法,C#6可以用

            foreach (var item in numsInPlace)

            {

                WriteLine($"{item.Num} : {item.InPlace}");

            }

        }