密码屏蔽控制台应用程序

为此，您应该使用System.Security.SecureString

public SecureString GetPassword()
{
var pwd = new SecureString();
while (true)
{
ConsoleKeyInfo i = Console.ReadKey(true);
if (i.Key == ConsoleKey.Enter)
{
break;
}
else if (i.Key == ConsoleKey.Backspace)
{
if (pwd.Length > 0)
{
pwd.RemoveAt(pwd.Length - 1);
Console.Write("\b \b");
}
}
else if (i.KeyChar != '\u0000' ) // KeyChar == '\u0000' if the key pressed does not correspond to a printable character, e.g. F1, Pause-Break, etc
{
pwd.AppendChar(i.KeyChar);
Console.Write("*");
}
}
return pwd;
}

您可以将键附加到一个累加链表中。

当接收到退格键时，从列表中删除最后一个键。

当您接收到enter键时，将列表折叠成字符串并执行其余工作。

如果我理解正确，你试图使退格删除屏幕上可见的*字符和缓存字符在你的传递变量?

如果是这样，那么只需将你的else块更改为:

            else
{
Console.Write("\b");
pass = pass.Remove(pass.Length -1);
}

Console.Write("\b \b");将从屏幕上删除星号字符，但是在你的else块中没有任何代码可以从你的pass字符串变量中删除之前输入的字符。

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);

完整的解决方案，香草c# .net 3.5+

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


namespace ConsoleReadPasswords
{
class Program
{
static void Main(string[] args)
{
Console.Write("Password:");


string password = Orb.App.Console.ReadPassword();


Console.WriteLine("Sorry - I just can't keep a secret!");
Console.WriteLine("Your password was:\n<Password>{0}</Password>", password);


Console.ReadLine();
}
}
}


namespace Orb.App
{
/// <summary>
/// Adds some nice help to the console. Static extension methods don't exist (probably for a good reason) so the next best thing is congruent naming.
/// </summary>
static public class Console
{
/// <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 ReadPassword(char mask)
{
const int ENTER = 13, BACKSP = 8, CTRLBACKSP = 127;
int[] FILTERED = { 0, 27, 9, 10 /*, 32 space, if you care */ }; // const


var pass = new Stack<char>();
char chr = (char)0;


while ((chr = System.Console.ReadKey(true).KeyChar) != ENTER)
{
if (chr == BACKSP)
{
if (pass.Count > 0)
{
System.Console.Write("\b \b");
pass.Pop();
}
}
else if (chr == CTRLBACKSP)
{
while (pass.Count > 0)
{
System.Console.Write("\b \b");
pass.Pop();
}
}
else if (FILTERED.Count(x => chr == x) > 0) { }
else
{
pass.Push((char)chr);
System.Console.Write(mask);
}
}


System.Console.WriteLine();


return new string(pass.Reverse().ToArray());
}


/// <summary>
/// Like System.Console.ReadLine(), only with a mask.
/// </summary>
/// <returns>the string the user typed in </returns>
public static string ReadPassword()
{
return Orb.App.Console.ReadPassword('*');
}
}
}

我对退格做了一些修改

        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
{
pass = pass.Remove(pass.Length - 1);
Console.Write("\b \b");
}
}
// Stops Receving Keys Once Enter is Pressed
while (key.Key != ConsoleKey.Enter);


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

我的忽略控制字符和处理行换行:

public static string ReadLineMasked(char mask = '*')
{
var sb = new StringBuilder();
ConsoleKeyInfo keyInfo;
while ((keyInfo = Console.ReadKey(true)).Key != ConsoleKey.Enter)
{
if (!char.IsControl(keyInfo.KeyChar))
{
sb.Append(keyInfo.KeyChar);
Console.Write(mask);
}
else if (keyInfo.Key == ConsoleKey.Backspace && sb.Length > 0)
{
sb.Remove(sb.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");
}
}
Console.WriteLine();
return sb.ToString();
}

我已经更新了罗尼的版本，在花太多时间了试图输入密码后，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();
}

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


do {
key = Console.ReadKey(true);


if (key.Key != ConsoleKey.Backspace) {
pass += key.KeyChar;
Console.Write("*");
} else {
Console.Write("\b \b");
char[] pas = pass.ToCharArray();
string temp = "";
for (int i = 0; i < pass.Length - 1; i++) {
temp += pas[i];
}
pass = temp;
}
}
// Stops Receving Keys Once Enter is Pressed
while (key.Key != ConsoleKey.Enter);


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

我在shermy的香草c# 3.5 . net解决方案中发现了一个bug，否则它会很有魅力。我还结合了Damian leszczyzynski - Vash的SecureString思想，但如果你喜欢，你可以使用普通字符串。

错误:如果在密码提示期间按退格键，并且当前密码长度为0，则在密码掩码中错误地插入了星号。要修复此错误，请修改以下方法。

    public static string ReadPassword(char mask)
{
const int ENTER = 13, BACKSP = 8, CTRLBACKSP = 127;
int[] FILTERED = { 0, 27, 9, 10 /*, 32 space, if you care */ }; // const




SecureString securePass = new SecureString();


char chr = (char)0;


while ((chr = System.Console.ReadKey(true).KeyChar) != ENTER)
{
if (((chr == BACKSP) || (chr == CTRLBACKSP))
&& (securePass.Length > 0))
{
System.Console.Write("\b \b");
securePass.RemoveAt(securePass.Length - 1);


}
// Don't append * when length is 0 and backspace is selected
else if (((chr == BACKSP) || (chr == CTRLBACKSP)) && (securePass.Length == 0))
{
}


// Don't append when a filtered char is detected
else if (FILTERED.Count(x => chr == x) > 0)
{
}


// Append and write * mask
else
{
securePass.AppendChar(chr);
System.Console.Write(mask);
}
}


System.Console.WriteLine();
IntPtr ptr = new IntPtr();
ptr = Marshal.SecureStringToBSTR(securePass);
string plainPass = Marshal.PtrToStringBSTR(ptr);
Marshal.ZeroFreeBSTR(ptr);
return plainPass;
}

读取控制台输入是困难的，你需要处理特殊的键，如Ctrl, Alt，还有光标键和退格/删除。在一些键盘布局中，如瑞典，甚至需要Ctrl来输入直接存在于美国键盘上的键。我相信尝试使用“低级”Console.ReadKey(true)来处理这个问题是非常困难的，所以最简单和最健壮的方法是在输入密码时禁用“控制台输入回声”，使用一点WINAPI。

下面的例子是基于从std::cin读取密码问题的答案。

    private enum StdHandle
{
Input = -10,
Output = -11,
Error = -12,
}


private enum ConsoleMode
{
ENABLE_ECHO_INPUT = 4
}


[DllImport("kernel32.dll", SetLastError = true)]
private static extern IntPtr GetStdHandle(StdHandle nStdHandle);


[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool GetConsoleMode(IntPtr hConsoleHandle, out int lpMode);


[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool SetConsoleMode(IntPtr hConsoleHandle, int dwMode);


public static string ReadPassword()
{
IntPtr stdInputHandle = GetStdHandle(StdHandle.Input);
if (stdInputHandle == IntPtr.Zero)
{
throw new InvalidOperationException("No console input");
}


int previousConsoleMode;
if (!GetConsoleMode(stdInputHandle , out previousConsoleMode))
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "Could not get console mode.");
}


// disable console input echo
if (!SetConsoleMode(stdInputHandle , previousConsoleMode & ~(int)ConsoleMode.ENABLE_ECHO_INPUT))
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "Could not disable console input echo.");
}


// just read the password using standard Console.ReadLine()
string password = Console.ReadLine();


// reset console mode to previous
if (!SetConsoleMode(stdInputHandle , previousConsoleMode))
{
throw new Win32Exception(Marshal.GetLastWin32Error(), "Could not reset console mode.");
}


return password;
}

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;
}

这将用一个红色方块掩盖密码，然后在输入密码后恢复到原来的颜色。

它不会阻止用户使用复制/粘贴来获取密码，但如果它只是为了阻止别人从你的身后看，这是一个很好的快速解决方案。

Console.Write("Password ");
ConsoleColor origBG = Console.BackgroundColor; // Store original values
ConsoleColor origFG = Console.ForegroundColor;


Console.BackgroundColor = ConsoleColor.Red; // Set the block colour (could be anything)
Console.ForegroundColor = ConsoleColor.Red;


string Password = Console.ReadLine(); // read the password


Console.BackgroundColor= origBG; // revert back to original
Console.ForegroundColor= origFG;

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

下面是一个版本，增加了对Escape键的支持(它返回一个null字符串)

public static string ReadPassword()
{
string password = "";
while (true)
{
ConsoleKeyInfo key = Console.ReadKey(true);
switch (key.Key)
{
case ConsoleKey.Escape:
return null;
case ConsoleKey.Enter:
return password;
case ConsoleKey.Backspace:
if (password.Length > 0)
{
password = password.Substring(0, (password.Length - 1));
Console.Write("\b \b");
}
break;
default:
password += key.KeyChar;
Console.Write("*");
break;
}
}
}

(My) nuget包来做这个，基于顶部的答案:

install-package PanoramicData.ConsoleExtensions

用法:

using PanoramicData.ConsoleExtensions;


...


Console.Write("Password: ");
var password = ConsolePlus.ReadPassword();
Console.WriteLine();

项目URL: https://github.com/panoramicdata/PanoramicData.ConsoleExtensions

欢迎拉请求。

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;
}