Foreach双倍或三倍

Question

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

namespace lotto
{
class Program
{

    static void Main(string[] args)
    {
        char k = 'l';
        while (!(k == 'k'))
        {
            Random rnd = new Random();
            int[] tablica = new int[6];
            for (int i = 0; i < 6; i++)
            {

                    tablica[i] = 0;

            }
                for (int i = 0, z; i < 6; i++)
                {
                   {
                    z = rnd.Next(1, 49);
                    while (tablica.Contains(z))
                    {
                        z = rnd.Next(1, 49);
                    }
                    tablica[i] = z;
                }
            }
            Array.Sort(tablica);
            foreach (int q in tablica)
            {
                Console.Write(q);
                Console.Write(", ");
            }
            k = Convert.ToChar(Console.Read()) ;
            Console.WriteLine("\n\n\n");
        }
    }


    }
 }

它工作正常.当我使用逐步点击(视觉工作室中的F10)时,它运行正常.但是,当我正常运行它,然后

k=Convert.ToChar(Console.Read());

当我提供'k'时,程序会按预期停止.当我什么都不提供的时候,就是这样

 foreach (int q in tablica)
        {
            Console.Write(q);
            Console.Write(", ");
        }
        k = Convert.ToChar(Console.Read()) ;
        Console.WriteLine("\n\n\n");

两次,当我提供"k"以外的任何东西时,它会做三次.搞什么鬼.

Answer 1

Console.Read reads a single character at a time from the input stream (doc). When you press enter you are supplying two characters: \r then \n, so there are two characters to read before pausing for further user input.

I'm confused how it ran fine when you used F10 as I did this to see what was looping, I just so happened to use Enter when supplying "nothing" and saw the characters pop through.