C#从列表返回int，并创建一个元组列表，其中包含每个int以及每个int在第一个列表中的索引

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };

        List<(int, int)> tupleList = GetIntsWithIndexes(numbers);

        foreach (var tuple in tupleList)
        {
            Console.WriteLine($"Number: {tuple.Item1}, Index: {tuple.Item2}");
        }
    }

    static List<(int, int)> GetIntsWithIndexes(List<int> numbers)
    {
        List<(int, int)> tupleList = new List<(int, int)>();

        for (int i = 0; i < numbers.Count; i++)
        {
            tupleList.Add((numbers[i], i));
        }

        return tupleList;
    }
}

Number: 1, Index: 0
Number: 2, Index: 1
Number: 3, Index: 2
Number: 4, Index: 3
Number: 5, Index: 4