Console.ReadKey();和 Switch 语句 - 使用字母 [英] Console.ReadKey(); and Switch statement - using letters

问题描述

我正在尝试使用 Console.ReadKey(); 在 C# 中制作一个程序，该程序基本上基于用户按下的键(例如 X = Quit、D = Disconnect 等；)运行.在 C# 中

I'm trying to make a program in C# that basically functions based on the key a user presses (ex. X = Quit, D = Disconnect, etc;) by using Console.ReadKey(); in c#

我遇到的问题是如何在 Switch 语句中使用 ReadKey 信息.有人可以帮忙吗?代码如下.

The problem I'm running into is how to use the ReadKey info in a Switch statement.. Can someone help please? The code is below.

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

namespace Switch_Test
{
    class Program
    {
        static void Main()
        {
            Console.WriteLine("Welcome. Please enter your command: ");
            string chinput;
            int input;
            bool activated = false;
            input = Console.ReadKey();
            chinput = Convert.ToChar(input);
            switch (chinput)
            {
                case 'x':
                    {
                        Console.WriteLine("You pressed x...");
                        break;
                    }
                case 'y':
                    {
                        Console.WriteLine("You pressed y..");
                        break;
                    }
                case 'd':
                    {
                        if (activated != true)
                        {
                            Console.WriteLine("Please activate first!");
                            break;
                        }
                        else
                        {
                            Console.WriteLine("Active..");
                            break;
                        }
                    }
                case 'a':
                    {
                        if (activated != true)
                        {
                            activated = true;
                            Console.WriteLine("Activating..");
                            break;
                        }
                        else
                        {
                            activated = false;
                            Console.WriteLine("Deactivating.");
                            break;
                        }
                    }
                default:
                    Console.WriteLine("Unknown Command.");
                    break;
            }


        }
    }
}

我知道这可能真的错了，但我最初是从 Console.ReadLine(); 开始的.，唯一的区别是我希望它在您按下单个键时激活一个功能，而不必按 Enter 键或能够输入不同的键.提前致谢！

I know that's probably really wrong but I originally started with Console.ReadLine(); , the only difference is I want it to activate a function when you press a single key rather than having to hit enter or being able to type in different keys. Thanks in advance!

推荐答案

首先，Convert.ToChar() 对 ConsoleKeyInfo 结构不起作用，所以为什么你有问题，这个转换会抛出一个异常.

First of all, Convert.ToChar() doesn't work on ConsoleKeyInfo structure, so that's why you have problems, this conversion will throw an Exception.

您不必将键转换为字符，相反，您可以打开 .Key 属性，该属性是包含每个键的可枚举:

You don't have to convert your key to character, instead, you can switch on .Key property, which is an enumerable that contains every key:

var input = Console.ReadKey();

switch (input.Key) //Switch on Key enum
{
    case ConsoleKey.X:
        break;
    case ConsoleKey.Y:
        break;
}

1. 您也可以使用 input.KeyChar 来获取您首先尝试的内容 - 字符，然后您可以根据需要打开它，但是很难打开不同的键，例如箭头等.
2. 如果你关心字母是大写还是小写，你可以使用 .KeyChar 或使用 .Key 和 .Modifiers 来检查是否移位用户键入字母时按下了键

1. You can also use input.KeyChar to get what you tried first - character, then you can switch on it if you want to, but it's harded to switch on different keys like arrows etc.
2. If you care if letter is capital/small, you can use .KeyChar or use .Key with .Modifiers to check if shift key was pressed when user typed the letter

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