控制台应用程序退出方法不起作用

Question

exit

方法在按 q 返回并出现异常句柄错误时不起作用。它是一个控制台应用程序，我应该同时使用 application.exit（） 和 envoirnment.exit（） 。两者都不起作用. 我做错了什么吗. 帮助将不胜感激。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace calculator_extended
{
    class Program
    {
        static void Main(string[] args)
        {
            int d = 0;
            while (true)
            {
                Console.WriteLine("Press A for addition");
                Console.WriteLine("Press S for subtraction");
                Console.WriteLine("Press M for Multiplication");
                Console.WriteLine("Press D for Divide");
                Console.WriteLine("Press q for Exit");

                char c = Convert.ToChar(Console.ReadLine());
                int a = Convert.ToInt32(Console.ReadLine());
                int b = Convert.ToInt32(Console.ReadLine());
                switch (c)
                {
                    case 'A':
                    case 'a':
                        {
                            d = add(a, b);
                            Console.WriteLine(d);
                            break;

                        }

                    case 'S':
                    case 's':
                        {
                            d = sub(a, b);
                            Console.WriteLine(d);
                            break;
                        }
                    case 'M':
                    case 'm':
                        {
                            d = mul(a, b);
                            Console.WriteLine(d);
                            break;
                        }
                    case 'D':
                    case 'd':
                        {
                            d = div(a, b);
                            Console.WriteLine(d);
                            break;
                        }
                    case 'q':
                        {
                            Environment.Exit(0);
                            break;
                        }
                    default:
                        {
                            Console.WriteLine("Please Enter the correct Character");
                            break;
                        }

                }
            }
        }
            private static int add(int a, int b)
    {
                   return a + b;
    }
               private static int sub(int a, int b)
    {
                   return a - b;
    }
               private static int mul(int a, int b)
    {
                   return a * b;
    }
               private static int div(int a, int b)
    {
                   return a / b;
    }

        }
    }

好的，这有效，谢谢大家的帮助，你能检查一下，让我知道代码是否完美，我没有遗漏什么。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace calculator_extended
{
    class Program
    {
        static void Main(string[] args)
        {
            int d = 0;
            while (true)
            {
                Console.WriteLine("Press A for addition");
                Console.WriteLine("Press S for subtraction");
                Console.WriteLine("Press M for Multiplication");
                Console.WriteLine("Press D for Divide");
                Console.WriteLine("Press q for Exit");

                char c = Convert.ToChar(Console.ReadLine());
                if (c == 'q')
                {
                    Environment.Exit(0);
                }
                int a = Convert.ToInt32(Console.ReadLine());
                int b = Convert.ToInt32(Console.ReadLine());
                switch (c)
                {
                    case 'A':
                    case 'a':
                        {
                            d = add(a, b);
                            Console.WriteLine(d);
                            break;

                        }

                    case 'S':
                    case 's':
                        {
                            d = sub(a, b);
                            Console.WriteLine(d);
                            break;
                        }
                    case 'M':
                    case 'm':
                        {
                            d = mul(a, b);
                            Console.WriteLine(d);
                            break;
                        }
                    case 'D':
                    case 'd':
                        {
                            d = div(a, b);
                            Console.WriteLine(d);
                            break;
                        }

                    default:
                        {
                            Console.WriteLine("Please Enter the correct Character");
                            break;
                        }

                }
            }
        }
            private static int add(int a, int b)
    {
                   return a + b;
    }
               private static int sub(int a, int b)
    {
                   return a - b;
    }
               private static int mul(int a, int b)
    {
                   return a * b;
    }
               private static int div(int a, int b)
    {
                   return a / b;
    }

        }
    }

Answer 1

也许是因为您的应用程序在按"q"后等待 2 个数字？

尝试更改代码，删除大小写"Q"并替换：

char c = Convert.ToChar(Console.ReadLine());

与以下内容：

char c = Convert.ToChar(Console.ReadLine());
if(c.ToLower() == 'q')
{
    Environment.Exit(0);
}

Answer 2

char c = Convert.ToChar(Console.ReadLine());
// you will need to Exit here if char is 'q'
// else it is expecting to read more entries below before it reaches your "case"
int a = Convert.ToInt32(Console.ReadLine());
int b = Convert.ToInt32(Console.ReadLine());

Answer 3

尝试Environment.Exit()这应该正常工作。

Answer 4

这段代码

char c = Convert.ToChar(Console.ReadLine()); 
int a = Convert.ToInt32(Console.ReadLine()); 
int b = Convert.ToInt32(Console.ReadLine()); 

从控制台读取 3 行。

你可能想要

char c = Convert.ToChar(Console.ReadLine()); 
if (c=='Q' or c=='q') return;
int a = Convert.ToInt32(Console.ReadLine()); 
int b = Convert.ToInt32(Console.ReadLine()); 

Answer 5

只需像这样更改代码即可

bool exitLoop = false;
while(exitLoop) {
    ...
    case 'q':
        {
             exitLoop = true;
             break;
        }
    ...
}