c# - 当我单击 CheckBox 时，Wpf PasswordBox 必须显示字符

Question

xaml

<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<StackPanel VerticalAlignment="Center" Width="300">
    <PasswordBox x:Name="PasswordBox1" Height="30" PasswordChar="*" Password="12345"/>
    <CheckBox x:Name="CheckBox1" Content="Show Password"/>
</StackPanel>
</Window>

vb.net

Class MainWindow 
Private Sub CheckBox1_Checked(sender As Object, e As RoutedEventArgs) Handles CheckBox1.Checked
    PasswordBox1.PasswordChar = CChar("")
End Sub
Private Sub CheckBox1_Unchecked(sender As Object, e As RoutedEventArgs) Handles CheckBox1.Unchecked
    PasswordBox1.PasswordChar = CChar("*")
End Sub
End Class

运行以上代码并单击 CheckBox1 以了解发生了什么。

当我点击 CheckBox 时，PasswordBox 如何显示 12345 的字符？

因此，需要修复以下行。

PasswordBox1.PasswordChar = CChar(" ")

Answer 1

这将适用于您正在寻找的内容，尽管它会在内存中暴露您的密码。我们在 UI 的同一位置有一个文本框和一个密码框，当用户选中“显示密码”复选框时，我们折叠密码框并显示隐藏的文本框，同时更新文本。发送密码时，您需要检查您是否使用可见 UI 控件中的密码。

Xaml 代码:

<StackPanel Orientation="Horizontal">
  <Grid Width="300" Height="40">
    <PasswordBox Name="passwordBox" PasswordChar="*" />
    <TextBox Name="passwordTxtBox" Visibility="Collapsed" />
  </Grid>
<CheckBox Margin="10" Name="showPassword" Unchecked="ShowPassword_Unchecked"  Checked="ShowPassword_Checked" />
</StackPanel>

代码隐藏:

    private void ShowPassword_Checked(object sender, RoutedEventArgs e)
    {
        passwordTxtBox.Text = passwordBox.Password;
        passwordBox.Visibility = Visibility.Collapsed;
        passwordTxtBox.Visibility = Visibility.Visible;
    }

    private void ShowPassword_Unchecked(object sender, RoutedEventArgs e)
    {
        passwordBox.Password = passwordTxtBox.Text;
        passwordTxtBox.Visibility = Visibility.Collapsed;
        passwordBox.Visibility = Visibility.Visible;
    }