c# - 字符串或列表的键输入/删除字符串的最后一个字符

Question

基本上，我正在创建一个基本的密码脚本。

我目前遇到的问题是注册退格键以删除字符。我有检测退格键的基础，但它们实际上还没有做任何事情，因为我目前将输入用作字符串，而据我所知，字符串不能使用简单的修改来删除最后一个字符？

由此导致的第二个问题是，当执行退格键时，替换真实字符的控制台“*”字符不会从控制台中删除。有没有办法修改控制台显示以将其删除？

另一方面，如果有一种方法可以从字符串中删除单个字符，这将有助于了解此程序和将来的其他程序。

所以在这种情况下，将输入的字符插入到列表中是否对我来说是理想的，如果实施退格键以删除最后一个索引列表元素？

代码如下：

using System;
using System.Collections.Generic;

namespace MobileApplication
{
    public class Password
    {
        public void run()
        {
            while (true)
            {
                String b = "\n---------\n";
                String Pass = "TS";
                String passin = "";
                int count = 1;
                int limit = 4;

                Console.Write($"{b}- Login -{b}\n(Case senitive)");
                Console.Write($"\nPassword > ");
                while ( count <= limit) {
                    var key = System.Console.ReadKey(true);

                    //if (key.Key != ConsoleKey.Enter) {              // the below can be substituted for this but then backspage shows up as *

                    if (key.Key == ConsoleKey.A || key.Key == ConsoleKey.B || key.Key == ConsoleKey.C || key.Key == ConsoleKey.D ||
                        key.Key == ConsoleKey.E || key.Key == ConsoleKey.F || key.Key == ConsoleKey.G || key.Key == ConsoleKey.H ||
                        key.Key == ConsoleKey.I || key.Key == ConsoleKey.J || key.Key == ConsoleKey.K || key.Key == ConsoleKey.L ||
                        key.Key == ConsoleKey.M || key.Key == ConsoleKey.N || key.Key == ConsoleKey.O || key.Key == ConsoleKey.P||
                        key.Key == ConsoleKey.Q || key.Key == ConsoleKey.R || key.Key == ConsoleKey.S || key.Key == ConsoleKey.T ||
                        key.Key == ConsoleKey.U || key.Key == ConsoleKey.V || key.Key == ConsoleKey.W || key.Key == ConsoleKey.X ||
                        key.Key == ConsoleKey.Y || key.Key == ConsoleKey.Z)
                    {

                        passin += key.KeyChar;
                        Console.Write("*");
                    }
                   //  else if (key.Key == ConsoleKey.Backspace)    // this is the problem
                    // {
                   //     String temppass = passin;
                  //      passin -= key.KeyChar;
                   //  }
                    else if (key.Key == ConsoleKey.Enter)
                    {
                        Console.WriteLine($"\n{passin} ENTER");
                        //break;
                        if (passin == Pass)
                        {
                            Console.WriteLine("success haxer");
                        }
                        else
                        {
                            passin = "";
                            Console.Write($"incorrect password ({count} / {limit})\n\nPassword > ");
                            count++;
                        }

                    }
                }
                Console.Write($"U Failed 2 haxing");
                Console.Write($"{b}\n- Goodbye -\n{b}");
            }
        }
    }
}

Answer 1

您需要从屏幕上删除“*” - Console.Write("\b \b") 应该可以处理。然后从字符串中删除字符，你可以只使用从字符串中删除的函数。所以代码应该是这样的：

else if (key.Key == ConsoleKey.Backspace)    // this is the problem
{
    Console.Write("\b \b");
    passin = passin.Remove(passin.Length - 1, 1);
}

c# - 字符串或列表的键输入/删除字符串的最后一个字符

c# - key input to string or list / deleting last character of string

c#

passwords

console