using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        List<string> fruits = new() { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10" };

        var e = fruits.GetEnumerator();

        // For some reason generic type inference won't work here

        var firstThree = e.Take<string, List<string>.Enumerator>(3);

        var nextThree = e.Take<string, List<string>.Enumerator>(3);

        // prints 1, 2, 3

        foreach (var x in firstThree)

            Console.WriteLine(x);

​

        // prints 4, 5, 6

        foreach (var x in nextThree)

            Console.WriteLine(x);

    }

}

​

public static class Extensions

{

    public static List<T> Take<T, TEnum>(ref this TEnum e, int num) where TEnum : struct, IEnumerator<T>

    {

        List<T> list = new List<T>(num);

        int taken = 0;

        while (taken < num && e.MoveNext())

        {

            list.Add(e.Current);

            taken++;

        }

​

        return list;

    }

}

​