如何在WPF密码框中显示字符数秒？

如果用户在密码框中输入1985，则四个项目符号(●●●●) 将显示。我如何显示在几秒钟内输入的每个字母或数字，然后将其更改为项目符号？我想这不能在密码框中完成，但有其他方法吗？

在密码框顶部放置一个文本框，然后使用一点数据绑定和动画。这段XAML将允许文本框o只要输入继续，文本框就会可见，但一旦输入停止，文本框就会消失，只留下显示密码字符的密码框

    <Window.Resources>
        <Storyboard x:Key="Storyboard1">
            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="textBox">
                <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
                <EasingDoubleKeyFrame KeyTime="0:0:0.6" Value="1"/>
                <EasingDoubleKeyFrame KeyTime="0:0:1.2" Value="0"/>
            </DoubleAnimationUsingKeyFrames>
        </Storyboard>
    </Window.Resources>
    <Window.Triggers>
        <EventTrigger RoutedEvent="TextBoxBase.TextChanged" SourceName="textBox">
            <StopStoryboard BeginStoryboardName="Storyboard1_BeginStoryboard"/>
            <BeginStoryboard x:Name="Storyboard1_BeginStoryboard" Storyboard="{StaticResource Storyboard1}"/>
        </EventTrigger>
    </Window.Triggers>




<PasswordBox x:Name="passwordBox"/>
<TextBox x:Name="textBox"
        Text="{Binding ElementName=passwordBox, Path=Password, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
         Opacity="100"/>

tbxPwd_PreviewTestInput方法用于检索用户键入的字符。tbxPwd_PreviewKeyDown方法用于检索退格键或要检测的任何其他控制字符键

此代码中没有延迟，因此它始终以明文显示密码字符串的最后一个字符。添加一些代码以及计时器应该很容易，以便在延迟一段时间后将最后一个字符更改为pwd字符

上面的代码还没有经过彻底调试，因此如果用户将整个密码退格以重新开始，可能会出现问题

---

提示：Alt+0149显示“bullet”密码字符。

这只需使用一个

文本框即可实现。请参阅下面的代码：

窗口的XAML代码：

    <Label x:Name="Pwd" Height="30" Width="70" HorizontalAlignment="Left" FontSize="14"
           Margin="10,10,0,0" VerticalAlignment="Top" Content="Password:"/>
    <TextBox x:Name="textBox" Width="130" Height="30" Margin="30,10,0,0" 
             VerticalAlignment="Top" MaxLength="12" FontSize="14"
             PreviewKeyDown="TextBox_PreviewKeyDown" 
             KeyDown="TextBox_KeyDown" />
    <CheckBox x:Name="ckhShowPassword" Height="30" 
              Content="Show password characters" 
              Margin="69,0,59,42" VerticalAlignment="Bottom" 
              Checked="ckhShowPassword_Checked" Unchecked="ckhShowPassword_UnChecked"/>
    <Label x:Name="lblActualPwd" Height="30" Width="200" 
           Margin="10,100,0,0" VerticalAlignment="Top" FontSize="14"
           HorizontalAlignment="Center" HorizontalContentAlignment="Center"/>



C#代码隐藏：

    #region "CLASS LEVEL VARIABLES"
    System.Windows.Threading.DispatcherTimer dispatcherTimer = 
        new System.Windows.Threading.DispatcherTimer();
    string actualPwd = "";
    #endregion

    #region "WINDOW EVENTS"
    public Window2()
    {
        InitializeComponent();
    }

    private void Window2_Loaded(object sender, RoutedEventArgs e)
    {
        lblActualPwd.Visibility = Visibility.Hidden;
        textBox.Focus();
    }
    #endregion

    #region "TEXTBOX EVENTS"
    private void TextBox_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key != Key.Back)
        {
            actualPwd += GetCharFromKey(e.Key); //Store actual characters for later retrieval        
        }
        else if (e.Key == Key.Back)
        {
            if (actualPwd.Length > 0)
                actualPwd = actualPwd.Remove(actualPwd.Length - 1);
            else
                actualPwd = "";
        }
        else
        {
            actualPwd += GetCharFromKey(e.Key);
        }

        string str = "";
        for (int i = 0; i < textBox.Text.Length; i++)
            str += char.ConvertFromUtf32(8226);

        textBox.Text = str;
        textBox.Select(textBox.Text.Length, 0);
    }

    private void TextBox_KeyDown(object sender, KeyEventArgs e)
    {
        dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
        dispatcherTimer.Interval = new TimeSpan(0, 0, 0, 1);
        dispatcherTimer.Start();
    }
    #endregion

    #region "DISPATCHER EVENT"
    private void dispatcherTimer_Tick(object sender, EventArgs e)
    {   
        string str = "";
        for(int i = 0; i < textBox.Text.Length; i++)
            str += char.ConvertFromUtf32(8226);

        textBox.Text = str;
        textBox.Select(textBox.Text.Length, 0);
    }
    #endregion

    #region "CHECKBOX EVENTS"
    private void ckhShowPassword_Checked(object sender, RoutedEventArgs e)
    {
        if (actualPwd.Length > 0)
        {
            lblActualPwd.Foreground = Brushes.Blue;
            lblActualPwd.Content = actualPwd;
            lblActualPwd.Visibility = Visibility.Visible;
        }
        else
        {
            lblActualPwd.Foreground = Brushes.Red;
            lblActualPwd.Content = "Please input password.";
            lblActualPwd.Visibility = Visibility.Visible;
        }
    }

    private void ckhShowPassword_UnChecked(object sender, RoutedEventArgs e)
    {
        lblActualPwd.Content = string.Empty;
        lblActualPwd.Visibility = Visibility.Hidden;
    }
    #endregion

    #region "ENUM TYPE - MAP KEY TO CHARACTER"
    public enum MapType : uint
    {
        MAPVK_VK_TO_VSC = 0x0,
        MAPVK_VSC_TO_VK = 0x1,
        MAPVK_VK_TO_CHAR = 0x2,
        MAPVK_VSC_TO_VK_EX = 0x3,
    }
    #endregion

    #region "INTEROP DLL IMPORT"
    [DllImport("user32.dll")]
    public static extern bool GetKeyboardState(byte[] lpKeyState);
    [DllImport("user32.dll")]
    public static extern uint MapVirtualKey(uint uCode, MapType uMapType);
    [DllImport("user32.dll")]
    #endregion

    #region "VIRTUAL KEY UNICODE CONVERSION"
    public static extern int ToUnicode(
     uint wVirtKey,
     uint wScanCode,
     byte[] lpKeyState,
     [Out, MarshalAs(UnmanagedType.LPWStr, SizeParamIndex = 4)] 
    StringBuilder pwszBuff,
     int cchBuff,
     uint wFlags);
    #endregion

    #region "FUNCTION - CHAR FROM KEY"
    public static char GetCharFromKey(Key key)
    {
        char ch = ' ';

        int virtualKey = KeyInterop.VirtualKeyFromKey(key);
        byte[] keyboardState = new byte[256];
        GetKeyboardState(keyboardState);

        uint scanCode = MapVirtualKey((uint)virtualKey, MapType.MAPVK_VK_TO_VSC);
        StringBuilder stringBuilder = new StringBuilder(2);

        int result = ToUnicode((uint)virtualKey, scanCode, keyboardState, stringBuilder, stringBuilder.Capacity, 0);
        switch (result)
        {
            case -1:
                break;
            case 0:
                break;
            case 1:
                {
                    ch = stringBuilder[0];
                    break;
                }
            default:
                {
                    ch = stringBuilder[0];
                    break;
                }
        }
        return ch;
    }
    #endregion

#区域“类级别变量”
System.Windows.Threading.Dispatchermer Dispatchermer=
新的System.Windows.Threading.Dispatchermer（）；
字符串actualPwd=“”；
#端区
#区域“窗口事件”
公共窗口2（）
{
初始化组件（）；
}
已加载私有无效窗口2_（对象发送方，路由目标）
{
lblActualPwd.Visibility=Visibility.Hidden；
textBox.Focus（）；
}
#端区
#区域“文本框事件”
私有void文本框_PreviewKeyDown（对象发送方，KeyEventArgs e）
{
if（e.Key！=Key.Back）
{
actualPwd+=GetCharFromKey（e.Key）；//存储实际字符以备以后检索
}
else if（e.Key==Key.Back）
{
如果（实际长度>0）
actualPwd=actualPwd.Remove（actualPwd.Length-1）；
其他的
实际值=”；
}
其他的
{
actualPwd+=GetCharFromKey（e.Key）；
}
字符串str=“”；
for（int i=0；i0）
{
lblActualPwd.Foreground=画笔.Blue；
lblActualPwd.Content=实际值；
lblActualPwd.Visibility=可见性.Visibility；
}
其他的
{
lblActualPwd.Foreground=画笔.Red；
lblActualPwd.Content=“请输入密码。”；
lblActualPwd.Visibility=可见性.Visibility；
}
}
私有无效ckhShowPassword_未选中（对象发送方，路由目标）
{
lblActualPwd.Content=string.Empty；
lblActualPwd.Visibility=Visibility.Hidden；
}
#端区
#区域“枚举类型-将键映射到字符”
公共枚举映射类型：uint
{
MAPVK_VK_TO_VSC=0x0，
MAPVK_VSC_TO_VK=0x1，
MAPVK_VK_TO_CHAR=0x2，
MAPVK_VSC_TO_VK_EX=0x3，
}
#端区
#区域“互操作DLL导入”
[DllImport（“user32.dll”）]
公共静态外部布尔GetKeyboardState（字节[]lpKeyState）；
[DllImport（“user32.dll”）]
公共静态外部uint MapVirtualKey（uint uCode，MapType uMapType）；
[DllImport（“user32.dll”）]
#端区
#区域“虚拟密钥UNICODE转换”
图尼科德公共静态外部设备(
uint wVirtKey，
uint wScanCode，
字节[]lpKeyState，
[Out，marshallas（UnmanagedType.LPWStr，SizeParamIndex=4）]
StringBuilder pwszBuff，
int cchBuff，
uint-wFlags）；
#端区
#区域“函数-键中的字符”
公共静态字符GetCharFromKey（Key-Key）
{
char ch=“”；
int virtualKey=KeyInterop.VirtualKeyFromKey（键）；
字节[]键盘状态=新字节[256]；
GetKeyboardState（keyboardState）；
uint scanCode=MapVirtualKey（（uint）virtualKey，MapType.MAPVK_VK_TO_VSC）；
StringBuilder StringBuilder=新的StringBuilder（2）；
int result=ToUnicode（（uint）virtualKey，扫描码，键盘状态，stringBuilder，stringBuilder.Capacity，0）；
开关（结果）
{
案例1：
打破
案例0：
打破
案例1：
{
ch=stringBuilder[0]；
打破
}
违约：
{
ch=stringBuilder[0]；
打破
}
}
返回ch；
}
#端区

MapType
enum
检索自
我已经实现了类似的功能，这里只是一个简单的示例，passwordbox被tex替换
    <Label x:Name="Pwd" Height="30" Width="70" HorizontalAlignment="Left" FontSize="14"
           Margin="10,10,0,0" VerticalAlignment="Top" Content="Password:"/>
    <TextBox x:Name="textBox" Width="130" Height="30" Margin="30,10,0,0" 
             VerticalAlignment="Top" MaxLength="12" FontSize="14"
             PreviewKeyDown="TextBox_PreviewKeyDown" 
             KeyDown="TextBox_KeyDown" />
    <CheckBox x:Name="ckhShowPassword" Height="30" 
              Content="Show password characters" 
              Margin="69,0,59,42" VerticalAlignment="Bottom" 
              Checked="ckhShowPassword_Checked" Unchecked="ckhShowPassword_UnChecked"/>
    <Label x:Name="lblActualPwd" Height="30" Width="200" 
           Margin="10,100,0,0" VerticalAlignment="Top" FontSize="14"
           HorizontalAlignment="Center" HorizontalContentAlignment="Center"/>

    #region "CLASS LEVEL VARIABLES"
    System.Windows.Threading.DispatcherTimer dispatcherTimer = 
        new System.Windows.Threading.DispatcherTimer();
    string actualPwd = "";
    #endregion

    #region "WINDOW EVENTS"
    public Window2()
    {
        InitializeComponent();
    }

    private void Window2_Loaded(object sender, RoutedEventArgs e)
    {
        lblActualPwd.Visibility = Visibility.Hidden;
        textBox.Focus();
    }
    #endregion

    #region "TEXTBOX EVENTS"
    private void TextBox_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key != Key.Back)
        {
            actualPwd += GetCharFromKey(e.Key); //Store actual characters for later retrieval        
        }
        else if (e.Key == Key.Back)
        {
            if (actualPwd.Length > 0)
                actualPwd = actualPwd.Remove(actualPwd.Length - 1);
            else
                actualPwd = "";
        }
        else
        {
            actualPwd += GetCharFromKey(e.Key);
        }

        string str = "";
        for (int i = 0; i < textBox.Text.Length; i++)
            str += char.ConvertFromUtf32(8226);

        textBox.Text = str;
        textBox.Select(textBox.Text.Length, 0);
    }

    private void TextBox_KeyDown(object sender, KeyEventArgs e)
    {
        dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
        dispatcherTimer.Interval = new TimeSpan(0, 0, 0, 1);
        dispatcherTimer.Start();
    }
    #endregion

    #region "DISPATCHER EVENT"
    private void dispatcherTimer_Tick(object sender, EventArgs e)
    {   
        string str = "";
        for(int i = 0; i < textBox.Text.Length; i++)
            str += char.ConvertFromUtf32(8226);

        textBox.Text = str;
        textBox.Select(textBox.Text.Length, 0);
    }
    #endregion

    #region "CHECKBOX EVENTS"
    private void ckhShowPassword_Checked(object sender, RoutedEventArgs e)
    {
        if (actualPwd.Length > 0)
        {
            lblActualPwd.Foreground = Brushes.Blue;
            lblActualPwd.Content = actualPwd;
            lblActualPwd.Visibility = Visibility.Visible;
        }
        else
        {
            lblActualPwd.Foreground = Brushes.Red;
            lblActualPwd.Content = "Please input password.";
            lblActualPwd.Visibility = Visibility.Visible;
        }
    }

    private void ckhShowPassword_UnChecked(object sender, RoutedEventArgs e)
    {
        lblActualPwd.Content = string.Empty;
        lblActualPwd.Visibility = Visibility.Hidden;
    }
    #endregion

    #region "ENUM TYPE - MAP KEY TO CHARACTER"
    public enum MapType : uint
    {
        MAPVK_VK_TO_VSC = 0x0,
        MAPVK_VSC_TO_VK = 0x1,
        MAPVK_VK_TO_CHAR = 0x2,
        MAPVK_VSC_TO_VK_EX = 0x3,
    }
    #endregion

    #region "INTEROP DLL IMPORT"
    [DllImport("user32.dll")]
    public static extern bool GetKeyboardState(byte[] lpKeyState);
    [DllImport("user32.dll")]
    public static extern uint MapVirtualKey(uint uCode, MapType uMapType);
    [DllImport("user32.dll")]
    #endregion

    #region "VIRTUAL KEY UNICODE CONVERSION"
    public static extern int ToUnicode(
     uint wVirtKey,
     uint wScanCode,
     byte[] lpKeyState,
     [Out, MarshalAs(UnmanagedType.LPWStr, SizeParamIndex = 4)] 
    StringBuilder pwszBuff,
     int cchBuff,
     uint wFlags);
    #endregion

    #region "FUNCTION - CHAR FROM KEY"
    public static char GetCharFromKey(Key key)
    {
        char ch = ' ';

        int virtualKey = KeyInterop.VirtualKeyFromKey(key);
        byte[] keyboardState = new byte[256];
        GetKeyboardState(keyboardState);

        uint scanCode = MapVirtualKey((uint)virtualKey, MapType.MAPVK_VK_TO_VSC);
        StringBuilder stringBuilder = new StringBuilder(2);

        int result = ToUnicode((uint)virtualKey, scanCode, keyboardState, stringBuilder, stringBuilder.Capacity, 0);
        switch (result)
        {
            case -1:
                break;
            case 0:
                break;
            case 1:
                {
                    ch = stringBuilder[0];
                    break;
                }
            default:
                {
                    ch = stringBuilder[0];
                    break;
                }
        }
        return ch;
    }
    #endregion

 <PasswordBox Name="LicencePasswordBox" MouseEnter="LicencePasswordBox_MouseEnter"></PasswordBox>
 <TextBox IsReadOnly="True" Name="LicencePasswordTextBox" MouseLeave="LicencePasswordBox_MouseLeave" Visibility="Hidden"></TextBox>

 private void LicencePasswordBox_MouseEnter(object sender, MouseEventArgs e)
    {
        LicencePasswordBox.Visibility = Visibility.Hidden;
        LicencePasswordTextBox.Visibility = Visibility.Visible;
    }

    private void LicencePasswordBox_MouseLeave(object sender, MouseEventArgs e)
    {
        LicencePasswordBox.Visibility = Visibility.Visible;
        LicencePasswordTextBox.Visibility = Visibility.Hidden;
    }