ReadConsole.cs

using System;

namespace ReadConsole
{
    class Program
    {
        public static void Print1DArrayOfNumbers(int[] arr)
        {
            foreach (int el in arr)
            {
                Console.Write($"{el} ");
            }
            Console.WriteLine();
        }

        public static string[] SplitBySpace(string text) {
            string[] temp = new string[text.Length];
            string value = "";
            int count = 0;
            for (int i = 0; i < text.Length; i++)
            {
                if (text[i] != 32)
                {
                    value += text[i];
          
                }
                if (text[i] == 32 && value != "" || i == text.Length -1)
                {
                    count++;
                    temp[i] = value;
                    value = "";
                }
            }
            string[] result = new string[count];
            count = 0;
            for (int j = 0; j < temp.Length; j++) {
                if (temp[j] != null) {
                    result[count] = temp[j];
                    count++;
                }
            }
            return result;
        }

        static void Main(string[] args)
        {

            string result = "";
            while (true)
            {
                string userInput = Console.ReadLine();
                if (userInput == "")
                {
                    Console.WriteLine("Done.");
                    break;
                }
                result += " " + userInput;
            }
            string[] splitInput = SplitBySpace(result);

            int[] convertedInput = new int[splitInput.Length];
            for (int i = 0; i < splitInput.Length; i++)
            {
                convertedInput[i] = Convert.ToInt32(splitInput[i]);

            }   
            Console.WriteLine("Your input:");
            Print1DArrayOfNumbers(convertedInput);
        }
    }
}