密码屏蔽控制台应用程序

我尝试了下面的代码…

string pass = "";
Console.Write("Enter your password: ");
ConsoleKeyInfo key;

do
{
    key = Console.ReadKey(true);

    // Backspace Should Not Work
    if (key.Key != ConsoleKey.Backspace)
    {
        pass += key.KeyChar;
        Console.Write("*");
    }
    else
    {
        Console.Write("\b");
    }
}
// Stops Receving Keys Once Enter is Pressed
while (key.Key != ConsoleKey.Enter);

Console.WriteLine();
Console.WriteLine("The Password You entered is : " + pass);

但是这样的话，退格键在输入密码时就不起作用了。任何建议吗?

当前回答

控制台。写(“b \ b \”);将从屏幕上删除星号字符，但在else块中没有任何代码可以从传递字符串变量中删除先前输入的字符。

这里是相关的工作代码，应该做你需要的:

var pass = string.Empty;
ConsoleKey key;
do
{
    var keyInfo = Console.ReadKey(intercept: true);
    key = keyInfo.Key;

    if (key == ConsoleKey.Backspace && pass.Length > 0)
    {
        Console.Write("\b \b");
        pass = pass[0..^1];
    }
    else if (!char.IsControl(keyInfo.KeyChar))
    {
        Console.Write("*");
        pass += keyInfo.KeyChar;
    }
} while (key != ConsoleKey.Enter);

2010-08-04 10:13:43

其他回答

采取顶部的答案，以及从其评论的建议，并将其修改为使用SecureString而不是String，测试所有控制键，而不是错误或在密码长度为0时向屏幕写入额外的“*”，我的解决方案是:

public static SecureString getPasswordFromConsole(String displayMessage) {
    SecureString pass = new SecureString();
    Console.Write(displayMessage);
    ConsoleKeyInfo key;

    do {
        key = Console.ReadKey(true);

        // Backspace Should Not Work
        if (!char.IsControl(key.KeyChar)) {
            pass.AppendChar(key.KeyChar);
            Console.Write("*");
        } else {
            if (key.Key == ConsoleKey.Backspace && pass.Length > 0) {
                pass.RemoveAt(pass.Length - 1);
                Console.Write("\b \b");
            }
        }
    }
    // Stops Receving Keys Once Enter is Pressed
    while (key.Key != ConsoleKey.Enter);
    return pass;
}

2016-11-29 15:24:36

控制台。写(“b \ b \”);将从屏幕上删除星号字符，但在else块中没有任何代码可以从传递字符串变量中删除先前输入的字符。

这里是相关的工作代码，应该做你需要的:

var pass = string.Empty;
ConsoleKey key;
do
{
    var keyInfo = Console.ReadKey(intercept: true);
    key = keyInfo.Key;

    if (key == ConsoleKey.Backspace && pass.Length > 0)
    {
        Console.Write("\b \b");
        pass = pass[0..^1];
    }
    else if (!char.IsControl(keyInfo.KeyChar))
    {
        Console.Write("*");
        pass += keyInfo.KeyChar;
    }
} while (key != ConsoleKey.Enter);

2010-08-04 10:13:43

在花了太多时间试图输入密码后，我更新了罗尼的版本，却发现我有我的CAPS LOCK !

在这个版本中，无论_CapsLockMessage中的消息是什么，都将“浮动”在输入区域的末尾，并将显示为红色。

这个版本需要更多的代码，并且需要轮询循环。在我的计算机上，CPU使用率约为3%至4%，但如果需要，总是可以添加一个小的Sleep()值来降低CPU使用率。

    private const string _CapsLockMessage = " CAPS LOCK";

    /// <summary>
    /// Like System.Console.ReadLine(), only with a mask.
    /// </summary>
    /// <param name="mask">a <c>char</c> representing your choice of console mask</param>
    /// <returns>the string the user typed in</returns>
    public static string ReadLineMasked(char mask = '*')
    {
        // Taken from http://stackoverflow.com/a/19770778/486660
        var consoleLine = new StringBuilder();
        ConsoleKeyInfo keyInfo;
        bool isDone;
        bool isAlreadyLocked;
        bool isCapsLockOn;
        int cursorLeft;
        int cursorTop;
        ConsoleColor originalForegroundColor;

        isDone = false;
        isAlreadyLocked = Console.CapsLock;

        while (isDone == false)
        {
            isCapsLockOn = Console.CapsLock;
            if (isCapsLockOn != isAlreadyLocked)
            {
                if (isCapsLockOn)
                {
                    cursorLeft = Console.CursorLeft;
                    cursorTop = Console.CursorTop;
                    originalForegroundColor = Console.ForegroundColor;
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.Write("{0}", _CapsLockMessage);
                    Console.SetCursorPosition(cursorLeft, cursorTop);
                    Console.ForegroundColor = originalForegroundColor;
                }
                else
                {
                    cursorLeft = Console.CursorLeft;
                    cursorTop = Console.CursorTop;
                    Console.Write("{0}", string.Empty.PadRight(_CapsLockMessage.Length));
                    Console.SetCursorPosition(cursorLeft, cursorTop);
                }
                isAlreadyLocked = isCapsLockOn;
            }

            if (Console.KeyAvailable)
            {
                keyInfo = Console.ReadKey(intercept: true);

                if (keyInfo.Key == ConsoleKey.Enter)
                {
                    isDone = true;
                    continue;
                }

                if (!char.IsControl(keyInfo.KeyChar))
                {
                    consoleLine.Append(keyInfo.KeyChar);
                    Console.Write(mask);
                }
                else if (keyInfo.Key == ConsoleKey.Backspace && consoleLine.Length > 0)
                {
                    consoleLine.Remove(consoleLine.Length - 1, 1);

                    if (Console.CursorLeft == 0)
                    {
                        Console.SetCursorPosition(Console.BufferWidth - 1, Console.CursorTop - 1);
                        Console.Write(' ');
                        Console.SetCursorPosition(Console.BufferWidth - 1, Console.CursorTop - 1);
                    }
                    else
                    {
                        Console.Write("\b \b");
                    }
                }

                if (isCapsLockOn)
                {
                    cursorLeft = Console.CursorLeft;
                    cursorTop = Console.CursorTop;
                    originalForegroundColor = Console.ForegroundColor;
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.Write("{0}", _CapsLockMessage);
                    Console.CursorLeft = cursorLeft;
                    Console.CursorTop = cursorTop;
                    Console.ForegroundColor = originalForegroundColor;
                }
            }
        }

        Console.WriteLine();

        return consoleLine.ToString();
    }

2015-07-27 18:04:36

呀的家伙

    static string ReadPasswordLine()
    {
        string pass = "";
        ConsoleKeyInfo key;
        do
        {
            key = Console.ReadKey(true);
            if (key.Key != ConsoleKey.Enter)
            {
                if (!(key.KeyChar < ' '))
                {
                    pass += key.KeyChar;
                    Console.Write("*");
                }
                else if (key.Key == ConsoleKey.Backspace && pass.Length > 0)
                {
                    Console.Write(Convert.ToChar(ConsoleKey.Backspace));
                    pass = pass.Remove(pass.Length - 1);
                    Console.Write(" ");
                    Console.Write(Convert.ToChar(ConsoleKey.Backspace));
                }
            }
        } while (key.Key != ConsoleKey.Enter);
        return pass;
    }

2020-09-12 05:07:18

下面是我的简单版本。每次你按下一个键，从控制台删除所有，并绘制尽可能多的'*'作为密码字符串的长度。

int chr = 0;
string pass = "";
const int ENTER = 13;
const int BS = 8;

do
{
   chr = Console.ReadKey().KeyChar;
   Console.Clear(); //imediately clear the char you printed

   //if the char is not 'return' or 'backspace' add it to pass string
   if (chr != ENTER && chr != BS) pass += (char)chr;

   //if you hit backspace remove last char from pass string
   if (chr == BS) pass = pass.Remove(pass.Length-1, 1);

   for (int i = 0; i < pass.Length; i++)
   {
      Console.Write('*');
   }
} 
 while (chr != ENTER);

Console.Write("\n");
Console.Write(pass);

Console.Read(); //just to see the pass

2018-04-18 08:24:29

密码屏蔽控制台应用程序

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