Tuesday, March 20, 2012

Password in C# Console Application

Today my friend ask me how to make password field in C# Console Application.
I found the simple solution:
class PasswordExample
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Pls key in your Login ID");
            var loginid = Console.ReadLine();
            Console.WriteLine("Pls key in your Password");
            var password = ReadPassword();
            Console.Write("Your Password is:" + password);
            Console.ReadLine();
        }

      
     public static string ReadPassword()
        {
            string password = "";
            ConsoleKeyInfo info = Console.ReadKey(true);
            while (info.Key != ConsoleKey.Enter)
            {
                if (info.Key != ConsoleKey.Backspace)
                {
                    Console.Write("*");
                    password += info.KeyChar;
                }
                else if (info.Key == ConsoleKey.Backspace)
                {
                    if (!string.IsNullOrEmpty(password))
                    {
                        // remove one character from the list of password characters
                        password = password.Substring(0, password.Length - 1);
                        // get the location of the cursor
                        int pos = Console.CursorLeft;
                        // move the cursor to the left by one character
                        Console.SetCursorPosition(pos - 1, Console.CursorTop);
                        // replace it with space
                        Console.Write(" ");
                        // move the cursor to the left by one character again
                        Console.SetCursorPosition(pos - 1, Console.CursorTop);
                    }
                }
                info = Console.ReadKey(true);
            }
            // add a new line because user pressed enter at the end of their password
            Console.WriteLine();
            return password;
        }
    }

That's it.

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