c#中用上下左右键控制在控制台界面任意位置显示“Hello World”

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Q713664
{
    class Program
    {
        static void Main(string[] args)
        {
            int x = 10;
            int y = 10;
            string s = "Hello World!(press enter to exit)";
            while (true)
            {
                Console.Clear();
                for (int i = 0; i < y; i++)
                    Console.WriteLine();
                for (int i = 0; i < x; i++)
                    Console.Write(" ");
                if (x >= 0)
                    Console.WriteLine(s);
                else if (x > 0 - s.Length)
                    Console.WriteLine(s.Substring(0 - x));
                else
                    x = 0 - s.Length;
                ConsoleKeyInfo ch = Console.ReadKey();
                if (x > 80) x = 80;
                if (ch.Key == ConsoleKey.UpArrow) y--;
                if (ch.Key == ConsoleKey.DownArrow) y++;
                if (ch.Key == ConsoleKey.LeftArrow) x--;
                if (ch.Key == ConsoleKey.RightArrow) x++;
                if (ch.Key == ConsoleKey.Enter) break;
            }
        }
    }
}

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