2.6

using System;
using System.Collections.Generic;

namespace ConsoleApp27
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> numbers = new List<int>();
            string userInput;
            bool isWorking = true;
            int number;
            int positive;

            while (isWorking)
            {
                Console.Write("Введите число: ");
                userInput = Console.ReadLine();

                if (userInput == "0")
                {
                    isWorking = false;

                    break;
                }
                else
                {
                    if (int.TryParse(userInput,out number))
                        numbers.Add(number);
                    else
                        Console.WriteLine("Вводите только числа!");
                }
            }
            ShowCollection(numbers);
            PosNegSeq(numbers, out positive);
            Console.WriteLine($"Кол-во положительных: {positive}\n" +
                $"Кол-во отрицательных: {numbers.Count - positive}");
        }

        private static void ShowCollection<T>(List<T> collection)
        {
            foreach (T item in collection)
                Console.Write($"{item} ");
        }

        private static void PosNegSeq(List<int> numbers, out int positive)
        {
            positive = 0;

            foreach (int number in numbers)
                if (number > 0)
                    positive += 1;
        }
    }
}