csharp Console.ReadPassword.cs

Posted 2021-05-12

[System.Diagnostics.DebuggerStepThrough]
public static string ReadPassword(char maskChar = '*')
{
    var password = string.Empty;
    var categories = new[] { UnicodeCategory.Control, UnicodeCategory.Format, UnicodeCategory.OtherNotAssigned, UnicodeCategory.PrivateUse, UnicodeCategory.Surrogate };
    for (var key = Console.ReadKey(true); key.Key != ConsoleKey.Enter; key = Console.ReadKey(true))
    {
        if (!categories.Contains(char.GetUnicodeCategory(key.KeyChar)))
        {
            password = string.Concat(password, key.KeyChar);
            Console.Write(maskChar);
        }
        else if (key.Key == ConsoleKey.Backspace && password.Length > 0)
        {
            password = password.Remove(password.Length - 1);
            //Console.Write("{0} {0}", key.KeyChar); // does not handle row breaks
            #region Console.Backspace();
            var left = Console.CursorLeft - 1;
            var top = Console.CursorTop;
            if (left < 0)
            {
                left = Console.BufferWidth - 1;
                top = top - 1;
            }
            Console.SetCursorPosition(left, top);
            Console.WriteLine(" ");
            Console.SetCursorPosition(left, top);
            #endregion
        }
    }
    Console.WriteLine();
    return password;
}